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  <xs:element id="pagp_InventoryWriteDownNoncurrent" abstract="false" name="InventoryWriteDownNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ClassActionLawsuitsMember" abstract="true" name="ClassActionLawsuitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesDueInNovember2024At360PercentMember" abstract="true" name="SeniorNotesDueInNovember2024At360PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDueInTwoYears" abstract="false" name="LeasesFutureMinimumPaymentsDueInTwoYears" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PlainsAapLPMember" abstract="true" name="PlainsAapLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_GOZoneTermLoanSeries2009Member" abstract="true" name="GOZoneTermLoanSeries2009Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PartnersCapitalNoteAbstract" abstract="true" name="PartnersCapitalNoteAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember" abstract="true" name="IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CaplinePipelineCompanyLLCMember" abstract="true" name="CaplinePipelineCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PublicUnitHoldersMember" abstract="true" name="PublicUnitHoldersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ContractWithCustomerAssetAndLiabilityLineItems" abstract="true" name="ContractWithCustomerAssetAndLiabilityLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_UnitholderDerivativeLawsuitsMember" abstract="true" name="UnitholderDerivativeLawsuitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PlainsAllAmericanPipelineLPMember" abstract="true" name="PlainsAllAmericanPipelineLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PinePrairieAndSouthernPinesNaturalGasStorageFacilitiesMember" abstract="true" name="PinePrairieAndSouthernPinesNaturalGasStorageFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_StorageTerminalAndRailFacilitiesMember" abstract="true" name="StorageTerminalAndRailFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_InventoryCurrentAndNoncurrent" abstract="false" name="InventoryCurrentAndNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_CommonUnitsAndSeriesAPreferredUnitsMember" abstract="true" name="CommonUnitsAndSeriesAPreferredUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits" abstract="false" name="EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_SeniorNotesDueInSeptember2030At380PercentMember" abstract="true" name="SeniorNotesDueInSeptember2030At380PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ContractWithCustomerContractualRightsOfOffsetWithCounterparties" abstract="false" name="ContractWithCustomerContractualRightsOfOffsetWithCounterparties" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" abstract="false" name="LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pagp_InitialMargin" abstract="false" name="InitialMargin" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LeaseWeightedAverageRemainingLeaseTermAbstract" abstract="true" name="LeaseWeightedAverageRemainingLeaseTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDueInThreeYear" abstract="false" name="LeasesFutureMinimumPaymentsDueInThreeYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementAnnualAvailableCashDomain" abstract="true" name="ModifiedSharingArrangementAnnualAvailableCashDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_UnitConversionRatio" abstract="false" name="UnitConversionRatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_AgreementsToUtilizeAssetsOfEquityMethodInvesteeMember" abstract="true" name="AgreementsToUtilizeAssetsOfEquityMethodInvesteeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNet" abstract="false" name="GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PercentageDistributionOfAvailableCash" abstract="false" name="PercentageDistributionOfAvailableCash" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" abstract="false" name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pagp_PropaneContractsRelatedToSubsequentSaleOfProductMember" abstract="true" name="PropaneContractsRelatedToSubsequentSaleOfProductMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" abstract="false" name="IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsButAfterDeductingIncomeAndTaxesAttributableToNoncontrollingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedFromConversion" abstract="false" name="LimitedPartnersCapitalAccountSharesIssuedFromConversion" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_ChangeInContractWithCustomerLiabilityRollForward" abstract="true" name="ChangeInContractWithCustomerLiabilityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LossOnDispositionOfAssets" abstract="false" name="LossOnDispositionOfAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_GOZoneTermLoanSeries2010Member" abstract="true" name="GOZoneTermLoanSeries2010Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EquityMethodInvestmentOwnershipPercentageSold" abstract="false" name="EquityMethodInvestmentOwnershipPercentageSold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_ContractWithCustomerCounterpartyDeficienciesTableTextBlock" abstract="false" name="ContractWithCustomerCounterpartyDeficienciesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pagp_ScheduleOfModifiedRevenueSharingArrangementTableTextBlock" abstract="false" name="ScheduleOfModifiedRevenueSharingArrangementTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pagp_UndividedJointInterestInCaplinePipelineSystemMember" abstract="true" name="UndividedJointInterestInCaplinePipelineSystemMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ConsolidatedFinanceSubsidiaryIssuerMember" abstract="true" name="ConsolidatedFinanceSubsidiaryIssuerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LosAngelesBasinCrudeOilTerminalsMember" abstract="true" name="LosAngelesBasinCrudeOilTerminalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DeferredTaxAssetsInvestmentsInSubsidiaries" abstract="false" name="DeferredTaxAssetsInvestmentsInSubsidiaries" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_InvestmentAndAcquisitionCapitalExpenditures" abstract="false" name="InvestmentAndAcquisitionCapitalExpenditures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ModifiedRevenueArrangementAnnualAvailableCashBetween428MillionTo815MillionMember" abstract="true" name="ModifiedRevenueArrangementAnnualAvailableCashBetween428MillionTo815MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CapitalContributionsToEquityMethodInvestees" abstract="false" name="CapitalContributionsToEquityMethodInvestees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_STACKPipelineLLCMember" abstract="true" name="STACKPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementMember" abstract="true" name="ModifiedSharingArrangementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DistributionPercentageAfterTerminationOfModifiedSharingArrangement" abstract="false" name="DistributionPercentageAfterTerminationOfModifiedSharingArrangement" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_InventoryVolumesLinefillAndBaseGas" abstract="false" name="InventoryVolumesLinefillAndBaseGas" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestmentInUnconsolidatedEntities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestmentInUnconsolidatedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_RedOakPiplelineLLCMember" abstract="true" name="RedOakPiplelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OffsettingAssetsLiabilitiesLineItems" abstract="true" name="OffsettingAssetsLiabilitiesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_OtherEquityMethodInvestmentMember" abstract="true" name="OtherEquityMethodInvestmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementDistributionPercentage" abstract="false" name="ModifiedSharingArrangementDistributionPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_PlainsOryxPermianBasinLLCMember" abstract="true" name="PlainsOryxPermianBasinLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_MinimumVolumeCommitmentAgreementsMember" abstract="true" name="MinimumVolumeCommitmentAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AAPUnitsMember" abstract="true" name="AAPUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_InventoryWeightedAveragePricePerUnitNoncurrent" abstract="false" name="InventoryWeightedAveragePricePerUnitNoncurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="pagp_TruckingEquipmentAndOtherMember" abstract="true" name="TruckingEquipmentAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest" abstract="false" name="CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDueInFourYears" abstract="false" name="LeasesFutureMinimumPaymentsDueInFourYears" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_IndictmentNumberofFelonyChargesGuiltyVerdict" abstract="false" name="IndictmentNumberofFelonyChargesGuiltyVerdict" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="pagp_ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" abstract="true" name="ComputationOfBasicAndDilutedEarningsPerLimitedPartnerUnitTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_OMOGJVLLCMember" abstract="true" name="OMOGJVLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_GainsLossesFromDerivativeActivitiesNetofInventoryValuationAdjustments" abstract="false" name="GainsLossesFromDerivativeActivitiesNetofInventoryValuationAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OtherLeaseCost" abstract="false" name="OtherLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_CrudeOilStorageTerminalAssetsMember" abstract="true" name="CrudeOilStorageTerminalAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesDueInJanuary2037At665PercentMember" abstract="true" name="SeniorNotesDueInJanuary2037At665PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" abstract="false" name="DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_IndictmentNumberofMisdemeanorChargesGuiltyVerdictReportingCount" abstract="false" name="IndictmentNumberofMisdemeanorChargesGuiltyVerdictReportingCount" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="pagp_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_ConsentDecreeCivilPenaltiesMember" abstract="true" name="ConsentDecreeCivilPenaltiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesDueInJanuary2043At430PercentMember" abstract="true" name="SeniorNotesDueInJanuary2043At430PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" abstract="false" name="ScheduleOfInventoryLinefillAndBaseGasAndLongTermInventoryTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pagp_MeasurementInputMarketMultipleMember" abstract="true" name="MeasurementInputMarketMultipleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ScheduleOfDebtInstrumentsTable" abstract="true" name="ScheduleOfDebtInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementAnnualAvailableCashUpTo300MillionMember" abstract="true" name="ModifiedSharingArrangementAnnualAvailableCashUpTo300MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ExchangeOfAapUnitsAndClassBSharesForClassaSharesMember" abstract="true" name="ExchangeOfAapUnitsAndClassBSharesForClassaSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_NaturalGasLiquidsSegmentMember" abstract="true" name="NaturalGasLiquidsSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BridgeTexPipelineCompanyLLCMember" abstract="true" name="BridgeTexPipelineCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember" abstract="true" name="GainsLossesOnAssetSalesAndAssetImpairmentsNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDueThereafter" abstract="false" name="LeasesFutureMinimumPaymentsDueThereafter" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_Phillips66CompanyMember" abstract="true" name="Phillips66CompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AnticipatedNetSalesOfInventoryMember" abstract="true" name="AnticipatedNetSalesOfInventoryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ProceedsFromSaleOfProductiveAssetsAndAgreements" abstract="false" name="ProceedsFromSaleOfProductiveAssetsAndAgreements" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ButaneContractsRelatedToSubsequentSaleOfProductMember" abstract="true" name="ButaneContractsRelatedToSubsequentSaleOfProductMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementAnnualAvailableCash815MillionAndAboveMember" abstract="true" name="ModifiedSharingArrangementAnnualAvailableCash815MillionAndAboveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OffsettingAssetsLiabilitiesTable" abstract="true" name="OffsettingAssetsLiabilitiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LongTermInventoryCostingAdjustments" abstract="false" name="LongTermInventoryCostingAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OtherDebtMember" abstract="true" name="OtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LesseeLeasesTermOfContract" abstract="false" name="LesseeLeasesTermOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pagp_FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" abstract="false" name="FieldOperatingCostsAndGeneralAndAdministrativeExpensesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="pagp_MaintenanceCapitalExpenditures" abstract="false" name="MaintenanceCapitalExpenditures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_CrudeOilSalesAgreementsEnteredIntoInConjunctionWIthStorageArrangementsAndFutureInventoryExchangesMember" abstract="true" name="CrudeOilSalesAgreementsEnteredIntoInConjunctionWIthStorageArrangementsAndFutureInventoryExchangesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SharesClassCMember" abstract="true" name="SharesClassCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorUnsecuredRevolvingCreditFacilityMember" abstract="true" name="SeniorUnsecuredRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PartnersCapitalAndDistributionsTable" abstract="true" name="PartnersCapitalAndDistributionsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_SeniorNotesDueInJune2022At365PercentMember" abstract="true" name="SeniorNotesDueInJune2022At365PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_CounterpartyDeficiencies" abstract="false" name="CounterpartyDeficiencies" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_AssetExchangeTransactionMember" abstract="true" name="AssetExchangeTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" abstract="true" name="PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember" abstract="true" name="GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OrganizationConsolidationAndPresentationOfFinancialStatementsTable" abstract="true" name="OrganizationConsolidationAndPresentationOfFinancialStatementsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDueInOneYear" abstract="false" name="LeasesFutureMinimumPaymentsDueInOneYear" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ForeignTaxRate" abstract="false" name="ForeignTaxRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_GainOnDispositionOfAssets" abstract="false" name="GainOnDispositionOfAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LinefillAndBaseGas" abstract="false" name="LinefillAndBaseGas" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_InventoryVolumesCurrent" abstract="false" name="InventoryVolumesCurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_OrganizationAndBasisOfPresentationLineItems" abstract="true" name="OrganizationAndBasisOfPresentationLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_AcquisitionMeasurementPeriodThreshold" abstract="false" name="AcquisitionMeasurementPeriodThreshold" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_DeficienciesUnderMinimumVolumeCommitmentsNet" abstract="false" name="DeficienciesUnderMinimumVolumeCommitmentsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_NumberOfStraddlePlantsAdditionalInterestsAcquired" abstract="false" name="NumberOfStraddlePlantsAdditionalInterestsAcquired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="pagp_CounterpartyDeficienciesUnbilledAndUncollected" abstract="false" name="CounterpartyDeficienciesUnbilledAndUncollected" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LineOfCreditAndCommercialPaperMember" abstract="true" name="LineOfCreditAndCommercialPaperMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorSecuredHedgedInventoryFacilityMember" abstract="true" name="SeniorSecuredHedgedInventoryFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BPPlcAndSubsidiariesMember" abstract="true" name="BPPlcAndSubsidiariesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CanadianTaxAuthoritiesMember" abstract="true" name="CanadianTaxAuthoritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AdjustedEBITDAAttributableToNoncontrollingInterestsInConsolidatedJointVentures" abstract="false" name="AdjustedEBITDAAttributableToNoncontrollingInterestsInConsolidatedJointVentures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PlainsGPHoldingsLPMember" abstract="true" name="PlainsGPHoldingsLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_UndividedJointInterestOwnershipPercentage" abstract="false" name="UndividedJointInterestOwnershipPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_AAPManagementUnitsMember" abstract="true" name="AAPManagementUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PlainsGPHoldingsLongTermIncentivePlansMember" abstract="true" name="PlainsGPHoldingsLongTermIncentivePlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_Line901IncidentMember" abstract="true" name="Line901IncidentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ThirdPartyEnvironmentalRecoveriesReceivedAndReceivable" abstract="false" name="ThirdPartyEnvironmentalRecoveriesReceivedAndReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_CrudeOilSegmentMember" abstract="true" name="CrudeOilSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DepreciationAndAmortizationOfUnconsolidatedEntities" abstract="false" name="DepreciationAndAmortizationOfUnconsolidatedEntities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PlainsAllAmerican2021LongTermIncentivePlanMember" abstract="true" name="PlainsAllAmerican2021LongTermIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_InventoryWeightedAveragePricePerUnitCurrent" abstract="false" name="InventoryWeightedAveragePricePerUnitCurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="pagp_NorthDakotaStorageTerminalsMember" abstract="true" name="NorthDakotaStorageTerminalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EagleFordPipelineLLCMember" abstract="true" name="EagleFordPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CommonEquityRepurchaseProgramMember" abstract="true" name="CommonEquityRepurchaseProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_VariationMarginPostedReturned" abstract="false" name="VariationMarginPostedReturned" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" abstract="true" name="InventoryLinefillAndBaseGasAndLongTermInventoryDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_CommonUnitsMember" abstract="true" name="CommonUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_NGLTerminalsMember" abstract="true" name="NGLTerminalsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OtherInventoryMember" abstract="true" name="OtherInventoryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_FMGatheringLLCMember" abstract="true" name="FMGatheringLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LandAndOtherMember" abstract="true" name="LandAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesPublicOfferingPrice" abstract="false" name="SeniorNotesPublicOfferingPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_MarathonPetroleumCorporationMember" abstract="true" name="MarathonPetroleumCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember" abstract="true" name="TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementAnnualAvailableCashBetween300MillionTo428MillionMember" abstract="true" name="ModifiedSharingArrangementAnnualAvailableCashBetween300MillionTo428MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BusinessCombinationProFormaNetIncomeLossAttributableToTheParent" abstract="false" name="BusinessCombinationProFormaNetIncomeLossAttributableToTheParent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ExxonMobilCorporationMember" abstract="true" name="ExxonMobilCorporationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_StonepeakInfrastructurePartnersAffiliatesMember" abstract="true" name="StonepeakInfrastructurePartnersAffiliatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_FieldOperatingCostsMember" abstract="true" name="FieldOperatingCostsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LeasesFutureMinimumPaymentsDue" abstract="false" name="LeasesFutureMinimumPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PowerSupplyRequirementsContractsMember" abstract="true" name="PowerSupplyRequirementsContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_NetGainLossOnForeignCurrencyRevaluation" abstract="false" name="NetGainLossOnForeignCurrencyRevaluation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OtherLongTermDebtMember" abstract="true" name="OtherLongTermDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedRedeemedinRedemptionRightExercises" abstract="false" name="LimitedPartnersCapitalAccountSharesIssuedRedeemedinRedemptionRightExercises" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_BasicAndDilutedEarningsPerShareLineItems" abstract="true" name="BasicAndDilutedEarningsPerShareLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_ModifiedSharingArrangementAnnualAvailableCashAxis" abstract="true" name="ModifiedSharingArrangementAnnualAvailableCashAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_CrudeOilTerminalMember" abstract="true" name="CrudeOilTerminalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EightForwardStartingThirtyYearInterestRateSwaps073PercentMember" abstract="true" name="EightForwardStartingThirtyYearInterestRateSwaps073PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SaddlehornPipelineCompanyLlcMember" abstract="true" name="SaddlehornPipelineCompanyLlcMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ContractWithCustomerAssetAndLiabilityTable" abstract="true" name="ContractWithCustomerAssetAndLiabilityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_BusinessCombinationMeasurementInput" abstract="false" name="BusinessCombinationMeasurementInput" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLinefill" abstract="false" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLinefill" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestUnits" abstract="false" name="SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterestUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_SeniorNotesDueInJune2044At470PercentMember" abstract="true" name="SeniorNotesDueInJune2044At470PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AdditionalInterestsInStraddlePlantsMember" abstract="true" name="AdditionalInterestsInStraddlePlantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ConversionOfAapManagementUnitsIntoAapUnitsMember" abstract="true" name="ConversionOfAapManagementUnitsIntoAapUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAMaximum" abstract="false" name="DebtInstrumentCoverageRatioDebtToEBITDAMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_SeniorNotesDueInOctober2023At385PercentMember" abstract="true" name="SeniorNotesDueInOctober2023At385PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" abstract="true" name="PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ConsentDecreeCompensationForInjuriesToDestructionOfLossOfUseOfNaturalResourcesMember" abstract="true" name="ConsentDecreeCompensationForInjuriesToDestructionOfLossOfUseOfNaturalResourcesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesDueInDecember2019At2.60PercentMember" abstract="true" name="SeniorNotesDueInDecember2019At2.60PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_JointVentureFormationMember" abstract="true" name="JointVentureFormationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PartnersCapitalAndDistributionLineItems" abstract="true" name="PartnersCapitalAndDistributionLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_PartnersCapitalDeferredTaxAsset" abstract="false" name="PartnersCapitalDeferredTaxAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_AOCIOtherIncludingPortionAttributabletoNoncontrollingInterestMember" abstract="true" name="AOCIOtherIncludingPortionAttributabletoNoncontrollingInterestMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" abstract="false" name="SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_FourthQuarterDistributionMember" abstract="true" name="FourthQuarterDistributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EstimatedSizeOfReleaseToReachBodyOfWater" abstract="false" name="EstimatedSizeOfReleaseToReachBodyOfWater" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_CrudeOilGradeBasisPositionMember" abstract="true" name="CrudeOilGradeBasisPositionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EstimatedSizeOfRelease" abstract="false" name="EstimatedSizeOfRelease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_SeniorNotesDueInJune2042At515PercentMember" abstract="true" name="SeniorNotesDueInJune2042At515PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OryxMidstreamHoldingsLLCMember" abstract="true" name="OryxMidstreamHoldingsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SeniorNotesDueInDecember2029At355PercentMember" abstract="true" name="SeniorNotesDueInDecember2029At355PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DeferredStateandLocalIncomeTaxExpenseBenefitNetofFederalBenefitExpense" abstract="false" name="DeferredStateandLocalIncomeTaxExpenseBenefitNetofFederalBenefitExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LongTermDebtWeightedAverageMaturity" abstract="false" name="LongTermDebtWeightedAverageMaturity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pagp_SharesClassAMember" abstract="true" name="SharesClassAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PipelineAndRelatedFacilitiesAndStorageTerminalAndRailFacilitiesMember" abstract="true" name="PipelineAndRelatedFacilitiesAndStorageTerminalAndRailFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LossContingencyPenaltyOrFineAssessed" abstract="false" name="LossContingencyPenaltyOrFineAssessed" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
