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  <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_TransportationRevenueMember" abstract="true" name="TransportationRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_TerminallingStorageAndOtherRevenueMember" abstract="true" name="TerminallingStorageAndOtherRevenueMember" 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_MinimumVolumeCommitmentAgreementsMember" abstract="true" name="MinimumVolumeCommitmentAgreementsMember" 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_ChangeInContractWithCustomerLiabilityRollForward" abstract="true" name="ChangeInContractWithCustomerLiabilityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_ContractwithCustomerLiabilityAdditions" abstract="false" name="ContractwithCustomerLiabilityAdditions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_ContractwithCustomerLiabilityOther" abstract="false" name="ContractwithCustomerLiabilityOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndCapacityAgreementsMember" abstract="true" name="PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndCapacityAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_TerminallingStorageAndOtherAgreementRevenuesMember" abstract="true" name="TerminallingStorageAndOtherAgreementRevenuesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastInvoiceDate" abstract="false" name="TradeAccountsReceivableNetDisclosureOfMaximumAgeOfBalancesPastInvoiceDate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerClassAShareTable" abstract="true" name="ScheduleOfCalculationOfBasicAndDilutedNetIncomePerClassAShareTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
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  <xs:element id="pagp_BasicAndDilutedEarningsPerShareLineItems" abstract="true" name="BasicAndDilutedEarningsPerShareLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <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_InventoryVolumesCurrent" abstract="false" name="InventoryVolumesCurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_InventoryVolumesLinefill" abstract="false" name="InventoryVolumesLinefill" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <xs:element id="pagp_InventoryVolumesNoncurrent" abstract="false" name="InventoryVolumesNoncurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:volumeItemType"/>
  <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_InventoryWeightedAveragePricePerUnitCurrent" abstract="false" name="InventoryWeightedAveragePricePerUnitCurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="pagp_InventoryWeightedAveragePricePerUnitLinefill" abstract="false" name="InventoryWeightedAveragePricePerUnitLinefill" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
  <xs:element id="pagp_InventoryWeightedAveragePricePerUnitNoncurrent" abstract="false" name="InventoryWeightedAveragePricePerUnitNoncurrent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="srt-types:perUnitItemType"/>
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  <xs:element id="pagp_NGLStorageTerminalFractionationAndProcessingFacilitiesMember" abstract="true" name="NGLStorageTerminalFractionationAndProcessingFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OfficePropertyAndEquipmentAndRollingStockMember" abstract="true" name="OfficePropertyAndEquipmentAndRollingStockMember" 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_EPICCrudeOilPipelineMember" abstract="true" name="EPICCrudeOilPipelineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EarnoutConsiderationMember" abstract="true" name="EarnoutConsiderationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_EPICCreditAgreementMember" abstract="true" name="EPICCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BusinessCombinationConsiderationTransferredCashAndWorkingCapital" abstract="false" name="BusinessCombinationConsiderationTransferredCashAndWorkingCapital" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_BusinessCombinationMeasurementInput" abstract="false" name="BusinessCombinationMeasurementInput" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="pagp_IronwoodMidstreamEnergyPartnersIILLCMember" abstract="true" name="IronwoodMidstreamEnergyPartnersIILLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OMOGJVLLCAndSouthernDelawareGatheringAssetsMember" abstract="true" name="OMOGJVLLCAndSouthernDelawareGatheringAssetsMember" 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_BusinessCombinationProFormaNetIncomeLossAttributableToTheParent" abstract="false" name="BusinessCombinationProFormaNetIncomeLossAttributableToTheParent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="pagp_RattlerMidstreamOperatingLLCMember" abstract="true" name="RattlerMidstreamOperatingLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_PlainsOryxPermianBasinLLCMember" abstract="true" name="PlainsOryxPermianBasinLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_BusinessCombinationConsiderationTransferredNetToOwnershipInterest" abstract="false" name="BusinessCombinationConsiderationTransferredNetToOwnershipInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="pagp_BlackKnightMidstreamLLCMember" abstract="true" name="BlackKnightMidstreamLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_MidwayPipelineLLCMember" abstract="true" name="MidwayPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SaddlehornPipelineCompanyLLCMember" abstract="true" name="SaddlehornPipelineCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SubsidiaryOfLMEnergyPartnersMember" abstract="true" name="SubsidiaryOfLMEnergyPartnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PipelineAndTerminationTerminalAssetsMember" abstract="true" name="PipelineAndTerminationTerminalAssetsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_NorthernDelawareBasinGatheringSystemMember" abstract="true" name="NorthernDelawareBasinGatheringSystemMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AssetAcquisitionConsiderationTransferredNetToOwnershipInterest" abstract="false" name="AssetAcquisitionConsiderationTransferredNetToOwnershipInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_KeyeraFortSaskatchewanFacilityMember" abstract="true" name="KeyeraFortSaskatchewanFacilityMember" 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_NonOperatedUndividedJointInterestOwnershipPercentageSold" abstract="false" name="NonOperatedUndividedJointInterestOwnershipPercentageSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_CaplinePipelineCompanyLLCMember" abstract="true" name="CaplinePipelineCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <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_EagleFordTerminalsCorpusChristiLLCMember" abstract="true" name="EagleFordTerminalsCorpusChristiLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_WhiteCliffsPipelineL.L.CMember" abstract="true" name="WhiteCliffsPipelineL.L.CMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_OtherEquityMethodInvestmentMember" abstract="true" name="OtherEquityMethodInvestmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest" abstract="false" name="CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="pagp_OtherDebtMember" abstract="true" name="OtherDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SeniorNotesDueInSeptember2030At380PercentMember" abstract="true" name="SeniorNotesDueInSeptember2030At380PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SeniorNotesDueInJanuary2037At665PercentMember" abstract="true" name="SeniorNotesDueInJanuary2037At665PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SeniorNotesDueInFebruary2045At490PercentMember" abstract="true" name="SeniorNotesDueInFebruary2045At490PercentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <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_NumberOfOneYearExtensionsProvidedForUnderAgreement" abstract="false" name="NumberOfOneYearExtensionsProvidedForUnderAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="pagp_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" abstract="false" name="LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
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  <xs:element id="pagp_VariableRateComponentDomain" abstract="true" name="VariableRateComponentDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_FirstAnniversaryOfTheClosingDateMember" abstract="true" name="FirstAnniversaryOfTheClosingDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_AfterTheFirstAnniversaryOfTheClosingDateMember" abstract="true" name="AfterTheFirstAnniversaryOfTheClosingDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LongTermDebtMandatoryPrepaymentDuration" abstract="false" name="LongTermDebtMandatoryPrepaymentDuration" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_SeniorNotesDueInJanuary2031At4.70PercentWith99.872PercentOfFaceValueMember" abstract="true" name="SeniorNotesDueInJanuary2031At4.70PercentWith99.872PercentOfFaceValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="pagp_SeniorNotesDueInSeptember2034At5.70PercentWith99.953PercentOfFaceValueMember" abstract="true" name="SeniorNotesDueInSeptember2034At5.70PercentWith99.953PercentOfFaceValueMember" 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_SeniorNotesPublicOfferingPrice" abstract="false" name="SeniorNotesPublicOfferingPrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_LongTermDebtWeightedAverageMaturity" abstract="false" name="LongTermDebtWeightedAverageMaturity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_DebtInstrumentCoverageRatioDebtToEBITDAMaximum" abstract="false" name="DebtInstrumentCoverageRatioDebtToEBITDAMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" abstract="false" name="DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <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_ExchangeOfAAPUnitsAndClassBSharesForClassASharesMember" abstract="true" name="ExchangeOfAAPUnitsAndClassBSharesForClassASharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_SharesClassBMember" abstract="true" name="SharesClassBMember" 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_CommonEquityRepurchaseProgramMember" abstract="true" name="CommonEquityRepurchaseProgramMember" 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_LimitedPartnersCapitalAccountSharesIssuedFromConversion" abstract="false" name="LimitedPartnersCapitalAccountSharesIssuedFromConversion" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedExchangedinExchangeRightExercises" abstract="false" name="LimitedPartnersCapitalAccountSharesIssuedExchangedinExchangeRightExercises" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_LimitedPartnersCapitalAccountSharesIssuedRedeemedinRedemptionRightExercises" abstract="false" name="LimitedPartnersCapitalAccountSharesIssuedRedeemedinRedemptionRightExercises" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_PartnersCapitalAccountSharesCancellationOfShares" abstract="false" name="PartnersCapitalAccountSharesCancellationOfShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="pagp_PartnersCapitalUnitsOther" abstract="false" name="PartnersCapitalUnitsOther" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <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_NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" abstract="false" name="NumberOfDaysRequiredForDistributionToShareholdersAfterEndOfQuarter" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pagp_CactusIIPipelineLLCMember" abstract="true" name="CactusIIPipelineLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_RedRiverPipelineCompanyLLCMember" abstract="true" name="RedRiverPipelineCompanyLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_PublicUnitHoldersMember" abstract="true" name="PublicUnitHoldersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PartnersCapitalAndDistributionsLineItems" abstract="true" name="PartnersCapitalAndDistributionsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate" abstract="false" name="PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_PreferredUnitsDistributionRate" abstract="false" name="PreferredUnitsDistributionRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_PreferredUnitsAnnualizedDistributionsPerUnit" abstract="false" name="PreferredUnitsAnnualizedDistributionsPerUnit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="pagp_PreferredUnitsPercentageOfUnitsOutstandingRepurchased" abstract="false" name="PreferredUnitsPercentageOfUnitsOutstandingRepurchased" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="pagp_PreferredUnitDistributionPercentageSpread" abstract="false" name="PreferredUnitDistributionPercentageSpread" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_PreferredUnitDistributionPercentageCreditSpreadAdjustment" abstract="false" name="PreferredUnitDistributionPercentageCreditSpreadAdjustment" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" abstract="false" name="NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="pagp_ConsolidatedJointVentureEntitiesMember" abstract="true" name="ConsolidatedJointVentureEntitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_ContractsRelatedToCrudeOilPurchasesMember" abstract="true" name="ContractsRelatedToCrudeOilPurchasesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_TimeSpreadOnHedgeAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" abstract="true" name="TimeSpreadOnHedgeAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CrudeOilBasisSpreadPositionMember" abstract="true" name="CrudeOilBasisSpreadPositionMember" 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_PowerSupplyRequirementsContractsMember" abstract="true" name="PowerSupplyRequirementsContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_RevenuesMember" abstract="true" name="RevenuesMember" 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_InitialMargin" abstract="false" name="InitialMargin" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_OffsettingAssetsLiabilitiesTable" abstract="true" name="OffsettingAssetsLiabilitiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="pagp_OffsettingAssetsLiabilitiesLineItems" abstract="true" name="OffsettingAssetsLiabilitiesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_InterestRateSwapTerminatedInOctober2025Member" abstract="true" name="InterestRateSwapTerminatedInOctober2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_InterestRateSwapTerminatedInJune2026Member" abstract="true" name="InterestRateSwapTerminatedInJune2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_DerivativeNotionalAmountTerminated" abstract="false" name="DerivativeNotionalAmountTerminated" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_DeferredGainLossOnAccumulatedOtherComprehensiveIncomeLossNetOfTax" abstract="false" name="DeferredGainLossOnAccumulatedOtherComprehensiveIncomeLossNetOfTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_DerivativeAverageFixedExchangeRate" abstract="false" name="DerivativeAverageFixedExchangeRate" 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_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember" abstract="true" name="EquityMethodInvesteeThatOwnsLeasedStorageTanksMember" 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_LesseeLeasesRenewalTerm" abstract="false" name="LesseeLeasesRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_LeaseWeightedAverageRemainingLeaseTermAbstract" abstract="true" name="LeaseWeightedAverageRemainingLeaseTermAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LeasesWeightedAverageDiscountRatePercentAbstract" abstract="true" name="LeasesWeightedAverageDiscountRatePercentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="pagp_LeasesRightOfUseAsset" abstract="false" name="LeasesRightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LeasesLiability" abstract="false" name="LeasesLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_EffectiveIncomeTaxRateReconciliationProvincialTaxesAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationProvincialTaxesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_EffectiveIncomeTaxRateReconciliationProvincialTaxesPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationProvincialTaxesPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="pagp_EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationForeignWithholdingTaxesPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <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_DeferredTaxAssetsLeasingArrangements" abstract="false" name="DeferredTaxAssetsLeasingArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_IncomeTaxExaminationAmountofAssessmentDisputed" abstract="false" name="IncomeTaxExaminationAmountofAssessmentDisputed" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_IncomeTaxExaminationAmountofDisputedAssessmentPaid" abstract="false" name="IncomeTaxExaminationAmountofDisputedAssessmentPaid" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" 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_BPPlcAndSubsidiariesMember" abstract="true" name="BPPlcAndSubsidiariesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits" abstract="false" name="LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <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_PlainsAllAmerican2021LongTermIncentivePlanMember" abstract="true" name="PlainsAllAmerican2021LongTermIncentivePlanMember" 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_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" abstract="true" name="PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_PlainsAllAmericanLongTermIncentivePlansMember" abstract="true" name="PlainsAllAmericanLongTermIncentivePlansMember" 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsProbableVestingUnrecognizedFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsProbableVestingUnrecognizedFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidYearOne" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidYearOne" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidYearTwo" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidYearThree" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidYearFour" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidYearFive" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaidAfterYearFive" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaidAfterYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_OperatingAndFinanceLeasesLiabilityToBePaid" abstract="false" name="OperatingAndFinanceLeasesLiabilityToBePaid" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_Line9012015InsuranceProgramMember" abstract="true" name="Line9012015InsuranceProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_Line48IncidentMember" abstract="true" name="Line48IncidentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_LouisianaCoastalErosionLawsuitMember" abstract="true" name="LouisianaCoastalErosionLawsuitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_CurrentLiabilitiesMember" abstract="true" name="CurrentLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="pagp_InsuranceCoverageLimit" abstract="false" name="InsuranceCoverageLimit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_LossContingencySelfInsuredRetention" abstract="false" name="LossContingencySelfInsuredRetention" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LossContingencyCleanUpAndRemediateAggregateCost" abstract="false" name="LossContingencyCleanUpAndRemediateAggregateCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_LossContingencyCleanUpAndRemediationActivities" abstract="false" name="LossContingencyCleanUpAndRemediationActivities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_GeneralAndAdministrativeExpenseExcludingUnallocatedAmount" abstract="false" name="GeneralAndAdministrativeExpenseExcludingUnallocatedAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_SignificantSegmentExpenses" abstract="false" name="SignificantSegmentExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments" abstract="false" name="GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_DeficienciesUnderMinimumVolumeCommitmentsNet" abstract="false" name="DeficienciesUnderMinimumVolumeCommitmentsNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_EquityIndexedCompensationExpenseAwardsThatWillBeSettledInUnits" abstract="false" name="EquityIndexedCompensationExpenseAwardsThatWillBeSettledInUnits" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" abstract="false" name="SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_TransactionRelatedExpenses" abstract="false" name="TransactionRelatedExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_SegmentAmountsAttributableToNoncontrollingInterests" abstract="false" name="SegmentAmountsAttributableToNoncontrollingInterests" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_SegmentAdjustedEBITDA" abstract="false" name="SegmentAdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" 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_MaintenanceCapitalExpenditures" abstract="false" name="MaintenanceCapitalExpenditures" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="pagp_GrossMargin" abstract="false" name="GrossMargin" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
