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  <xsd:element id="pagp_CommissionPaidToSalesAgent" name="CommissionPaidToSalesAgent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_CommonUnitsMember" name="CommonUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_CompliancewithRegulationsandOtherMattersMember" name="CompliancewithRegulationsandOtherMattersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" name="ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ConsolidatedFinanceSubsidiaryIssuerMember" name="ConsolidatedFinanceSubsidiaryIssuerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ContinuousOfferingProgramMember" name="ContinuousOfferingProgramMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ConversionOfAapManagementUnitsIntoAapUnitsMember" name="ConversionOfAapManagementUnitsIntoAapUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_CounterpartyDeficiencies" name="CounterpartyDeficiencies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pagp_CounterpartyDeficienciesUnbilledAndUncollected" name="CounterpartyDeficienciesUnbilledAndUncollected" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_CrudeOilGradeSpreadPositionsMember" name="CrudeOilGradeSpreadPositionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_DebtAssumed" name="DebtAssumed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" name="DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAMaximum" name="DebtInstrumentCoverageRatioDebtToEBITDAMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_DeferredStateandLocalIncomeTaxExpenseBenefitNetofFederalBenefitExpense" name="DeferredStateandLocalIncomeTaxExpenseBenefitNetofFederalBenefitExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_DeferredTaxAssetsInvestmentsInSubsidiaries" name="DeferredTaxAssetsInvestmentsInSubsidiaries" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_DeficienciesUnderMinimumVolumeCommitmentsNet" name="DeficienciesUnderMinimumVolumeCommitmentsNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_DepreciationAndAmortizationMember" name="DepreciationAndAmortizationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_DepreciationAndAmortizationOfUnconsolidatedEntities" name="DepreciationAndAmortizationOfUnconsolidatedEntities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_DiamondPipelineLlcMember" name="DiamondPipelineLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_DistributionEquivalentRightsCashPayments" name="DistributionEquivalentRightsCashPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_DistributionsReceivedFromConsolidatedSubsidiary" name="DistributionsReceivedFromConsolidatedSubsidiary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_DocumentEntityInformationAbstract" name="DocumentEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EagleFordPipelineLLCMember" name="EagleFordPipelineLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EagleFordTerminalsCorpusChristiLlcMember" name="EagleFordTerminalsCorpusChristiLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EightForwardStartingThirtyYearInterestRateSwapOneMember" name="EightForwardStartingThirtyYearInterestRateSwapOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EightForwardStartingThirtyYearInterestRateSwapThreeMember" name="EightForwardStartingThirtyYearInterestRateSwapThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EightForwardStartingThirtyYearInterestRateSwapTwoMember" name="EightForwardStartingThirtyYearInterestRateSwapTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EliminationsAndReconcilingItemsMember" name="EliminationsAndReconcilingItemsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EmissionReductionCreditsMember" name="EmissionReductionCreditsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_EquityBasedCompensationFairValueFutureAmortizationAbstract" name="EquityBasedCompensationFairValueFutureAmortizationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFive" name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearFive" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearFour" name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearFour" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearOne" name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearOne" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearThree" name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearThree" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_EquityBasedCompensationFairValueFutureAmortizationExpenseYearTwo" name="EquityBasedCompensationFairValueFutureAmortizationExpenseYearTwo" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_EquityBasedCompensationPlanAAPManagementUnitsMember" name="EquityBasedCompensationPlanAAPManagementUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityBasedCompensationPlanAAPManagementUnitsPolicyTextBlock" name="EquityBasedCompensationPlanAAPManagementUnitsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityDistributionAgreementAuthorizedSaleAmount" name="EquityDistributionAgreementAuthorizedSaleAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pagp_EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits" name="EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityMethodInvestmentOwnershipPercentageAcquired" name="EquityMethodInvestmentOwnershipPercentageAcquired" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityMethodInvestmentOwnershipPercentageSold" name="EquityMethodInvestmentOwnershipPercentageSold" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome" name="EquityMethodInvestmentSummarizedFinancialInformationOperatingIncome" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_EquivalentDistributionAmount" name="EquivalentDistributionAmount" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_EstimatedBorrowingForTrueUpDistributionToSubsidiaryUnitholdersIfTransactionsNotClosed" name="EstimatedBorrowingForTrueUpDistributionToSubsidiaryUnitholdersIfTransactionsNotClosed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_EstimatedSizeOfRelease" name="EstimatedSizeOfRelease" nillable="true" substitutionGroup="xbrli:item" type="num:volumeItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ExchangeOfAapUnitsAndClassBSharesForClassaSharesMember" name="ExchangeOfAapUnitsAndClassBSharesForClassaSharesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ExpenseForWithholdingTaxes" name="ExpenseForWithholdingTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ExxonMobilCorporationMember" name="ExxonMobilCorporationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationDerivativesEnteredInto" name="FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationDerivativesEnteredInto" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" name="FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_FieldOperatingCostsMember" name="FieldOperatingCostsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2016Member" name="ForeignExchangeForwardContractsThatExchangeCanadianDollarsForUSDollarsAtAverageRateDisclosedMaturingIn2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2016Member" name="ForeignExchangeForwardContractsThatExchangeUSDollarsForCanadianDollarsAtAverageRateDisclosedMaturingIn2016Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate" name="ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_FourthQuarterDistributionMember" name="FourthQuarterDistributionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_FrontierAspenLLCMember" name="FrontierAspenLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_FrontierPipelineCompanyMember" name="FrontierPipelineCompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_GainLossOnSaleOfLinefillAndBaseGas" name="GainLossOnSaleOfLinefillAndBaseGas" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_GainOnDispositionOfAssets" name="GainOnDispositionOfAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_GainsLossesFromDerivativeActivitiesNetofInventoryValuationAdjustments" name="GainsLossesFromDerivativeActivitiesNetofInventoryValuationAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_GeneralPartnerDistributionIncludingIncentiveDistributionPercentage" name="GeneralPartnerDistributionIncludingIncentiveDistributionPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_GeneralPartnerDistributionLevelFourMember" name="GeneralPartnerDistributionLevelFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_GeneralPartnerDistributionLevelThreeMember" name="GeneralPartnerDistributionLevelThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_GeneralPartnerDistributionLevelTwoMember" name="GeneralPartnerDistributionLevelTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_GeneralPartnerDistributionPercentage" name="GeneralPartnerDistributionPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_GeneralPartnerIncentiveDistributionThreshold" name="GeneralPartnerIncentiveDistributionThreshold" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_GrantDateFairValueOfOutstandingAAPManagementUnitsRollForward" name="GrantDateFairValueOfOutstandingAAPManagementUnitsRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_GrossMargin" name="GrossMargin" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_IncomeTaxesAttributableToNoncontrollingInterest" name="IncomeTaxesAttributableToNoncontrollingInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember" name="IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_IndictmentNumberOfCountsRelatedToReleaseOfCrudeOilOrReportingOfRelease" name="IndictmentNumberOfCountsRelatedToReleaseOfCrudeOilOrReportingOfRelease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_IndictmentNumberOfFelonyCharges" name="IndictmentNumberOfFelonyCharges" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_IndictmentNumberOfMisdemeanorChargesRelatedToReleaseOfCrudeOilOrReportingOfRelease" name="IndictmentNumberOfMisdemeanorChargesRelatedToReleaseOfCrudeOilOrReportingOfRelease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_IndictmentNumberOfMisdemeanorChargesRelatingToWildlife" name="IndictmentNumberOfMisdemeanorChargesRelatingToWildlife" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_IndictmentTotalNumberOfCounts" name="IndictmentTotalNumberOfCounts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InitialMargin" name="InitialMargin" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_IntegratedSystemOfNGLAssetsMember" name="IntegratedSystemOfNGLAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_InventoryCurrentAndNoncurrent" name="InventoryCurrentAndNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_InventoryVolumesCurrent" name="InventoryVolumesCurrent" nillable="true" substitutionGroup="xbrli:item" type="num:volumeItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InventoryVolumesLinefillAndBaseGas" name="InventoryVolumesLinefillAndBaseGas" nillable="true" substitutionGroup="xbrli:item" type="num:volumeItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InventoryVolumesNoncurrent" name="InventoryVolumesNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="num:volumeItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InventoryWeightedAveragePricePerUnitCurrent" name="InventoryWeightedAveragePricePerUnitCurrent" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InventoryWeightedAveragePricePerUnitLinefillAndBaseGas" name="InventoryWeightedAveragePricePerUnitLinefillAndBaseGas" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_InventoryWeightedAveragePricePerUnitNoncurrent" name="InventoryWeightedAveragePricePerUnitNoncurrent" nillable="true" substitutionGroup="xbrli:item" type="us-types:perUnitItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_LandAndOtherMember" name="LandAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_LenderTypeAxis" name="LenderTypeAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_LenderTypeDomain" name="LenderTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LiabilitiesForOutstandingChecks" name="LiabilitiesForOutstandingChecks" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_LiabilityAwardsMember" name="LiabilityAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits" name="LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerEconomicOwnershipInterestConvertedIntoNonEconomicInterest" name="LimitedLiabilityCompanyLlcOrLimitedPartnershipLpManagingMemberOrGeneralPartnerEconomicOwnershipInterestConvertedIntoNonEconomicInterest" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnerCapitalAccountUnitsAgreedtoBeIssued" name="LimitedPartnerCapitalAccountUnitsAgreedtoBeIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountCommonUnitIssuance" name="LimitedPartnersCapitalAccountCommonUnitIssuance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedExchangedinExchangeRightExercises" name="LimitedPartnersCapitalAccountSharesIssuedExchangedinExchangeRightExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedFromConversion" name="LimitedPartnersCapitalAccountSharesIssuedFromConversion" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedFromSimplificationTransactions" name="LimitedPartnersCapitalAccountSharesIssuedFromSimplificationTransactions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedInExchange" name="LimitedPartnersCapitalAccountSharesIssuedInExchange" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedinRedemptionRightExercises" name="LimitedPartnersCapitalAccountSharesIssuedinRedemptionRightExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountSharesRedeemedinRedemptionRightExercises" name="LimitedPartnersCapitalAccountSharesRedeemedinRedemptionRightExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LimitedPartnersCapitalAccountUnitsIssuable" name="LimitedPartnersCapitalAccountUnitsIssuable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_Line901IncidentMember" name="Line901IncidentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_LineOfCreditAndCommercialPaperMember" name="LineOfCreditAndCommercialPaperMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" name="LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LinefillAndBaseGas" name="LinefillAndBaseGas" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_LongPositionOnNaturalGasContractsMember" name="LongPositionOnNaturalGasContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_LongPowerPositionForPowerSupplyRequirementsContractsMember" name="LongPowerPositionForPowerSupplyRequirementsContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LongTermDebtWeightedAverageMaturity" name="LongTermDebtWeightedAverageMaturity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LongTermInventoryCostingAdjustments" name="LongTermInventoryCostingAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_LossContingencyClaimsConsolidatedNumber" name="LossContingencyClaimsConsolidatedNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LossContingencyClaimsNotConsolidatedNumber" name="LossContingencyClaimsNotConsolidatedNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_LossContingencyPenaltyOrFineAssessed" name="LossContingencyPenaltyOrFineAssessed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pagp_LossContingencyPenaltyOrFineRecommended" name="LossContingencyPenaltyOrFineRecommended" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="pagp_LossOnDispositionOfAssetsAndAssetImpairmentCharges" name="LossOnDispositionOfAssetsAndAssetImpairmentCharges" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_MaintenanceCapital" name="MaintenanceCapital" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_MarathonPetroleumCorporationMember" name="MarathonPetroleumCorporationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_MesaToBasinPipelineReleaseMember" name="MesaToBasinPipelineReleaseMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_MinimumVolumeCommitmentAgreementsMember" name="MinimumVolumeCommitmentAgreementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NetCashPaidReceivedForTerminatedHedgingInstruments" name="NetCashPaidReceivedForTerminatedHedgingInstruments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_NetGainLossOnForeignCurrencyRevaluation" name="NetGainLossOnForeignCurrencyRevaluation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_NetLongPositionOnCrudeOilDerivativeContractsMember" name="NetLongPositionOnCrudeOilDerivativeContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NetProceedsFromRepaymentsOfHedgedInventoryFacility" name="NetProceedsFromRepaymentsOfHedgedInventoryFacility" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_NetShortPositionContractsRelatedToAnticipatedNetSalesOfInventoryMember" name="NetShortPositionContractsRelatedToAnticipatedNetSalesOfInventoryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_NetShortPositionRelatedToAnticipatedSalesOfNaturalGasInventoryAndBaseGasRequirementsMember" name="NetShortPositionRelatedToAnticipatedSalesOfNaturalGasInventoryAndBaseGasRequirementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_NetShortTimeSpreadPositionOnAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" name="NetShortTimeSpreadPositionOnAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NonCoreAssetsSoldNumber" name="NonCoreAssetsSoldNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NoncontrollingInterestIncreaseFromSubsidiaryPreferredUnitIssuance" name="NoncontrollingInterestIncreaseFromSubsidiaryPreferredUnitIssuance" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_NonextendingLenderMember" name="NonextendingLenderMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NumberOfAllegedRuleViolations" name="NumberOfAllegedRuleViolations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" name="NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" name="NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NumberOfDerivativesHeldWithCreditRiskRelatedContingentFeatures" name="NumberOfDerivativesHeldWithCreditRiskRelatedContingentFeatures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_NumberOfEmployeesChargedInIndictment" name="NumberOfEmployeesChargedInIndictment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NumberOfOccasionsFailedToCarryOutProgramAndProcedures" name="NumberOfOccasionsFailedToCarryOutProgramAndProcedures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_NumberOfOneYearExtensionsOfRevolvingCreditFacility" name="NumberOfOneYearExtensionsOfRevolvingCreditFacility" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OffsettingAssetsLiabilitiesLineItems" name="OffsettingAssetsLiabilitiesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OffsettingAssetsLiabilitiesTable" name="OffsettingAssetsLiabilitiesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OrganizationAndBasisOfPresentationLineItems" name="OrganizationAndBasisOfPresentationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_OtherAssetsNoncurrentGross" name="OtherAssetsNoncurrentGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_OtherConsolidatedEquityCompensationInformationAbstract" name="OtherConsolidatedEquityCompensationInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OtherInventoryMember" name="OtherInventoryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OtherLongTermDebtMember" name="OtherLongTermDebtMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OutstandingUnitsEarnedRollForward" name="OutstandingUnitsEarnedRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OutstandingUnitsRollForward" name="OutstandingUnitsRollForward" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_OxyMember" name="OxyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PaaCreditFacilitiesMember" name="PaaCreditFacilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PaaGPLLCMember" name="PaaGPLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PartnersCapitalAccountChangeInOwnershipInterest" name="PartnersCapitalAccountChangeInOwnershipInterest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_PartnersCapitalAccountPrivatePlacementOfUnitsTransactionFeeDueToPurchasersPercentage" name="PartnersCapitalAccountPrivatePlacementOfUnitsTransactionFeeDueToPurchasersPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PartnersCapitalAccountPublicSaleOfUnitsBySubsidiary" name="PartnersCapitalAccountPublicSaleOfUnitsBySubsidiary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_PartnersCapitalAccountSaleOfUnitsPricePerUnit" name="PartnersCapitalAccountSaleOfUnitsPricePerUnit" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PartnersCapitalAndDistributionLineItems" name="PartnersCapitalAndDistributionLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PartnersCapitalAndDistributionsTable" name="PartnersCapitalAndDistributionsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PartnersCapitalDeferredTaxAsset" name="PartnersCapitalDeferredTaxAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_PaymentsToAcquireEquityMethodInvestmentsWorkingCapitalAdjustment" name="PaymentsToAcquireEquityMethodInvestmentsWorkingCapitalAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_PercentageDistributionOfAvailableCash" name="PercentageDistributionOfAvailableCash" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_Phillips66CompanyMember" name="Phillips66CompanyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PipelineAndHazardousMaterialsSafetyAdministrationMember" name="PipelineAndHazardousMaterialsSafetyAdministrationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PipelineLossAllowanceCrudeOilLongCallOptionMember" name="PipelineLossAllowanceCrudeOilLongCallOptionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PipelineTariffActivitiesTruckingAndRelatedRevenues" name="PipelineTariffActivitiesTruckingAndRelatedRevenues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PipelineTariffActivitiesTruckingAndRelatedRevenuesMember" name="PipelineTariffActivitiesTruckingAndRelatedRevenuesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAapLPMember" name="PlainsAapLPMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmerican2013LongTermIncentivePlanMember" name="PlainsAllAmerican2013LongTermIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PlainsAllAmericanAndPNGLongTermIncentivePlansMember" name="PlainsAllAmericanAndPNGLongTermIncentivePlansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" name="PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmericanGPLLCMember" name="PlainsAllAmericanGPLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmericanLongTermIncentivePlansMember" name="PlainsAllAmericanLongTermIncentivePlansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" name="PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsAllAmericanPipelineLPMember" name="PlainsAllAmericanPipelineLPMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PlainsGPHoldingsLongTermIncentivePlansMember" name="PlainsGPHoldingsLongTermIncentivePlansMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PreferredDistributionRateResetOptionMember" name="PreferredDistributionRateResetOptionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsAnnualizedDistributionsPerUnit" name="PreferredUnitsAnnualizedDistributionsPerUnit" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsConversionRatio" name="PreferredUnitsConversionRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate" name="PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_PreferredUnitsPeriodAfterFifthAndSubsequentAnniversariesForDistributionRateReset" name="PreferredUnitsPeriodAfterFifthAndSubsequentAnniversariesForDistributionRateReset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsPeriodAfterWhichIssuerMayConvertToCommonUnits" name="PreferredUnitsPeriodAfterWhichIssuerMayConvertToCommonUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsPeriodAfterWhichUnitholdersMayConvertToCommonUnits" name="PreferredUnitsPeriodAfterWhichUnitholdersMayConvertToCommonUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PreferredUnitsQuarterlyDistributionsPerUnit" name="PreferredUnitsQuarterlyDistributionsPerUnit" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_PrepaidTariffCosts" name="PrepaidTariffCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_ProceedsFromSubsidiaryIssuanceOfCommonLimitedPartnersUnits" name="ProceedsFromSubsidiaryIssuanceOfCommonLimitedPartnersUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ProceedsFromSubsidiaryIssuanceOfPreferredLimitedPartnersUnits" name="ProceedsFromSubsidiaryIssuanceOfPreferredLimitedPartnersUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_PropertyTaxAbatementMember" name="PropertyTaxAbatementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_RailAndOtherTerminalAssetsMember" name="RailAndOtherTerminalAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ReductionInCashAvailableForDistribution" name="ReductionInCashAvailableForDistribution" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ReductionInIncentiveDistributions" name="ReductionInIncentiveDistributions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SLCPipelineLLCMember" name="SLCPipelineLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_STACKPipelineLLCMember" name="STACKPipelineLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SaddlehornPipelineCompanyLlcMember" name="SaddlehornPipelineCompanyLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SalesAndRelatedRevenues" name="SalesAndRelatedRevenues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SalesAndRelatedRevenuesMember" name="SalesAndRelatedRevenuesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ScheduleOfDebtInstrumentsTable" name="ScheduleOfDebtInstrumentsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" name="ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ScheduleOfLongTermIncentivePlanAwardsOutstandingAndExpectedToVestTableTextBlock" name="ScheduleOfLongTermIncentivePlanAwardsOutstandingAndExpectedToVestTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ScheduleOfOffsettingAssetsAndLiabilitiesTableTextBlock" name="ScheduleOfOffsettingAssetsAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAmortizationTableTextBlock" name="ScheduleOfShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAmortizationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SecuritiesLawClassActionLawsuitsMember" name="SecuritiesLawClassActionLawsuitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SegmentAdjustedEBITDA" name="SegmentAdjustedEBITDA" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SegmentFacilitiesMember" name="SegmentFacilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SegmentSupplyAndLogisticsMember" name="SegmentSupplyAndLogisticsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SegmentTransportationMember" name="SegmentTransportationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInAugust2016At5.88PercentMember" name="SeniorNotesDueInAugust2016At5.88PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInDecember2019At2.60PercentMember" name="SeniorNotesDueInDecember2019At2.60PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInFebruary2021At5.00PercentMember" name="SeniorNotesDueInFebruary2021At5.00PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInFebruary2045At4.90PercentMember" name="SeniorNotesDueInFebruary2045At4.90PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJanuary2017At6.13PercentMember" name="SeniorNotesDueInJanuary2017At6.13PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJanuary2020At5.75PercentMember" name="SeniorNotesDueInJanuary2020At5.75PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJanuary2023At2.85PercentMember" name="SeniorNotesDueInJanuary2023At2.85PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJanuary2037At6.65PercentMember" name="SeniorNotesDueInJanuary2037At6.65PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJanuary2043At4.30PercentMember" name="SeniorNotesDueInJanuary2043At4.30PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJune2015At5.25PercentMember" name="SeniorNotesDueInJune2015At5.25PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJune2022At3.65PercentMember" name="SeniorNotesDueInJune2022At3.65PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJune2042At5.15PercentMember" name="SeniorNotesDueInJune2042At5.15PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInJune2044At4.70PercentMember" name="SeniorNotesDueInJune2044At4.70PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInMay2018At6.50PercentMember" name="SeniorNotesDueInMay2018At6.50PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInMay2019At8.75PercentMember" name="SeniorNotesDueInMay2019At8.75PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInMay2036At6.70PercentMember" name="SeniorNotesDueInMay2036At6.70PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInNovember2024At3.60PercentMember" name="SeniorNotesDueInNovember2024At3.60PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInOctober2023At3.85PercentMember" name="SeniorNotesDueInOctober2023At3.85PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInOctober2025At4.65PercentMember" name="SeniorNotesDueInOctober2025At4.65PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueInSeptember2015At3.95PercentMember" name="SeniorNotesDueInSeptember2015At3.95PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorNotesDueinDecember2026At4.50PercentMember" name="SeniorNotesDueinDecember2026At4.50PercentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SeniorNotesPublicOfferingPrice" name="SeniorNotesPublicOfferingPrice" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_SeniorSecuredHedgedInventoryFacilityMember" name="SeniorSecuredHedgedInventoryFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorUnsecured364DayRevolvingCreditFacilityMember" name="SeniorUnsecured364DayRevolvingCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeniorUnsecuredRevolvingCreditFacilityMember" name="SeniorUnsecuredRevolvingCreditFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeriesaConvertiblePreferredUnitsMember" name="SeriesaConvertiblePreferredUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SeriesaPreferredUnitsMember" name="SeriesaPreferredUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SettoonTowingLLCMember" name="SettoonTowingLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedUnitsConvertedinPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEarnedUnitsConvertedinPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriodGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConvertedInPeriodGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantedInPeriodGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsEarnedNumber" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsEarnedNumber" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedinPeriodGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedinPeriodGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstanding" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalExpectedToVest" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsTotalExpectedToVest" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnitsEarnedOutstanding" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnitsEarnedOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalSettlementFairValue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearFour" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearFour" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearOne" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearOne" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearThree" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearThree" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearTwo" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingInYearTwo" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingThereafter" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingThereafter" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestedInPeriodSettledInCash" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesVestedInPeriodSettledInCash" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardVestedInPeriodCashSettled" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnearnedUnits" name="ShareBasedCompensationArrangementbyShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsUnearnedUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansAnnualizedDistributionLevelRequiredForUnearnedAwardsToBecomeEarned" name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansAnnualizedDistributionLevelRequiredForUnearnedAwardsToBecomeEarned" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansAnnualizedDistributionLevelRequiredForVesting" name="ShareBasedCompensationSharesOutstandingUnderEquityCompensationPlansAnnualizedDistributionLevelRequiredForVesting" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedinPeriod" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsModifiedinPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsModifiedWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsModifiedWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SharesClassBMember" name="SharesClassBMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SharesClassCMember" name="SharesClassCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SharesClassMember" name="SharesClassMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ShortButanePositionContractsRelatedToSubsequentSaleOfProductMember" name="ShortButanePositionContractsRelatedToSubsequentSaleOfProductMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ShortPropanePositionContractsRelatedToSubsequentSaleOfProductMember" name="ShortPropanePositionContractsRelatedToSubsequentSaleOfProductMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_ShortWTIPositionContractsRelatedToSubsequentSaleOfProductMember" name="ShortWTIPositionContractsRelatedToSubsequentSaleOfProductMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" name="SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_SimplificationAgreementMember" name="SimplificationAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_StandbyLettersOfCreditReceived" name="StandbyLettersOfCreditReceived" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_StorageTerminalAndRailFacilitiesMember" name="StorageTerminalAndRailFacilitiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_StorageTerminallingProcessingAndRelatedRevenues" name="StorageTerminallingProcessingAndRelatedRevenues" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="pagp_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestUnits" name="SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestUnits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_ThirdPartyEnvironmentalRecoveriesReceivedAndReceivable" name="ThirdPartyEnvironmentalRecoveriesReceivedAndReceivable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_TradeAccountsReceivableAndOtherReceivablesMember" name="TradeAccountsReceivableAndOtherReceivablesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastScheduledInvoiceDate" name="TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastScheduledInvoiceDate" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_TruckingEquipmentAndOtherMember" name="TruckingEquipmentAndOtherMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_USTreasuryRateMember" name="USTreasuryRateMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="pagp_UnderwrittenOfferingMember" name="UnderwrittenOfferingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_UnitConversionRatio" name="UnitConversionRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_UnitholderDerivativeLawsuitsMember" name="UnitholderDerivativeLawsuitsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="pagp_UnitsThatWouldHaveVestedBasedOnPassageOfTimeButWillVestEarlierFollowingModification" name="UnitsThatWouldHaveVestedBasedOnPassageOfTimeButWillVestEarlierFollowingModification" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_UnitsToBeIssued" name="UnitsToBeIssued" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="instant" />
  <xsd:element id="pagp_VariationMarginPostedReturned" name="VariationMarginPostedReturned" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="pagp_WhiteCliffsPipelineLlcMember" name="WhiteCliffsPipelineLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
