<?xml version="1.0" encoding="us-ascii"?>
<!-- Created by Merrill Corporation -->
<!-- Generated by Fujitsu Interstage XWand B0189 -->
<!--Generated by IRIS XBRL Generation Engine-->
<xsd:schema targetNamespace="http://www.paagp.com/20131231" attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:pagp="http://www.paagp.com/20131231" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:ref="http://www.xbrl.org/2006/ref" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:us-types="http://fasb.org/us-types/2013-01-31" xmlns:xl="http://www.xbrl.org/2003/XLink" xmlns:us-gaap="http://fasb.org/us-gaap/2013-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:country="http://xbrl.sec.gov/country/2013-01-31" xmlns:negated="http://www.xbrl.org/2009/role/negated" xmlns:dei="http://xbrl.sec.gov/dei/2013-01-31" xmlns:attributeFormDefault="unqualified" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrli="http://www.xbrl.org/2003/instance">
  <xsd:annotation>
    <xsd:appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:href="pagp-20131231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="pagp-20131231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="pagp-20131231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:linkbaseRef xlink:type="simple" xlink:href="pagp-20131231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" />
      <link:roleType roleURI="http://www.paagp.com/role/DocumentAndEntityInformation" id="DocumentAndEntityInformation">
        <link:definition>0000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/BalanceSheet" id="BalanceSheet">
        <link:definition>0010 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/BalanceSheetParenthetical" id="BalanceSheetParenthetical">
        <link:definition>0015 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfIncome" id="StatementOfIncome">
        <link:definition>0020 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfIncomeParenthetical" id="StatementOfIncomeParenthetical">
        <link:definition>0025 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfComprehensiveIncome" id="StatementOfComprehensiveIncome">
        <link:definition>0030 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfChangesInAccumulatedOtherComprehensiveIncome" id="StatementOfChangesInAccumulatedOtherComprehensiveIncome">
        <link:definition>0040 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/CashFlows" id="CashFlows">
        <link:definition>0050 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfPartnersCapital" id="StatementOfPartnersCapital">
        <link:definition>0060 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL / MEMBERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOrganizationAndBasisOfPresentation" id="DisclosureOrganizationAndBasisOfPresentation">
        <link:definition>1010 - Disclosure - Organization and Basis of Presentation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPolicies" id="DisclosureSummaryOfSignificantAccountingPolicies">
        <link:definition>1020 - Disclosure - Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAcquisitionsAndDispositions" id="DisclosureAcquisitionsAndDispositions">
        <link:definition>1030 - Disclosure - Acquisitions and Dispositions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureNetIncomePerClassAShare" id="DisclosureNetIncomePerClassAShare">
        <link:definition>1040 - Disclosure - Net Income Per Class A Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureInventoryLinefillAndBaseGasAndLongTermInventory" id="DisclosureInventoryLinefillAndBaseGasAndLongTermInventory">
        <link:definition>1050 - Disclosure - Inventory, Linefill and Base Gas and Long-term Inventory</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePropertyAndEquipment" id="DisclosurePropertyAndEquipment">
        <link:definition>1060 - Disclosure - Property and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureGoodwill" id="DisclosureGoodwill">
        <link:definition>1070 - Disclosure - Goodwill</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOtherAssetsNet" id="DisclosureOtherAssetsNet">
        <link:definition>1080 - Disclosure - Other Assets, Net</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebt" id="DisclosureDebt">
        <link:definition>1090 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributions" id="DisclosurePartnersCapitalAndDistributions">
        <link:definition>1100 - Disclosure - Partners' Capital and Distributions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivities" id="DisclosureDerivativesAndRiskManagementActivities">
        <link:definition>1110 - Disclosure - Derivatives and Risk Management Activities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureIncomeTaxes" id="DisclosureIncomeTaxes">
        <link:definition>1120 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMajorCustomersAndConcentrationOfCreditRisk" id="DisclosureMajorCustomersAndConcentrationOfCreditRisk">
        <link:definition>1130 - Disclosure - Major Customers and Concentration of Credit Risk</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureRelatedPartyTransactions" id="DisclosureRelatedPartyTransactions">
        <link:definition>1140 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlans" id="DisclosureEquityIndexedCompensationPlans">
        <link:definition>1150 - Disclosure - Equity-Indexed Compensation Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingencies" id="DisclosureCommitmentsAndContingencies">
        <link:definition>1160 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureQuarterlyFinancialData" id="DisclosureQuarterlyFinancialData">
        <link:definition>1170 - Disclosure - Quarterly Financial Data (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOperatingSegments" id="DisclosureOperatingSegments">
        <link:definition>1180 - Disclosure - Operating Segments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies" id="DisclosureSummaryOfSignificantAccountingPoliciesPolicies">
        <link:definition>2020 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesTables" id="DisclosureSummaryOfSignificantAccountingPoliciesTables">
        <link:definition>3020 - Disclosure - Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAcquisitionsAndDispositionsTables" id="DisclosureAcquisitionsAndDispositionsTables">
        <link:definition>3030 - Disclosure - Acquisitions and Dispositions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureNetIncomePerClassAShareTables" id="DisclosureNetIncomePerClassAShareTables">
        <link:definition>3040 - Disclosure - Net Income Per Class A Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureInventoryLinefillAndBaseGasAndLongTermInventoryTables" id="DisclosureInventoryLinefillAndBaseGasAndLongTermInventoryTables">
        <link:definition>3050 - Disclosure - Inventory, Linefill and Base Gas and Long-term Inventory (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePropertyAndEquipmentTables" id="DisclosurePropertyAndEquipmentTables">
        <link:definition>3060 - Disclosure - Property and Equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureGoodwillTables" id="DisclosureGoodwillTables">
        <link:definition>3070 - Disclosure - Goodwill (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOtherAssetsNetTables" id="DisclosureOtherAssetsNetTables">
        <link:definition>3080 - Disclosure - Other Assets, Net (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebtTables" id="DisclosureDebtTables">
        <link:definition>3090 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsTables" id="DisclosurePartnersCapitalAndDistributionsTables">
        <link:definition>3100 - Disclosure - Partners' Capital and Distributions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesTables" id="DisclosureDerivativesAndRiskManagementActivitiesTables">
        <link:definition>3110 - Disclosure - Derivatives and Risk Management Activities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureIncomeTaxesTables" id="DisclosureIncomeTaxesTables">
        <link:definition>3120 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureRelatedPartyTransactionsTables" id="DisclosureRelatedPartyTransactionsTables">
        <link:definition>3140 - Disclosure - Related Party Transactions (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlansTables" id="DisclosureEquityIndexedCompensationPlansTables">
        <link:definition>3150 - Disclosure - Equity-Indexed Compensation Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesTables" id="DisclosureCommitmentsAndContingenciesTables">
        <link:definition>3160 - Disclosure - Commitments and Contingencies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureQuarterlyFinancialDataTables" id="DisclosureQuarterlyFinancialDataTables">
        <link:definition>3170 - Disclosure - Quarterly Financial Data (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOperatingSegmentsTables" id="DisclosureOperatingSegmentsTables">
        <link:definition>3180 - Disclosure - Operating Segments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOrganizationAndBasisOfPresentationDetails" id="DisclosureOrganizationAndBasisOfPresentationDetails">
        <link:definition>4010 - Disclosure - Organization and Basis of Presentation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails" id="DisclosureSummaryOfSignificantAccountingPoliciesDetails">
        <link:definition>4020 - Disclosure - Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails2" id="DisclosureSummaryOfSignificantAccountingPoliciesDetails2">
        <link:definition>4021 - Disclosure - Summary of Significant Accounting Policies (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAcquisitionsAndDispositionsDetails" id="DisclosureAcquisitionsAndDispositionsDetails">
        <link:definition>4030 - Disclosure - Acquisitions and Dispositions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAcquisitionsAndDispositionsDetails2" id="DisclosureAcquisitionsAndDispositionsDetails2">
        <link:definition>4031 - Disclosure - Acquisitions and Dispositions (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureNetIncomePerClassAShareDetails" id="DisclosureNetIncomePerClassAShareDetails">
        <link:definition>4040 - Disclosure - Net Income Per Class A Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureInventoryLinefillAndBaseGasAndLongTermInventoryDetails" id="DisclosureInventoryLinefillAndBaseGasAndLongTermInventoryDetails">
        <link:definition>4050 - Disclosure - Inventory, Linefill and Base Gas and Long-term Inventory (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePropertyAndEquipmentDetails" id="DisclosurePropertyAndEquipmentDetails">
        <link:definition>4060 - Disclosure - Property and Equipment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureGoodwillDetails" id="DisclosureGoodwillDetails">
        <link:definition>4070 - Disclosure - Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOtherAssetsNetDetails" id="DisclosureOtherAssetsNetDetails">
        <link:definition>4080 - Disclosure - Other Assets, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOtherAssetsNetDetails2" id="DisclosureOtherAssetsNetDetails2">
        <link:definition>4081 - Disclosure - Other Assets, Net (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebtDetails" id="DisclosureDebtDetails">
        <link:definition>4090 - Disclosure - Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebtDetails2" id="DisclosureDebtDetails2">
        <link:definition>4091 - Disclosure - Debt (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebtDetails3" id="DisclosureDebtDetails3">
        <link:definition>4092 - Disclosure - Debt (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDebtDetails4" id="DisclosureDebtDetails4">
        <link:definition>4093 - Disclosure - Debt (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails" id="DisclosurePartnersCapitalAndDistributionsDetails">
        <link:definition>4100 - Disclosure - Partners' Capital and Distributions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails2" id="DisclosurePartnersCapitalAndDistributionsDetails2">
        <link:definition>4101 - Disclosure - Partners' Capital and Distributions (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails3" id="DisclosurePartnersCapitalAndDistributionsDetails3">
        <link:definition>4102 - Disclosure - Partners' Capital and Distributions (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails4" id="DisclosurePartnersCapitalAndDistributionsDetails4">
        <link:definition>4103 - Disclosure - Partners' Capital and Distributions (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails" id="DisclosureDerivativesAndRiskManagementActivitiesDetails">
        <link:definition>4110 - Disclosure - Derivatives and Risk Management Activities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails2" id="DisclosureDerivativesAndRiskManagementActivitiesDetails2">
        <link:definition>4111 - Disclosure - Derivatives and Risk Management Activities (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails3" id="DisclosureDerivativesAndRiskManagementActivitiesDetails3">
        <link:definition>4112 - Disclosure - Derivatives and Risk Management Activities (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails4" id="DisclosureDerivativesAndRiskManagementActivitiesDetails4">
        <link:definition>4113 - Disclosure - Derivatives and Risk Management Activities (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails5" id="DisclosureDerivativesAndRiskManagementActivitiesDetails5">
        <link:definition>4114 - Disclosure - Derivatives and Risk Management Activities (Details 5)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails6" id="DisclosureDerivativesAndRiskManagementActivitiesDetails6">
        <link:definition>4115 - Disclosure - Derivatives and Risk Management Activities (Details 6)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDerivativesAndRiskManagementActivitiesDetails7" id="DisclosureDerivativesAndRiskManagementActivitiesDetails7">
        <link:definition>4116 - Disclosure - Derivatives and Risk Management Activities (Details 7)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureIncomeTaxesDetails" id="DisclosureIncomeTaxesDetails">
        <link:definition>4120 - Disclosure - Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureIncomeTaxesDetails2" id="DisclosureIncomeTaxesDetails2">
        <link:definition>4121 - Disclosure - Income Taxes (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMajorCustomersAndConcentrationOfCreditRiskDetails" id="DisclosureMajorCustomersAndConcentrationOfCreditRiskDetails">
        <link:definition>4130 - Disclosure - Major Customers and Concentration of Credit Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureRelatedPartyTransactionsDetails" id="DisclosureRelatedPartyTransactionsDetails">
        <link:definition>4140 - Disclosure - Related Party Transactions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlansDetails" id="DisclosureEquityIndexedCompensationPlansDetails">
        <link:definition>4150 - Disclosure - Equity-Indexed Compensation Plans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlansDetails2" id="DisclosureEquityIndexedCompensationPlansDetails2">
        <link:definition>4151 - Disclosure - Equity-Indexed Compensation Plans (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlansDetails3" id="DisclosureEquityIndexedCompensationPlansDetails3">
        <link:definition>4152 - Disclosure - Equity-Indexed Compensation Plans (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityIndexedCompensationPlansDetails4" id="DisclosureEquityIndexedCompensationPlansDetails4">
        <link:definition>4153 - Disclosure - Equity-Indexed Compensation Plans (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails" id="DisclosureCommitmentsAndContingenciesDetails">
        <link:definition>4160 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails2" id="DisclosureCommitmentsAndContingenciesDetails2">
        <link:definition>4161 - Disclosure - Commitments and Contingencies (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails3" id="DisclosureCommitmentsAndContingenciesDetails3">
        <link:definition>4162 - Disclosure - Commitments and Contingencies (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetailsCalc2" id="DisclosureCommitmentsAndContingenciesDetailsCalc2">
        <link:definition>4163 - Disclosure - Commitments and Contingencies (Details) (Calc 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureQuarterlyFinancialDataDetails" id="DisclosureQuarterlyFinancialDataDetails">
        <link:definition>4170 - Disclosure - Quarterly Financial Data (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOperatingSegmentsDetails" id="DisclosureOperatingSegmentsDetails">
        <link:definition>4180 - Disclosure - Operating Segments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOperatingSegmentsDetails2" id="DisclosureOperatingSegmentsDetails2">
        <link:definition>4181 - Disclosure - Operating Segments (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOperatingSegmentsDetails3" id="DisclosureOperatingSegmentsDetails3">
        <link:definition>4182 - Disclosure - Operating Segments (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureOrganizationAndBasisOfPresentationDetails2" id="DisclosureOrganizationAndBasisOfPresentationDetails2">
        <link:definition>8000 - Disclosure - Organization and Basis of Presentation (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAcquisitions" id="DisclosureAcquisitions">
        <link:definition>8010 - Disclosure - Acquisitions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAccountsReceivableDetails" id="DisclosureAccountsReceivableDetails">
        <link:definition>8020 - Disclosure - Accounts Receivable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureAccountsReceivable" id="DisclosureAccountsReceivable">
        <link:definition>8030 - Disclosure - Accounts Receivable</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails4" id="DisclosureCommitmentsAndContingenciesDetails4">
        <link:definition>8040 - Disclosure - Commitments and Contingencies (Details 4)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSubsequentEvents" id="DisclosureSubsequentEvents">
        <link:definition>8050 - Disclosure - Subsequent Events</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSubsequentEventsDetails" id="DisclosureSubsequentEventsDetails">
        <link:definition>8060 - Disclosure - Subsequent Events (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails13" id="DisclosurePartnersCapitalAndDistributionsDetails13">
        <link:definition>8070 - Disclosure - Partners' Capital and Distributions (Details 13)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureEquityCompensationPlansDetails5" id="DisclosureEquityCompensationPlansDetails5">
        <link:definition>8080 - Disclosure - Equity Compensation Plans (Details 5)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails8" id="DisclosureSummaryOfSignificantAccountingPoliciesDetails8">
        <link:definition>8090 - Disclosure - Summary of Significant Accounting Policies (Details 8)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails9" id="DisclosureSummaryOfSignificantAccountingPoliciesDetails9">
        <link:definition>8100 - Disclosure - Summary of Significant Accounting Policies (Details 9)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureImpairments" id="DisclosureImpairments">
        <link:definition>8110 - Disclosure - Impairments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureImpairmentsDetails" id="DisclosureImpairmentsDetails">
        <link:definition>8120 - Disclosure - Impairments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMembersEquity" id="DisclosureMembersEquity">
        <link:definition>8130 - Disclosure - Members' Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureDispositions" id="DisclosureDispositions">
        <link:definition>8140 - Disclosure - Dispositions</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails5" id="DisclosureCommitmentsAndContingenciesDetails5">
        <link:definition>8150 - Disclosure - Commitments and Contingencies (Details 5)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureCommitmentsAndContingenciesDetails8" id="DisclosureCommitmentsAndContingenciesDetails8">
        <link:definition>8160 - Disclosure - Commitments and Contingencies (Details 8)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/StatementOfIncomeCalc2" id="StatementOfIncomeCalc2">
        <link:definition>8170 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (CALC 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureNetIncomePerLimitedPartnerUnitDetails3" id="DisclosureNetIncomePerLimitedPartnerUnitDetails3">
        <link:definition>8180 - Disclosure - Net Income Per Limited Partner Unit (Details 3)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureNetIncomePerLimitedPartnerUnitDetails2" id="DisclosureNetIncomePerLimitedPartnerUnitDetails2">
        <link:definition>8190 - Disclosure - Net Income Per Limited Partner Unit (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMembersEquityDetails2" id="DisclosureMembersEquityDetails2">
        <link:definition>8200 - Disclosure - Members' Equity (Details 2)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMembersEquityDetails" id="DisclosureMembersEquityDetails">
        <link:definition>8210 - Disclosure - Members' Equity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureMembersEquityTables" id="DisclosureMembersEquityTables">
        <link:definition>8220 - Disclosure - Members' Equity (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosureRecentAccountingPronouncements" id="DisclosureRecentAccountingPronouncements">
        <link:definition>8230 - Disclosure - Recent Accounting Pronouncements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails11" id="DisclosurePartnersCapitalAndDistributionsDetails11">
        <link:definition>8240 - Disclosure - Partners' Capital and Distributions (Details 11)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails12" id="DisclosurePartnersCapitalAndDistributionsDetails12">
        <link:definition>8250 - Disclosure - Partners' Capital and Distributions (Details 12)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails14" id="DisclosurePartnersCapitalAndDistributionsDetails14">
        <link:definition>8260 - Disclosure - Partners' Capital and Distributions (Details 14)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails15" id="DisclosurePartnersCapitalAndDistributionsDetails15">
        <link:definition>8270 - Disclosure - Partners' Capital and Distributions (Details 15)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails16" id="DisclosurePartnersCapitalAndDistributionsDetails16">
        <link:definition>8280 - Disclosure - Partners' Capital and Distributions (Details 16)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails17" id="DisclosurePartnersCapitalAndDistributionsDetails17">
        <link:definition>8290 - Disclosure - Partners' Capital and Distributions (Details 17)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails6" id="DisclosurePartnersCapitalAndDistributionsDetails6">
        <link:definition>8300 - Disclosure - Partners' Capital and Distributions (Details 6)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails7" id="DisclosurePartnersCapitalAndDistributionsDetails7">
        <link:definition>8310 - Disclosure - Partners' Capital and Distributions (Details 7)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails8" id="DisclosurePartnersCapitalAndDistributionsDetails8">
        <link:definition>8320 - Disclosure - Partners' Capital and Distributions (Details 8)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.paagp.com/role/DisclosurePartnersCapitalAndDistributionsDetails5" id="DisclosurePartnersCapitalAndDistributionsDetails5">
        <link:definition>8330 - Disclosure - Partners' Capital and Distributions (Details 5)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xsd:appinfo>
  </xsd:annotation>
  <xsd:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2009/role/negated" schemaLocation="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/dei/2013-01-31" schemaLocation="http://xbrl.sec.gov/dei/2013/dei-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/invest/2013-01-31" schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-gaap/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-gaap-2013-01-31.xsd" />
  <xsd:import namespace="http://fasb.org/us-types/2013-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2013/elts/us-types-2013-01-31.xsd" />
  <xsd:import namespace="http://xbrl.sec.gov/country/2013-01-31" schemaLocation="http://xbrl.sec.gov/country/2013/country-2013-01-31.xsd" />
  <xsd:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <xsd:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <xsd:element name="ReductionInIncentiveDistributionsPerQuarterIn2016" id="pagp_ReductionInIncentiveDistributionsPerQuarterIn2016" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionInIncentiveDistributionsPerQuarterAfter2016" id="pagp_ReductionInIncentiveDistributionsPerQuarterAfter2016" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="SeniorNotesDueInJanuary2017At6.13PercentMember" id="pagp_SeniorNotesDueInJanuary2017At6.13PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInMay2018At6.50PercentMember" id="pagp_SeniorNotesDueInMay2018At6.50PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInMay2019At8.75PercentMember" id="pagp_SeniorNotesDueInMay2019At8.75PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJanuary2020At5.75PercentMember" id="pagp_SeniorNotesDueInJanuary2020At5.75PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInMay2036At6.70PercentMember" id="pagp_SeniorNotesDueInMay2036At6.70PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJanuary2037At6.65PercentMember" id="pagp_SeniorNotesDueInJanuary2037At6.65PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AAPTermLoanMember" id="pagp_AAPTermLoanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AAPRevolvingCreditFacilityMember" id="pagp_AAPRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionMadeToLimitedPartnerPeriodConsideredForProRataDistributions" id="pagp_DistributionMadeToLimitedPartnerPeriodConsideredForProRataDistributions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AmortizationExpenseOnOtherAssetsNoncurrent" id="pagp_AmortizationExpenseOnOtherAssetsNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SixForwardStartingThirtyYearInterestRateSwapMember" id="pagp_SixForwardStartingThirtyYearInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourForwardStartingTenYearInterestRateSwapMember" id="pagp_FourForwardStartingTenYearInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LinefillAndBaseGasVolumetricRatioOfMcfOfNaturalGasToBtuMinimum" id="pagp_LinefillAndBaseGasVolumetricRatioOfMcfOfNaturalGasToBtuMinimum" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ConversionNaturalGasToCrudeBarrelsDivisor" id="pagp_ConversionNaturalGasToCrudeBarrelsDivisor" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="SeniorNotesDueInJanuary2023At2.85PercentMember" id="pagp_SeniorNotesDueInJanuary2023At2.85PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJanuary2043At4.30PercentMember" id="pagp_SeniorNotesDueInJanuary2043At4.30PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJune2022At3.65PercentMember" id="pagp_SeniorNotesDueInJune2022At3.65PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJune2042At5.15PercentMember" id="pagp_SeniorNotesDueInJune2042At5.15PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInFebruary2021At5.00PercentMember" id="pagp_SeniorNotesDueInFebruary2021At5.00PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInSeptember2015At3.95PercentMember" id="pagp_SeniorNotesDueInSeptember2015At3.95PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInSeptember2012At4.25PercentMember" id="pagp_SeniorNotesDueInSeptember2012At4.25PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueIn2012At7.75PercentMember" id="pagp_SeniorNotesDueIn2012At7.75PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastScheduledInvoiceDate" id="pagp_AccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastScheduledInvoiceDate" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccumulatedAmortizationOfOtherAssetsNoncurrent" id="pagp_AccumulatedAmortizationOfOtherAssetsNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AcquisitionMeasurementPeriodThreshold" id="pagp_AcquisitionMeasurementPeriodThreshold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionPeriod" id="pagp_AcquisitionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionPurchasePriceAllocationNoncurrentAssets" id="pagp_AcquisitionPurchasePriceAllocationNoncurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AcquisitionRelatedEnvironmentalRemediationCostsAmountAboveWhichSellingCompanyIsResponsible" id="pagp_AcquisitionRelatedEnvironmentalRemediationCostsAmountAboveWhichSellingCompanyIsResponsible" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionsIn2010Member" id="pagp_AcquisitionsIn2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionsIn2011Member" id="pagp_AcquisitionsIn2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionsIn2012Member" id="pagp_AcquisitionsIn2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AdministrativeAgreementAnnualFeePayable" id="pagp_AdministrativeAgreementAnnualFeePayable" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="AnnualizedDistributionLevelFour" id="pagp_AnnualizedDistributionLevelFour" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionLevelOne" id="pagp_AnnualizedDistributionLevelOne" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionLevelThree" id="pagp_AnnualizedDistributionLevelThree" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionLevelTwo" id="pagp_AnnualizedDistributionLevelTwo" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionThresholdForVestingOfDistributionEquivalentRightsAssociatedWithAwards" id="pagp_AnnualizedDistributionThresholdForVestingOfDistributionEquivalentRightsAssociatedWithAwards" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionThresholdIncreaseNumberOfTranches" id="pagp_AnnualizedDistributionThresholdIncreaseNumberOfTranches" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedVestingDistributionOtherRangeMember" id="pagp_AnnualizedVestingDistributionOtherRangeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AreaOfSiteAffectedDueToCrudeOilRelease" id="pagp_AreaOfSiteAffectedDueToCrudeOilRelease" type="num:areaItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetImpairmentChargesLineItems" id="pagp_AssetImpairmentChargesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetImpairmentChargesTable" id="pagp_AssetImpairmentChargesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AverageCrudeOilBasisLLSAndWTISwapsDifferentialHedgesMember" id="pagp_AverageCrudeOilBasisLLSAndWTISwapsDifferentialHedgesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AwardsWithAMinimumVestingDateOfAugust2016Member" id="pagp_AwardsWithAMinimumVestingDateOfAugust2016Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AwardsWithAMinimumVestingDateOfAugust2017Member" id="pagp_AwardsWithAMinimumVestingDateOfAugust2017Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AwardsWithAMinimumVestingDateOfAugust2018Member" id="pagp_AwardsWithAMinimumVestingDateOfAugust2018Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AwardsWithVestingDateAugust2018Member" id="pagp_AwardsWithVestingDateAugust2018Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AwardsWithVestingDateAugust2019Member" id="pagp_AwardsWithVestingDateAugust2019Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BPNGLAcquisitionMember" id="pagp_BPNGLAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasicAndDilutedEarningsPerLimitedPartnerUnitAxis" id="pagp_BasicAndDilutedEarningsPerLimitedPartnerUnitAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasicAndDilutedEarningsPerLimitedPartnerUnitDomain" id="pagp_BasicAndDilutedEarningsPerLimitedPartnerUnitDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasicAndDilutedEarningsPerShareLineItems" id="pagp_BasicAndDilutedEarningsPerShareLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BasicNetIncomePerLimitedPartnerUnitMember" id="pagp_BasicNetIncomePerLimitedPartnerUnitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BayAreaAirQualityManagementDistrictMember" id="pagp_BayAreaAirQualityManagementDistrictMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BaySpringsPipelineMember" id="pagp_BaySpringsPipelineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionAggregateCapacityOfCrudeOilRailTerminalsAcquired" id="pagp_BusinessAcquisitionAggregateCapacityOfCrudeOilRailTerminalsAcquired" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionAggregateCapacityOfFractionationPlantsAcquired" id="pagp_BusinessAcquisitionAggregateCapacityOfFractionationPlantsAcquired" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionAggregateCapacityOfStraddleAndFieldGasProcessingPlantsAcquired" id="pagp_BusinessAcquisitionAggregateCapacityOfStraddleAndFieldGasProcessingPlantsAcquired" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionContractualRightsRelatedToNGLPipelinesAcquired" id="pagp_BusinessAcquisitionContractualRightsRelatedToNGLPipelinesAcquired" type="num:lengthItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNetOfCashAndOtherWorkingCapitalAcquired" id="pagp_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceNetOfCashAndOtherWorkingCapitalAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionDiameterOfPipelinesAcquired" id="pagp_BusinessAcquisitionDiameterOfPipelinesAcquired" type="num:lengthItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionInventoryVolumes" id="pagp_BusinessAcquisitionInventoryVolumes" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionLongTermAndSeasonalInventoriesAcquired" id="pagp_BusinessAcquisitionLongTermAndSeasonalInventoriesAcquired" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNGLStorageCapacityAcquired" id="pagp_BusinessAcquisitionNGLStorageCapacityAcquired" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfFieldGasProcessingPlantsAcquired" id="pagp_BusinessAcquisitionNumberOfFieldGasProcessingPlantsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfFractionationPlantsAcquired" id="pagp_BusinessAcquisitionNumberOfFractionationPlantsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfOperatingCrudeOilRailTerminalsAcquired" id="pagp_BusinessAcquisitionNumberOfOperatingCrudeOilRailTerminalsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfRailCarsUnderLongTermLeasesAcquired" id="pagp_BusinessAcquisitionNumberOfRailCarsUnderLongTermLeasesAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfStraddlePlantsAcquired" id="pagp_BusinessAcquisitionNumberOfStraddlePlantsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfTerminalsUnderDevelopmentAcquired" id="pagp_BusinessAcquisitionNumberOfTerminalsUnderDevelopmentAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionNumberOfTransactionsCompleted" id="pagp_BusinessAcquisitionNumberOfTransactionsCompleted" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionNumberOfTruckTerminalsAcquired" id="pagp_BusinessAcquisitionNumberOfTruckTerminalsAcquired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPipelinesAcquired" id="pagp_BusinessAcquisitionPipelinesAcquired" type="num:lengthItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionProceedsFromIssuanceOfCommonUnitsAndSeniorNotesUsedToPreFundAcquisition" id="pagp_BusinessAcquisitionProceedsFromIssuanceOfCommonUnitsAndSeniorNotesUsedToPreFundAcquisition" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAdjustmentAmountReceived" id="pagp_BusinessAcquisitionPurchasePriceAdjustmentAmountReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBaseGas" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBaseGas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationContractIncludedInAmortizableIntangibleAssets" id="pagp_BusinessAcquisitionPurchasePriceAllocationContractIncludedInAmortizableIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEnvironmentalLiability" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEnvironmentalLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationImputedInterest" id="pagp_BusinessAcquisitionPurchasePriceAllocationImputedInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationInventoryAndOtherWorkingCapital" id="pagp_BusinessAcquisitionPurchasePriceAllocationInventoryAndOtherWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLinefill" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLinefill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermInventory" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLongTermInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherWorkingCapitalIncludingCashAcquired" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherWorkingCapitalIncludingCashAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherWorkingCapitalNetOfCashAcquired" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherWorkingCapitalNetOfCashAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationOtherWorkingCapitalNetOfCashAcquired" id="pagp_BusinessAcquisitionPurchasePriceAllocationOtherWorkingCapitalNetOfCashAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceAllocationTaxAbatementIncludedInAmortizableIntangibleAssets" id="pagp_BusinessAcquisitionPurchasePriceAllocationTaxAbatementIncludedInAmortizableIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceEscrowed" id="pagp_BusinessAcquisitionPurchasePriceEscrowed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionPurchasePriceEscrowedPercentage" id="pagp_BusinessAcquisitionPurchasePriceEscrowedPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionThroughputCapacityOfThirdPartyStraddlePlantLongTermContractAcquired" id="pagp_BusinessAcquisitionThroughputCapacityOfThirdPartyStraddlePlantLongTermContractAcquired" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessAcquisitionsProFormaNetIncomeLossAllocatedToLimitedPartners" id="pagp_BusinessAcquisitionsProFormaNetIncomeLossAllocatedToLimitedPartners" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommonUnitsOfParentIssuableByRightToReceivePerShareOfSubsidiaryOwned" id="pagp_NumberOfCommonUnitsOfParentIssuableByRightToReceivePerShareOfSubsidiaryOwned" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShortButanePositionContractsRelatedToSubsequentSaleOfProductMember" id="pagp_ShortButanePositionContractsRelatedToSubsequentSaleOfProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ButtePipelineCompanyMember" id="pagp_ButtePipelineCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CanadianSeniorUnsecuredRevolvingCreditFacilityMember" id="pagp_CanadianSeniorUnsecuredRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CapitalExpendituresRelatedToAssetsAcquired" id="pagp_CapitalExpendituresRelatedToAssetsAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="CaplineAndAssociatedTankageMember" id="pagp_CaplineAndAssociatedTankageMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalCasesFiledNumber" id="pagp_TotalCasesFiledNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CasesFiledNumberDuringPeriod" id="pagp_CasesFiledNumberDuringPeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CashFlowHedgeGainLossToBeReclassifiedInYearTwoAndThree" id="pagp_CashFlowHedgeGainLossToBeReclassifiedInYearTwoAndThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CashFlowHedgeGainLossToBeReclassifiedRemainingPortion" id="pagp_CashFlowHedgeGainLossToBeReclassifiedRemainingPortion" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CashPaidRelatedToPurchasesOfLinefillAndBaseGas" id="pagp_CashPaidRelatedToPurchasesOfLinefillAndBaseGas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CashReceivedRelatedToSalesOfLinefillAndBaseGas" id="pagp_CashReceivedRelatedToSalesOfLinefillAndBaseGas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ChangeInAccountingEstimateOfDepreciableLivesIncrementalDepreciationExpenseReduction" id="pagp_ChangeInAccountingEstimateOfDepreciableLivesIncrementalDepreciationExpenseReduction" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AAPManagementUnitActivityRollForward" id="pagp_AAPManagementUnitActivityRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommissionPaidToSalesAgent" id="pagp_CommissionPaidToSalesAgent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CommonUnitAndSeriesASubordinatedUnitMember" id="pagp_CommonUnitAndSeriesASubordinatedUnitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonUnitsMember" id="pagp_CommonUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" id="pagp_ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConocoPhillipsCompanyMember" id="pagp_ConocoPhillipsCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentSharesIssuedOrIssuable" id="pagp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentSharesIssuedOrIssuable" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfModificationNetTableTextBlock" id="pagp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestEffectsOfModificationNetTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitToCommonUnitsTerms" id="pagp_ConversionOfSubordinatedUnitToCommonUnitsTerms" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitsNumberOfConsecutiveQuartersOfDistributionRequired" id="pagp_ConversionOfSubordinatedUnitsNumberOfConsecutiveQuartersOfDistributionRequired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitsNumberOfConsecutiveQuartersOfDistributionSufficiencyRequired" id="pagp_ConversionOfSubordinatedUnitsNumberOfConsecutiveQuartersOfDistributionSufficiencyRequired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitsNumberOfConsecutiveYearsOfReachingRequiredThresholds" id="pagp_ConversionOfSubordinatedUnitsNumberOfConsecutiveYearsOfReachingRequiredThresholds" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitsNumberOfNonOverlappingQuartersOfDistributionAndEarningsThresholdsRequired" id="pagp_ConversionOfSubordinatedUnitsNumberOfNonOverlappingQuartersOfDistributionAndEarningsThresholdsRequired" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConversionOfSubordinatedUnitsNumberOfUnitsToBeConverted" id="pagp_ConversionOfSubordinatedUnitsNumberOfUnitsToBeConverted" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CreditExtensionPeriod" id="pagp_CreditExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CrudeOilAndCondensatePipelineMiles" id="pagp_CrudeOilAndCondensatePipelineMiles" type="num:lengthItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ButaneWTISpreadPositionsMember" id="pagp_ButaneWTISpreadPositionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CrudeOilBasisDifferentialHedgesMember" id="pagp_CrudeOilBasisDifferentialHedgesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CrudeOilBasisLLSAndWTISwapsDifferentialHedgesMember" id="pagp_CrudeOilBasisLLSAndWTISwapsDifferentialHedgesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PipelineLossAllowanceCrudeOilContractNetShortPositionMember" id="pagp_PipelineLossAllowanceCrudeOilContractNetShortPositionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PipelineLossAllowanceCrudeOilLongCallOptionMember" id="pagp_PipelineLossAllowanceCrudeOilLongCallOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CrudeOilFuturesAndSwapsLongPutOptionMember" id="pagp_CrudeOilFuturesAndSwapsLongPutOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCoverageRatioDebtToEBITDAMaximum" id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAMaximum" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCoverageRatioEBITDAToInterestMinimum" id="pagp_DebtInstrumentCoverageRatioEBITDAToInterestMinimum" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DenominatorForBasicAndDilutedEarningsPerLimitedPartnerUnitAbstract" id="pagp_DenominatorForBasicAndDilutedEarningsPerLimitedPartnerUnitAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DepreciationDepletionAmortizationAndImpairment" id="pagp_DepreciationDepletionAmortizationAndImpairment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DilutedNetIncomePerLimitedPartnerUnitMember" id="pagp_DilutedNetIncomePerLimitedPartnerUnitMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionEquivalentRightPayments" id="pagp_DistributionEquivalentRightPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DistributionEquivalentRightsCashPayments" id="pagp_DistributionEquivalentRightsCashPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DistributionMadeToMemberOrLimitedPartnerPerUnitOverMinimumDistributionLevel" id="pagp_DistributionMadeToMemberOrLimitedPartnerPerUnitOverMinimumDistributionLevel" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionThresholdForParticipationInDistributions" id="pagp_DistributionThresholdForParticipationInDistributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DistributionVestingThresholdOneMember" id="pagp_DistributionVestingThresholdOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionVestingThresholdThreeMember" id="pagp_DistributionVestingThresholdThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionVestingThresholdTwoMember" id="pagp_DistributionVestingThresholdTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionsAndExcessOverMinimumQuarterlyDistributionDomain" id="pagp_DistributionsAndExcessOverMinimumQuarterlyDistributionDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionsAndExcessOverMinimumQuarterlyDistributionsAxis" id="pagp_DistributionsAndExcessOverMinimumQuarterlyDistributionsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DocumentEntityInformationAbstract" id="pagp_DocumentEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EPARequestForInformationNumberOfTruckTerminals" id="pagp_EPARequestForInformationNumberOfTruckTerminals" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EagleFordBakkenAndNiobraraMember" id="pagp_EagleFordBakkenAndNiobraraMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmissionReductionCreditsMember" id="pagp_EmissionReductionCreditsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EmployeesAndDirectorsLongTermIncentivePlanMember" id="pagp_EmployeesAndDirectorsLongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EnvironmentalLossContingencyEstimateOfTotalCostsExcludingLostRevenue" id="pagp_EnvironmentalLossContingencyEstimateOfTotalCostsExcludingLostRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EnvironmentalLossContingencyEstimateOfTotalCostsIncludingLostRevenue" id="pagp_EnvironmentalLossContingencyEstimateOfTotalCostsIncludingLostRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EnvironmentalRemediationCashExpendituresPeriodInYears" id="pagp_EnvironmentalRemediationCashExpendituresPeriodInYears" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EnvironmentalRemediationCostsBusinessSellerShare" id="pagp_EnvironmentalRemediationCostsBusinessSellerShare" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityAwardsMember" id="pagp_EquityAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationPlanClassBPolicyTextBlock" id="pagp_EquityBasedCompensationPlanClassBPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationPlanClassBUnitsOfPlainsAAPLPMember" id="pagp_EquityBasedCompensationPlanClassBUnitsOfPlainsAAPLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstimatedPotentialCostOfEnvironmentalRemediation" id="pagp_EstimatedPotentialCostOfEnvironmentalRemediation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="EstimatedPotentialCostOfEnvironmentalRemediationAllocated" id="pagp_EstimatedPotentialCostOfEnvironmentalRemediationAllocated" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="EstimatedSizeOfRelease" id="pagp_EstimatedSizeOfRelease" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EstimatedVolumeOfCrudeOilReleased" id="pagp_EstimatedVolumeOfCrudeOilReleased" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExpenseForWithholdingTaxes" id="pagp_ExpenseForWithholdingTaxes" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" id="pagp_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesDerivativeEnteredInto" id="pagp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesDerivativeEnteredInto" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeNetAssetLiabilityGainLossIncludedInEarningsPeriodIncreaseDecrease" id="pagp_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeNetAssetLiabilityGainLossIncludedInEarningsPeriodIncreaseDecrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" id="pagp_FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FieldOperatingSegmentMember" id="pagp_FieldOperatingSegmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FiveForwardStartingThirtyYearInterestRateSwapMember" id="pagp_FiveForwardStartingThirtyYearInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FixedRateSeniorNotesMember" id="pagp_FixedRateSeniorNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignDeferredTaxExpensesBenefitOnBookVersusTaxDifferences" id="pagp_ForeignDeferredTaxExpensesBenefitOnBookVersusTaxDifferences" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.03MaturingIn2013Member" id="pagp_ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.03MaturingIn2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.03Member" id="pagp_ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.03Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.04MaturingIn2014Member" id="pagp_ForeignExchangeForwardContractThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.04MaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.06MaturingIn2015Member" id="pagp_ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.06MaturingIn2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03MaturingIn2013Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03MaturingIn2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03MaturingIn2014Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03MaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.03Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.04MaturingIn2015Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.04MaturingIn2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsMaturingIn2013Member" id="pagp_ForeignExchangeForwardContractsMaturingIn2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate" id="pagp_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ForeignPeriodTaxOnBookVersusTaxDifferences" id="pagp_ForeignPeriodTaxOnBookVersusTaxDifferences" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ForeignPeriodTaxOnPermanentBookVersusTaxDifferences" id="pagp_ForeignPeriodTaxOnPermanentBookVersusTaxDifferences" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ForeignTaxRate" id="pagp_ForeignTaxRate" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForwardStartingInterestRateSwapMember" id="pagp_ForwardStartingInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FrontierPipelineCompanyMember" id="pagp_FrontierPipelineCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainLossOnForeignCurrencyCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncome" id="pagp_GainLossOnForeignCurrencyCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="GainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncome" id="pagp_GainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="GainLossOnSaleOfLinefillAndBaseGas" id="pagp_GainLossOnSaleOfLinefillAndBaseGas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="GardendaleGatheringSystemAcquisitionMember" id="pagp_GardendaleGatheringSystemAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelOneMember" id="pagp_PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelThreeMember" id="pagp_PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelFourMember" id="pagp_PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelTwoMember" id="pagp_PlainsAllAmericanPipelineLPGeneralPartnerDistributionLevelTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerExpensePolicyTextBlock" id="pagp_GeneralPartnerExpensePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings" id="pagp_GeneralPartnerIncentiveDistributionPaidOrToBePaidBasedOnCurrentPeriodEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerDistributionIncludingIncentiveDistributionPercentage" id="pagp_GeneralPartnerDistributionIncludingIncentiveDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerDistributionPercentage" id="pagp_GeneralPartnerDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerIncentiveDistributionThreshold" id="pagp_GeneralPartnerIncentiveDistributionThreshold" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution" id="pagp_GeneralPartnerOwnershipInterestInNetIncomeLossAfterIncentiveDistribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="GoodwillPurchasePriceAccountingAndOtherAdjustments" id="pagp_GoodwillPurchasePriceAccountingAndOtherAdjustments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="GrantDateFairValueOfOutstandingClassBUnitsRollForward" id="pagp_GrantDateFairValueOfOutstandingClassBUnitsRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="HedgedTransactionsProbableOfNotOccurringMember" id="pagp_HedgedTransactionsProbableOfNotOccurringMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IPOSaleOfStockNumberOfSharesIssuedAtClosingOverAllotmentOption" id="pagp_IPOSaleOfStockNumberOfSharesIssuedAtClosingOverAllotmentOption" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InactiveSeniorUnsecuredRevolvingCreditFacilityMaturingIn2012Member" id="pagp_InactiveSeniorUnsecuredRevolvingCreditFacilityMaturingIn2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InactiveThreeHundredSixtyFourDaySeniorUnsecuredCreditFacilityMember" id="pagp_InactiveThreeHundredSixtyFourDaySeniorUnsecuredCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeNotSubjectToForeignTax" id="pagp_IncomeNotSubjectToForeignTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncomeSubjectToForeignTax" id="pagp_IncomeSubjectToForeignTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInAccumulatedOtherComprehensiveIncomeRollForward" id="pagp_IncreaseDecreaseInAccumulatedOtherComprehensiveIncomeRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInNetDeferredTaxLiability" id="pagp_IncreaseDecreaseInNetDeferredTaxLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IndirectOwnershipInterestInEntityMember" id="pagp_IndirectOwnershipInterestInEntityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InterestExpenseHedgedInventory" id="pagp_InterestExpenseHedgedInventory" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="InventoryByCategoryAbstract" id="pagp_InventoryByCategoryAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InventoryCurrentAndNoncurrent" id="pagp_InventoryCurrentAndNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InventoryRelatedDisclosuresAbstract" id="pagp_InventoryRelatedDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InventoryTable" id="pagp_InventoryTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InventoryVolumesCurrent" id="pagp_InventoryVolumesCurrent" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="InventoryVolumesLinefillAndBaseGas" id="pagp_InventoryVolumesLinefillAndBaseGas" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="InventoryVolumesNoncurrent" id="pagp_InventoryVolumesNoncurrent" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="InventoryWeightedAveragePricePerUnitCurrent" id="pagp_InventoryWeightedAveragePricePerUnitCurrent" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="InventoryWeightedAveragePricePerUnitLinefillAndBaseGas" id="pagp_InventoryWeightedAveragePricePerUnitLinefillAndBaseGas" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="InventoryWeightedAveragePricePerUnitNoncurrent" id="pagp_InventoryWeightedAveragePricePerUnitNoncurrent" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="KempRiverPipelineReleaseMember" id="pagp_KempRiverPipelineReleaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LandAndOtherMember" id="pagp_LandAndOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LengthOfPipelineIsolatedAndDepressurized" id="pagp_LengthOfPipelineIsolatedAndDepressurized" type="num:lengthItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LiabilitiesForOutstandingChecks" id="pagp_LiabilitiesForOutstandingChecks" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LiabilityAwardsMember" id="pagp_LiabilityAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LimitedPartnersUnitPricePerUnit" id="pagp_LimitedPartnersUnitPricePerUnit" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditAndCommercialPaperMember" id="pagp_LineOfCreditAndCommercialPaperMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AAPSeniorSecuredCreditAgreementMember" id="pagp_AAPSeniorSecuredCreditAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LinefillAndBaseGas" id="pagp_LinefillAndBaseGas" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="LongPositionOnNaturalGasContractsMember" id="pagp_LongPositionOnNaturalGasContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongPowerPositionForPowerSupplyRequirementsContractsMember" id="pagp_LongPowerPositionForPowerSupplyRequirementsContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermDebtWeightedAverageLife" id="pagp_LongTermDebtWeightedAverageLife" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermIncentivePlanMember" id="pagp_LongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermIncentivePlansMember" id="pagp_LongTermIncentivePlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LongTermObligationsExcludedFromCalculationOfMaturities" id="pagp_LongTermObligationsExcludedFromCalculationOfMaturities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LossContingencyCommitmentForEnvironmentProject" id="pagp_LossContingencyCommitmentForEnvironmentProject" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LossContingencyPenaltyOrFineAssessed" id="pagp_LossContingencyPenaltyOrFineAssessed" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LossContingencyProvisionForPenaltyPaid" id="pagp_LossContingencyProvisionForPenaltyPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MaintenanceCapital" id="pagp_MaintenanceCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="MarathonPetroleumCorporationMember" id="pagp_MarathonPetroleumCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaturityDateExtensionPeriod" id="pagp_MaturityDateExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumAggregateCommonStockOfferPrice" id="pagp_MaximumAggregateCommonStockOfferPrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="MaximumPercentageParticipationForDistributionInExcessOfThreshold" id="pagp_MaximumPercentageParticipationForDistributionInExcessOfThreshold" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="May2012ContinuousOfferingProgramMember" id="pagp_May2012ContinuousOfferingProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MembersEquityLineItems" id="pagp_MembersEquityLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MembersEquityTable" id="pagp_MembersEquityTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumWorkingGasStorageCapacity" id="pagp_MinimumWorkingGasStorageCapacity" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MinorityInterestOwnershipSharesHeldByNoncontrollingOwners" id="pagp_MinorityInterestOwnershipSharesHeldByNoncontrollingOwners" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="MississippiBusinessFinanceCorporationGulfOpportunityZoneIndustrialDevelopmentRevenueBondsSeries2009Member" id="pagp_MississippiBusinessFinanceCorporationGulfOpportunityZoneIndustrialDevelopmentRevenueBondsSeries2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MississippiBusinessFinanceCorporationGulfOpportunityZoneIndustrialDevelopmentRevenueBondsSeries2010Member" id="pagp_MississippiBusinessFinanceCorporationGulfOpportunityZoneIndustrialDevelopmentRevenueBondsSeries2010Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ModificationOfHoldingsByTrancheAxis" id="pagp_ModificationOfHoldingsByTrancheAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ModificationOfHoldingsByTrancheDomain" id="pagp_ModificationOfHoldingsByTrancheDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ModificationOfHoldingsUnitsModified" id="pagp_ModificationOfHoldingsUnitsModified" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ModificationOfHoldingsUnitsPostModification" id="pagp_ModificationOfHoldingsUnitsPostModification" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ModificationOfHoldingsUnitsPriorToModification" id="pagp_ModificationOfHoldingsUnitsPriorToModification" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NGLMember" id="pagp_NGLMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NaturalGasMember" id="pagp_NaturalGasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NaturalGasStorageAcquisitionMember" id="pagp_NaturalGasStorageAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NaturalGasStorageMember" id="pagp_NaturalGasStorageMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NaturalResourcesContaminationDamagesSettled" id="pagp_NaturalResourcesContaminationDamagesSettled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="NetCashPaidReceivedForTerminatedInterestRateAndForeignCurrencyHedgingInstruments" id="pagp_NetCashPaidReceivedForTerminatedInterestRateAndForeignCurrencyHedgingInstruments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLP" id="pagp_NetIncomeLossAvailableToLimitedPartnersAfterAdjustmentForTwoClassMethodForMLP" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicAndDilutedAbstract" id="pagp_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicAndDilutedAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetLongPositionOnCrudeOilDerivativeContractsMember" id="pagp_NetLongPositionOnCrudeOilDerivativeContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetLongPositionOnNaturalGasSwapsContractsMember" id="pagp_NetLongPositionOnNaturalGasSwapsContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetProceedsFromRepaymentsOfRevolvingCreditFacilities" id="pagp_NetProceedsFromRepaymentsOfRevolvingCreditFacilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetProceedsFromRepaymentsOfSeniorUnsecuredRevolvingCreditFacilities" id="pagp_NetProceedsFromRepaymentsOfSeniorUnsecuredRevolvingCreditFacilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetProceedsFromRepaymentsOfShortTermLetterOfCreditAndHedgedInventoryFacility" id="pagp_NetProceedsFromRepaymentsOfShortTermLetterOfCreditAndHedgedInventoryFacility" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetProceedsFromRepaymentsOfSubsidiaryCreditAgreement" id="pagp_NetProceedsFromRepaymentsOfSubsidiaryCreditAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="NetShortSpreadPositionOnAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" id="pagp_NetShortSpreadPositionOnAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NetShortSwapPositionConsistingOfNYMEXAndICESwapsMember" id="pagp_NetShortSwapPositionConsistingOfNYMEXAndICESwapsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NewAccountingPronouncementsAndChangesInAccountingPrinciplesLineItems" id="pagp_NewAccountingPronouncementsAndChangesInAccountingPrinciplesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NewAccountingPronouncementsAndChangesInAccountingPrinciplesTable" id="pagp_NewAccountingPronouncementsAndChangesInAccountingPrinciplesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NexenAcquisitionMember" id="pagp_NexenAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonOfficerEmployeeLongTermIncentiveTrackingUnitPlanMember" id="pagp_NonOfficerEmployeeLongTermIncentiveTrackingUnitPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonmonetaryNotionalAmountOfPriceRiskDerivativesAveragePerDay" id="pagp_NonmonetaryNotionalAmountOfPriceRiskDerivativesAveragePerDay" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NonmonetaryNotionalAmountOfPriceRiskDerivativesHedgedToManageTheRiskOfNotUtilizing" id="pagp_NonmonetaryNotionalAmountOfPriceRiskDerivativesHedgedToManageTheRiskOfNotUtilizing" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" id="pagp_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDerivativesHeldWithCreditRiskRelatedContingentFeatures" id="pagp_NumberOfDerivativesHeldWithCreditRiskRelatedContingentFeatures" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfEnforcementActionsFiled" id="pagp_NumberOfEnforcementActionsFiled" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfEventsResultingInRelease" id="pagp_NumberOfEventsResultingInRelease" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfOneYearExtensionsOfRevolvingCreditFacility" id="pagp_NumberOfOneYearExtensionsOfRevolvingCreditFacility" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPotentialConversionTranchesAfterAmendedAndRestatedAgreement" id="pagp_NumberOfPotentialConversionTranchesAfterAmendedAndRestatedAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPotentialConversionTranchesBeforeAmendedAndRestatedAgreement" id="pagp_NumberOfPotentialConversionTranchesBeforeAmendedAndRestatedAgreement" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfTermLoans" id="pagp_NumberOfTermLoans" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfTerminatedInterestRateSwaps" id="pagp_NumberOfTerminatedInterestRateSwaps" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfYearsSourcingServicesForGasSupplyWillBeProvidedAfterAcquisition" id="pagp_NumberOfYearsSourcingServicesForGasSupplyWillBeProvidedAfterAcquisition" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumeratorForBasicAndDilutedEarningsPerLimitedPartnerUnitAbstract" id="pagp_NumeratorForBasicAndDilutedEarningsPerLimitedPartnerUnitAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OccidentalPetroleumCorporationMember" id="pagp_OccidentalPetroleumCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OffsettingAssetsLiabilitiesLineItems" id="pagp_OffsettingAssetsLiabilitiesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OffsettingAssetsLiabilitiesTable" id="pagp_OffsettingAssetsLiabilitiesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OilAndGasTerminalLocationDomain" id="pagp_OilAndGasTerminalLocationDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationAndBasisOfPresentationLineItems" id="pagp_OrganizationAndBasisOfPresentationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" id="pagp_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Other2010AcquisitionsMember" id="pagp_Other2010AcquisitionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAcquisitionsIn2011Member" id="pagp_OtherAcquisitionsIn2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAcquisitionsMember" id="pagp_OtherAcquisitionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAgreementsMember" id="pagp_OtherAgreementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAssetsNoncurrentGross" id="pagp_OtherAssetsNoncurrentGross" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OtherConsolidatedEquityCompensationInformationAbstract" id="pagp_OtherConsolidatedEquityCompensationInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherEquityOfferingsMember" id="pagp_OtherEquityOfferingsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherLongTermAssetsMember" id="pagp_OtherLongTermAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherLongTermLiabilitiesMember" id="pagp_OtherLongTermLiabilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherNoncurrentLongTermDebt" id="pagp_OtherNoncurrentLongTermDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OtherNonoperatingIncomeExpenseMember" id="pagp_OtherNonoperatingIncomeExpenseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OutstandingUnitsEarnedRollForward" id="pagp_OutstandingUnitsEarnedRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OutstandingUnitsRollForward" id="pagp_OutstandingUnitsRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PAAContinuousOfferingProgramMember" id="pagp_PAAContinuousOfferingProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PAAGPLLCMember" id="pagp_PAAGPLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGClassBUnitsMember" id="pagp_PNGClassBUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGContinuousOfferingProgramMember" id="pagp_PNGContinuousOfferingProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="May2013EquityDistributionAgreementMember" id="pagp_May2013EquityDistributionAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGGOBondTermLoansMember" id="pagp_PNGGOBondTermLoansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGTermLoanOneMember" id="pagp_PNGTermLoanOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGTermLoanTwoMember" id="pagp_PNGTermLoanTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGGeneralPartnerMember" id="pagp_PNGGeneralPartnerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGLongTermIncentivePlanAwardsMember" id="pagp_PNGLongTermIncentivePlanAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGLongTermIncentivePlansMember" id="pagp_PNGLongTermIncentivePlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGMember" id="pagp_PNGMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGSeniorUnsecuredCreditFacilityMember" id="pagp_PNGSeniorUnsecuredCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGSeniorUnsecuredRevolvingCreditFacilityMember" id="pagp_PNGSeniorUnsecuredRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PacificAtlanticTerminalsLLCMember" id="pagp_PacificAtlanticTerminalsLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PacificEnergyPartnersLPMember" id="pagp_PacificEnergyPartnersLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PacificPipelineSystemLLCMember" id="pagp_PacificPipelineSystemLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalAndDistributionLineItems" id="pagp_PartnersCapitalAndDistributionLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalAndDistributionsTable" id="pagp_PartnersCapitalAndDistributionsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalCommonUnitHolderUnitsOutstanding" id="pagp_PartnersCapitalCommonUnitHolderUnitsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PartnersCapitalIncreaseFromSubsidiaryStockIssuance" id="pagp_PartnersCapitalIncreaseFromSubsidiaryStockIssuance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PartsAndSuppliesMember" id="pagp_PartsAndSuppliesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PemexExploracionyProduccionMember" id="pagp_PemexExploracionyProduccionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedDelawareActionMember" id="pagp_ConsolidatedDelawareActionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedTexasActionMember" id="pagp_ConsolidatedTexasActionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConsolidatedFederalActionMember" id="pagp_ConsolidatedFederalActionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerUnitImpactToNetIncomeLossPerOutstandingLimitedPartnershipUnitBasic" id="pagp_PerUnitImpactToNetIncomeLossPerOutstandingLimitedPartnershipUnitBasic" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerUnitImpactToNetIncomeLossPerOutstandingLimitedPartnershipUnitDiluted" id="pagp_PerUnitImpactToNetIncomeLossPerOutstandingLimitedPartnershipUnitDiluted" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageDecreaseInDistributionLevelVestingCriteria" id="pagp_PercentageDecreaseInDistributionLevelVestingCriteria" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageDistributionOfAvailableCash" id="pagp_PercentageDistributionOfAvailableCash" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfFaceValueAtWhichSeniorNotesAreSold" id="pagp_PercentageOfFaceValueAtWhichSeniorNotesAreSold" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="PerformanceThresholdsAbstract" id="pagp_PerformanceThresholdsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PipelineTariffActivitiesTruckingAndRelatedRevenues" id="pagp_PipelineTariffActivitiesTruckingAndRelatedRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="PlainsAAPLPMember" id="pagp_PlainsAAPLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanGPLLCMember" id="pagp_PlainsAllAmericanGPLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPipelineLPMember" id="pagp_PlainsAllAmericanPipelineLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsEagleFordPipelineLLCMember" id="pagp_PlainsEagleFordPipelineLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PortionOfUnitsForWhichPerformanceThresholdsModified" id="pagp_PortionOfUnitsForWhichPerformanceThresholdsModified" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromTermLoan" id="pagp_ProceedsFromTermLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PropertyTaxAbatementMember" id="pagp_PropertyTaxAbatementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PurchaseOfStockParentPercentageOfOwnershipInSubsidiaryContributedInOffering" id="pagp_PurchaseOfStockParentPercentageOfOwnershipInSubsidiaryContributedInOffering" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PurchasesAndRelatedCosts" id="pagp_PurchasesAndRelatedCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PurchasesAndRelatedCostsMember" id="pagp_PurchasesAndRelatedCostsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PurchasesAndRelatedCostsPolicyTextBlock" id="pagp_PurchasesAndRelatedCostsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RailTerminalLocationAxis" id="pagp_RailTerminalLocationAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RainbowPipelineCompanyMember" id="pagp_RainbowPipelineCompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RainbowPipelineMember" id="pagp_RainbowPipelineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RangeOfAnnualizedVestingDistributionAmountDollarsFrom1.35ToDollars1.55Member" id="pagp_RangeOfAnnualizedVestingDistributionAmountDollarsFrom1.35ToDollars1.55Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RangelandPipelineReleaseMember" id="pagp_RangelandPipelineReleaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReceivablesLineItems" id="pagp_ReceivablesLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReceivablesTable" id="pagp_ReceivablesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReconciliationOfOperatingProfitLossFromSegmentsToNetIncomeAttributableToParentTableTextBlock" id="pagp_ReconciliationOfOperatingProfitLossFromSegmentsToNetIncomeAttributableToParentTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReductionInAllIncentiveDistributions" id="pagp_ReductionInAllIncentiveDistributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInFutureIncentiveDistributionsInNextTwelveMonths" id="pagp_ReductionInFutureIncentiveDistributionsInNextTwelveMonths" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsAbstract" id="pagp_ReductionInIncentiveDistributionsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReductionPerYearInIncentiveDistributionRightsAbstract" id="pagp_ReductionPerYearInIncentiveDistributionRightsAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReductionPerYearInIncentiveDistributionRightsThereafter" id="pagp_ReductionPerYearInIncentiveDistributionRightsThereafter" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionPerYearInIncentiveDistributionRightsYearOne" id="pagp_ReductionPerYearInIncentiveDistributionRightsYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionPerYearInIncentiveDistributionRightsYearThree" id="pagp_ReductionPerYearInIncentiveDistributionRightsYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionPerYearInIncentiveDistributionRightsYearTwo" id="pagp_ReductionPerYearInIncentiveDistributionRightsYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="RelatedPartyOwnershipInterestInSubsidiaryPercentage" id="pagp_RelatedPartyOwnershipInterestInSubsidiaryPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RemediationCostsIncurredSinceBusinessAcquired" id="pagp_RemediationCostsIncurredSinceBusinessAcquired" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RevenuesNetMember" id="pagp_RevenuesNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RobinsonLakePipelineMember" id="pagp_RobinsonLakePipelineMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RockyMountainPipelinesSystemLlcMember" id="pagp_RockyMountainPipelinesSystemLlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SLCPipelineLLCMember" id="pagp_SLCPipelineLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfStockAxis" id="pagp_SaleOfStockAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfStockConsiderationReceivedOnTransactionFromParent" id="pagp_SaleOfStockConsiderationReceivedOnTransactionFromParent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="SaleOfStockNumberOfSharesIssuedToParentInTransaction" id="pagp_SaleOfStockNumberOfSharesIssuedToParentInTransaction" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfStockPercentOfEquityIssuedInTransaction" id="pagp_SaleOfStockPercentOfEquityIssuedInTransaction" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SalesAndRelatedRevenues" id="pagp_SalesAndRelatedRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SalesAndRelatedRevenuesMember" id="pagp_SalesAndRelatedRevenuesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfCapitalUnitsIssuedDuringPeriodTableTextBlock" id="pagp_ScheduleOfCapitalUnitsIssuedDuringPeriodTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfChangesInMinorityInterestInMembersEquityTableTextBlock" id="pagp_ScheduleOfChangesInMinorityInterestInMembersEquityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfChangesInMinorityInterestInPartnersCapitalTableTextBlock" id="pagp_ScheduleOfChangesInMinorityInterestInPartnersCapitalTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDebtInstrumentsTable" id="pagp_ScheduleOfDebtInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" id="pagp_ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOffsettingAssetsAndLiabilitiesTableTextBlock" id="pagp_ScheduleOfOffsettingAssetsAndLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfOperationalAndFinancialConditionsNecessaryForConversionOfSubordinatedUnitsTableTextBlock" id="pagp_ScheduleOfOperationalAndFinancialConditionsNecessaryForConversionOfSubordinatedUnitsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfPerUnitImpactOfAdditionalParticipationInUndistributedEarningsToEarningsPerUnitBasicAndDilutedTableTextBlock" id="pagp_ScheduleOfPerUnitImpactOfAdditionalParticipationInUndistributedEarningsToEarningsPerUnitBasicAndDilutedTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfReductionInIncentiveDistributionsRelatedToAcquisitionsTableTextBlock" id="pagp_ScheduleOfReductionInIncentiveDistributionsRelatedToAcquisitionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationClassBUnitsAwardActivityTableTextBlock" id="pagp_ScheduleOfShareBasedCompensationClassBUnitsAwardActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedPaymentAwardsExpenseTableTextBlock" id="pagp_ScheduleOfShareBasedPaymentAwardsExpenseTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SegmentPipelineTariffActivitiesTruckingMember" id="pagp_SegmentPipelineTariffActivitiesTruckingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SegmentSalesAndLogisticsMember" id="pagp_SegmentSalesAndLogisticsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SegmentStorageTerminallingProcessingMember" id="pagp_SegmentStorageTerminallingProcessingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDue2023At3.85PercentMember" id="pagp_SeniorNotesDue2023At3.85PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInDecember2013At5.63PercentMember" id="pagp_SeniorNotesDueInDecember2013At5.63PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorSecuredHedgedInventoryDebtFacilityMember" id="pagp_SeniorSecuredHedgedInventoryDebtFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredRevolvingCreditFacilityMaturingIn2014Member" id="pagp_SeniorUnsecuredRevolvingCreditFacilityMaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorUnsecuredRevolvingCreditFacilityMember" id="pagp_SeniorUnsecuredRevolvingCreditFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="September2012ContinuousOfferingProgramMember" id="pagp_September2012ContinuousOfferingProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeriesASubordinatedUnitsMember" id="pagp_SeriesASubordinatedUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeriesBSubordinatedUnitsMember" id="pagp_SeriesBSubordinatedUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SettoonTowingMember" id="pagp_SettoonTowingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingOfEarnedUnitsPercentage" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingOfEarnedUnitsPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRight" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRight" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightDistributionEquivalentRights" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightDistributionEquivalentRights" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedInPeriod" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedGrantDateFairValue" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionNonvestedGrantDateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedPercentageIncrements" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedPercentageIncrements" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodGrantDateFairValue" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodGrantDateFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsEarnedNumber" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsEarnedNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstanding" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReservedForFutureGrantsOutstanding" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReservedForFutureGrantsOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnitsEarnedOutstanding" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnitsEarnedOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearFour" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearFour" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearOne" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearOne" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearThree" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearThree" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearTwo" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearTwo" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingThereafter" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingThereafter" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriod" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantsInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestAnnualizedDistributionThreshold" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestAnnualizedDistributionThreshold" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecreaseStockSplit" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherShareIncreaseDecreaseStockSplit" type="xbrli:stringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherSharesAvailableForIssuanceIncreaseDecreaseStockSplit" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherSharesAvailableForIssuanceIncreaseDecreaseStockSplit" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodPriorToEachVestingDateForWhichAverageAnnualizedDistributionThresholdMustBeMaintained" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodPriorToEachVestingDateForWhichAverageAnnualizedDistributionThresholdMustBeMaintained" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestedInPeriodSettledInCash" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestedInPeriodSettledInCash" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingAfterFifthAnniversaryOfDateOfGrantPercentage" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingAfterFifthAnniversaryOfDateOfGrantPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingOfEarnedUnitsOnFifthAnniversaryOfDateOfGrantPercentage" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingOfEarnedUnitsOnFifthAnniversaryOfDateOfGrantPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesAuthorizedUnderEquityCompensationPlansPeriodAfterDistributionEarned" id="pagp_ShareBasedCompensationSharesAuthorizedUnderEquityCompensationPlansPeriodAfterDistributionEarned" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedDistributionLowerRangeLimit" id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedDistributionLowerRangeLimit" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedDistributionUpperRangeLimit" id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedDistributionUpperRangeLimit" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedVestingDistributionRangeAxis" id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedVestingDistributionRangeAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedVestingDistributionRangeDomain" id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansByAnnualizedVestingDistributionRangeDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortNaturalGasPositionRelatedToAnticipatedNaturalGasSalesMember" id="pagp_ShortNaturalGasPositionRelatedToAnticipatedNaturalGasSalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortPositionContractsRelatedToAnticipatedInventorySalesMember" id="pagp_ShortPositionContractsRelatedToAnticipatedInventorySalesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortPropanePositionContractsRelatedToSubsequentSaleOfProductMember" id="pagp_ShortPropanePositionContractsRelatedToSubsequentSaleOfProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortTermBorrowingsRepaymentPeriod" id="pagp_ShortTermBorrowingsRepaymentPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SouthernPinesAcquisitionMember" id="pagp_SouthernPinesAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SpecialPAAAwardsMember" id="pagp_SpecialPAAAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StJamesLouisianaMember" id="pagp_StJamesLouisianaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StandbyLetterOfCreditIssuancePeriodUpperLimit" id="pagp_StandbyLetterOfCreditIssuancePeriodUpperLimit" type="us-types:durationStringItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="StandbyLettersOfCreditReceived" id="pagp_StandbyLettersOfCreditReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="StatementOfLimitedLiabilityCompanyAbstract" id="pagp_StatementOfLimitedLiabilityCompanyAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesThroughExerciseOfUnderwriterOption" id="pagp_StockIssuedDuringPeriodSharesThroughExerciseOfUnderwriterOption" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesThroughPartialExerciseOfUnderwriterOverallotmentOption" id="pagp_StockIssuedDuringPeriodSharesThroughPartialExerciseOfUnderwriterOverallotmentOption" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StorageTerminalAndRailFacilitiesMember" id="pagp_StorageTerminalAndRailFacilitiesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StorageTerminallingProcessingAndRelatedRevenues" id="pagp_StorageTerminallingProcessingAndRelatedRevenues" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StorageTerminallingProcessingAndRelatedRevenuesMember" id="pagp_StorageTerminallingProcessingAndRelatedRevenuesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubordinatedUnitConversionRatio" id="pagp_SubordinatedUnitConversionRatio" type="xbrli:decimalItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubordinatedUnitsDistributionAvailableThresholdAnnualized" id="pagp_SubordinatedUnitsDistributionAvailableThresholdAnnualized" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubordinatedUnitsDistributionReceivedThresholdAnnualized" id="pagp_SubordinatedUnitsDistributionReceivedThresholdAnnualized" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubordinatedUnitsMember" id="pagp_SubordinatedUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryEquityIssuanceUnitsPurchased" id="pagp_SubsidiaryEquityIssuanceUnitsPurchased" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsidiaryProceedsFromGeneralPartnerContribution" id="pagp_SubsidiaryProceedsFromGeneralPartnerContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TenForwardStartingThirtyYearInterestRateSwapMember" id="pagp_TenForwardStartingThirtyYearInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TexasNewMexicoMember" id="pagp_TexasNewMexicoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThirdQuarterDistributionFY2013Member" id="pagp_ThirdQuarterDistributionFY2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="FourthQuarterDistributionFY2013Member" id="pagp_FourthQuarterDistributionFY2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TotalCostToCleanUpAndRemediateSiteBeforeInsuranceRecoveries" id="pagp_TotalCostToCleanUpAndRemediateSiteBeforeInsuranceRecoveries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TotalDistributionPaidDuringPeriod" id="pagp_TotalDistributionPaidDuringPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TotalEstimatedCostToCleanUpAndRemediateSiteBeforeInsuranceRecoveries" id="pagp_TotalEstimatedCostToCleanUpAndRemediateSiteBeforeInsuranceRecoveries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="TrancheFiveMember" id="pagp_TrancheFiveMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrancheFourMember" id="pagp_TrancheFourMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrancheOneMember" id="pagp_TrancheOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrancheThreeMember" id="pagp_TrancheThreeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TrancheTwoMember" id="pagp_TrancheTwoMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransferOfSubsidiaryStockToNoncontrollingInterestsInSettlementOfEquityCompensationAwards" id="pagp_TransferOfSubsidiaryStockToNoncontrollingInterestsInSettlementOfEquityCompensationAwards" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TruckingEquipmentAndOtherMember" id="pagp_TruckingEquipmentAndOtherMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="USDRailTerminalAcquisitionMember" id="pagp_USDRailTerminalAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnderwrittenPublicOfferingMember" id="pagp_UnderwrittenPublicOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnrealizedGainsAndLossesRelatingToLevel3DerivativesAbstract" id="pagp_UnrealizedGainsAndLossesRelatingToLevel3DerivativesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VariationMarginPaidReceived" id="pagp_VariationMarginPaidReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="VolumeOfCrudeOilRecoveredByCleanUpOperations" id="pagp_VolumeOfCrudeOilRecoveredByCleanUpOperations" type="num:volumeItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VolumesOfOperationalStorageCapacity" id="pagp_VolumesOfOperationalStorageCapacity" type="num:volumeItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShortWTIPositionContractsRelatedToSubsequentSaleOfProductMember" id="pagp_ShortWTIPositionContractsRelatedToSubsequentSaleOfProductMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WesternRefiningAcquisitionMember" id="pagp_WesternRefiningAcquisitionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WhiteCliffsPipelineLlcMember" id="pagp_WhiteCliffsPipelineLlcMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmerican2013LongTermIncentivePlansMember" id="pagp_PlainsAllAmerican2013LongTermIncentivePlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsGPHoldingsLongTermIncentivePlansMember" id="pagp_PlainsGPHoldingsLongTermIncentivePlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ContributionsReceivedOrToBeReceived" id="pagp_ContributionsReceivedOrToBeReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationPlanAAPManagementUnitsMember" id="pagp_EquityBasedCompensationPlanAAPManagementUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumeratorForDilutedEarningsPerShareAbstract" id="pagp_NumeratorForDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncrementalNetIncomeLossFromAssumedConversionOfUnits" id="pagp_IncrementalNetIncomeLossFromAssumedConversionOfUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AcquisitionsIn2013Member" id="pagp_AcquisitionsIn2013Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherAcquisitionsIn2012Member" id="pagp_OtherAcquisitionsIn2012Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DenominatorForDilutedEarningsPerShareAbstract" id="pagp_DenominatorForDilutedEarningsPerShareAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainLossOnSaleOfLinefill" id="pagp_GainLossOnSaleOfLinefill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ProceedsFromSaleOfLinefill" id="pagp_ProceedsFromSaleOfLinefill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfRevenuesFromExternalCustomersByGeographicalAreasTableTextBlock" id="pagp_ScheduleOfRevenuesFromExternalCustomersByGeographicalAreasTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfLongLivedAssetsByGeographicalAreasTableTextBlock" id="pagp_ScheduleOfLongLivedAssetsByGeographicalAreasTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationManagementUnitsActivityTableTextBlock" id="pagp_ScheduleOfShareBasedCompensationManagementUnitsActivityTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfLongTermIncentivePlanAwardsOutstandingAndExpectedToVestTableTextBlock" id="pagp_ScheduleOfLongTermIncentivePlanAwardsOutstandingAndExpectedToVestTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAmortizationTableTextBlock" id="pagp_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAmortizationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrantDateFairValueOfOutstandingAAPManagementUnitsRollForward" id="pagp_GrantDateFairValueOfOutstandingAAPManagementUnitsRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfLongTermIncentivePlanConsolidated" id="pagp_NumberOfLongTermIncentivePlanConsolidated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationAbstract" id="pagp_EquityBasedCompensationFairValueFutureAmortizationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearOne" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearOne" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearTwo" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearTwo" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearThree" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearThree" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearFour" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearFive" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedDistributionProbableOfOccurring" id="pagp_AnnualizedDistributionProbableOfOccurring" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrossMargin" id="pagp_GrossMargin" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="CapitalExpenditure" id="pagp_CapitalExpenditure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriod" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ThreeForwardStartingInterestRateSwapMember" id="pagp_ThreeForwardStartingInterestRateSwapMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsEagleFordPipelineLLCAndWhiteCliffsPipelineLLCMember" id="pagp_PlainsEagleFordPipelineLLCAndWhiteCliffsPipelineLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonSharesClassAMember" id="pagp_CommonSharesClassAMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonSharesClassBMember" id="pagp_CommonSharesClassBMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanLongTermIncentivePlansMember" id="pagp_PlainsAllAmericanLongTermIncentivePlansMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AnnualizedVestingDistributionRangeMember" id="pagp_AnnualizedVestingDistributionRangeMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncreaseDecreaseInPartnersCapitalAndMembersEquityRollForward" id="pagp_IncreaseDecreaseInPartnersCapitalAndMembersEquityRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfCommonUnitsIssuedByRightToReceivePerShareOfSubsidiaryOwned" id="pagp_NumberOfCommonUnitsIssuedByRightToReceivePerShareOfSubsidiaryOwned" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.06MaturingIn2014Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.06MaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.07MaturingIn2015Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.07MaturingIn2015Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.06Member" id="pagp_ForeignExchangeForwardContractsThatExchangeCADForUSDAtTheRateUSD1.00ToCAD1.06Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.05MaturingIn2014Member" id="pagp_ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.05MaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.05Member" id="pagp_ForeignExchangeForwardContractsThatExchangeUSDForCADAtTheRateUSD1.00ToCAD1.05Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ForeignExchangeForwardContractsMaturingIn2014Member" id="pagp_ForeignExchangeForwardContractsMaturingIn2014Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterestUnits" id="pagp_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterestUnits" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxesAttributableToNoncontrollingInterest" id="pagp_IncomeTaxesAttributableToNoncontrollingInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DistributionOfProceedsFromIssuanceInitialPublicOffering" id="pagp_DistributionOfProceedsFromIssuanceInitialPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInJune2015At5.25PercentMember" id="pagp_SeniorNotesDueInJune2015At5.25PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SeniorNotesDueInAugust2016At5.88PercentMember" id="pagp_SeniorNotesDueInAugust2016At5.88PercentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalAccountUnitsSoldInPublicOfferingOverAllotmentOption" id="pagp_PartnersCapitalAccountUnitsSoldInPublicOfferingOverAllotmentOption" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfSharesOutstandingReconciliationTableTextBlock" id="pagp_ScheduleOfSharesOutstandingReconciliationTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SharesOutstandingReconciliationAbstract" id="pagp_SharesOutstandingReconciliationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LimitedPartnersCapitalAccountUnitsOrSharesExchanged" id="pagp_LimitedPartnersCapitalAccountUnitsOrSharesExchanged" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsPerQuarterCurrentPeriod" id="pagp_ReductionInIncentiveDistributionsPerQuarterCurrentPeriod" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionInIncentiveDistributionsInFebruary2014" id="pagp_ReductionInIncentiveDistributionsInFebruary2014" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionInIncentiveDistributionsPerQuarterFromMay2014ThroughNovember2015" id="pagp_ReductionInIncentiveDistributionsPerQuarterFromMay2014ThroughNovember2015" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionInIncentiveDistributionsPerQuarterAfterNovember2015" id="pagp_ReductionInIncentiveDistributionsPerQuarterAfterNovember2015" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ReductionInIncentiveDistributions" id="pagp_ReductionInIncentiveDistributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsIn2014" id="pagp_ReductionInIncentiveDistributionsIn2014" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsIn2015" id="pagp_ReductionInIncentiveDistributionsIn2015" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsIn2016" id="pagp_ReductionInIncentiveDistributionsIn2016" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ReductionInIncentiveDistributionsInAfter2016" id="pagp_ReductionInIncentiveDistributionsInAfter2016" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentSharesIssuedOrIssuableValue" id="pagp_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParentSharesIssuedOrIssuableValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="UnitConversionRatio" id="pagp_UnitConversionRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxTable" id="pagp_IncomeTaxTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeTaxLineItems" id="pagp_IncomeTaxLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment" id="pagp_LineOfCreditFacilityMaximumBorrowingCapacityBeforeAmendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DebitInstrumentCarryingAmountBeforeAmendment" id="pagp_DebitInstrumentCarryingAmountBeforeAmendment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PercentageInterestAndRightsPlegedToSecureCreditFacility" id="pagp_PercentageInterestAndRightsPlegedToSecureCreditFacility" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentLeverageRatioMaximum" id="pagp_DebtInstrumentLeverageRatioMaximum" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" id="pagp_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="Phillips66CompanyMember" id="pagp_Phillips66CompanyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DistributionOfProceedsFromInitialPublicOffering" id="pagp_DistributionOfProceedsFromInitialPublicOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalDeferredTaxAsset" id="pagp_PartnersCapitalDeferredTaxAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriodWeightedAverageGrantDateFairValue" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriodWeightedAverageGrantDateFairValue" type="num:perShareItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityBasedCompensationFairValueFutureAmortizationExpenseAfterYearFive" id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseAfterYearFive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PartnersCapitalAccountTransferOfOwnershipInterest" id="pagp_PartnersCapitalAccountTransferOfOwnershipInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NonproratedQuarterlyDistributionMember" id="pagp_NonproratedQuarterlyDistributionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonproratedAnnualDistributionMember" id="pagp_NonproratedAnnualDistributionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnallocatedGeneralAndAdministrativeExpense" id="pagp_UnallocatedGeneralAndAdministrativeExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PreviousLongTermIncentivePlanMember" id="pagp_PreviousLongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableUnderPreviousPlans" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableUnderPreviousPlans" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedUnderPreviousPlans" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesGrantedUnderPreviousPlans" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized" id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardAdditionalNumberOfSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExxonMobilCorporationMember" id="pagp_ExxonMobilCorporationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDirectorsThatReceivedAwards" id="pagp_NumberOfDirectorsThatReceivedAwards" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherComprehensiveIncomePartnershipsPortionOfEquityInvestee" id="pagp_OtherComprehensiveIncomePartnershipsPortionOfEquityInvestee" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AccumulatedOtherComprehensiveIncomeOtherAdjustmentsMember" id="pagp_AccumulatedOtherComprehensiveIncomeOtherAdjustmentsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AmountOfFutureTaxExemptDebtIssuance" id="pagp_AmountOfFutureTaxExemptDebtIssuance" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="PNGMergerMember" id="pagp_PNGMergerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" id="pagp_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PNGTransactionGrantsMember" id="pagp_PNGTransactionGrantsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AAPUnitsMember" id="pagp_AAPUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GeneralParnterUnitsMember" id="pagp_GeneralParnterUnitsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LimitedPartnersCapitalAccountSharesIssuedInExchange" id="pagp_LimitedPartnersCapitalAccountSharesIssuedInExchange" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" id="pagp_NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="UnitExchangeRatio" id="pagp_UnitExchangeRatio" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DeferredTaxAssetsInvestmentsInSubsidiaries" id="pagp_DeferredTaxAssetsInvestmentsInSubsidiaries" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
</xsd:schema>
