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  <xs:element id="smc_DebtInstrumentTenderedAndValidlyAcceptedAndFullyDischargedAmount" abstract="false" name="DebtInstrumentTenderedAndValidlyAcceptedAndFullyDischargedAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DebtInstrumentCovenantExcessCashFlowOfferToPurchaseAssetSaleOfferExpired" abstract="false" name="DebtInstrumentCovenantExcessCashFlowOfferToPurchaseAssetSaleOfferExpired" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DebtInstrumentNoticeOfRedemptionOnTenderOfferRedemptionAmount" abstract="false" name="DebtInstrumentNoticeOfRedemptionOnTenderOfferRedemptionAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DebtInstrumentRedemptionIrrevocableDeposit" abstract="false" name="DebtInstrumentRedemptionIrrevocableDeposit" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DebtInstrumentRedemptionNoticeAmount" abstract="false" name="DebtInstrumentRedemptionNoticeAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DebtInstrumentsRedemptionPeriodOneMember" abstract="true" name="DebtInstrumentsRedemptionPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_DebtInstrumentsRedemptionPeriodTwoMember" abstract="true" name="DebtInstrumentsRedemptionPeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_DebtInstrumentRedemptionPeriodAfterTwoMember" abstract="true" name="DebtInstrumentRedemptionPeriodAfterTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_SeniorNotesDue2025Member" abstract="true" name="SeniorNotesDue2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_SeniorNotesDue2026Member" abstract="true" name="SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_SeniorUnsecuredNotesDueTwentyTwentySixMember" abstract="true" name="SeniorUnsecuredNotesDueTwentyTwentySixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_SeniorSecuredNotesDueTwentyTwentyNineMember" abstract="true" name="SeniorSecuredNotesDueTwentyTwentyNineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_SterlingDJMember" abstract="true" name="SterlingDJMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_LimitedPartnerCommonUnitsMember" abstract="true" name="LimitedPartnerCommonUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_TemporaryEquityCorporateReorganization" abstract="false" name="TemporaryEquityCorporateReorganization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="smc_PartnersCapitalTable" abstract="true" name="PartnersCapitalTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="smc_BlankCheckCommonStockMember" abstract="true" name="BlankCheckCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_PartnersCapitalLineItems" abstract="true" name="PartnersCapitalLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="smc_AccruedAndUnpaidDistributions" abstract="false" name="AccruedAndUnpaidDistributions" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_PartnersCapitalIssuanceCosts" abstract="false" name="PartnersCapitalIssuanceCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_DistributionOfAllAvailableCashMaximumPeriodFollowingEndOfQuarter" abstract="false" name="DistributionOfAllAvailableCashMaximumPeriodFollowingEndOfQuarter" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="smc_SeriesAPreferredUnitsMember" abstract="true" name="SeriesAPreferredUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_PhantomShareUnitsAndAssociatedDistributionEquivalentRightsMember" abstract="true" name="PhantomShareUnitsAndAssociatedDistributionEquivalentRightsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_CommonUnitsMember" abstract="true" name="CommonUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_UnvestedRestrictedStockUnitsAndPerformanceBasedAwardsMember" abstract="true" name="UnvestedRestrictedStockUnitsAndPerformanceBasedAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_LongTermIncentivePlanMember" abstract="true" name="LongTermIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardGrantDateFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_BusinessCombinationConsiderationNumberOfDirectorsAfterCombination" abstract="false" name="BusinessCombinationConsiderationNumberOfDirectorsAfterCombination" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="smc_MeadowlarkMidstreamGatheringSystemMember" abstract="true" name="MeadowlarkMidstreamGatheringSystemMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_A2015BlacktailReleaseMember" abstract="true" name="A2015BlacktailReleaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_NaturalResourceDamagesToFederalAndStateGovernmentsMember" abstract="true" name="NaturalResourceDamagesToFederalAndStateGovernmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_DamagesPayableToFederalGovernmentOverFiveYearsMember" abstract="true" name="DamagesPayableToFederalGovernmentOverFiveYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_DamagesPayableToStateGovernmentsOverSixYearsMember" abstract="true" name="DamagesPayableToStateGovernmentsOverSixYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="smc_DamagesPayableToFederalCriminalOverFiveYearsMember" abstract="true" name="DamagesPayableToFederalCriminalOverFiveYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_EnvironmentalLossContingenciesPenaltiesAndFinesPaymentPeriod" abstract="false" name="EnvironmentalLossContingenciesPenaltiesAndFinesPaymentPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="smc_AccrualForEnvironmentalLossContingenciesExpectedPayment" abstract="false" name="AccrualForEnvironmentalLossContingenciesExpectedPayment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" abstract="false" name="AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_ReconciliationOfNetIncomeToEBITDAAdditionsAbstract" abstract="true" name="ReconciliationOfNetIncomeToEBITDAAdditionsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="smc_CorporateAndOtherExpenses" abstract="false" name="CorporateAndOtherExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationProportionalEquityMethodInvestmentAdjustment" abstract="false" name="AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortizationProportionalEquityMethodInvestmentAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_AdjustmentsRelatedToCapitalReimbursementActivity" abstract="false" name="AdjustmentsRelatedToCapitalReimbursementActivity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_TransactionCostsAndOtherExpenses" abstract="false" name="TransactionCostsAndOtherExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="smc_TallOakMember" abstract="true" name="TallOakMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_TailwaterCapitalLLCMember" abstract="true" name="TailwaterCapitalLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_BusinessContributionAgreementMember" abstract="true" name="BusinessContributionAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_TallOakParentMember" abstract="true" name="TallOakParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_BusinessCombinationConsiderationNumberOfDirectorsPriorToCombination" abstract="false" name="BusinessCombinationConsiderationNumberOfDirectorsPriorToCombination" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="smc_BusinessCombinationConsiderationIncreaseInNumberOfDirectors" abstract="false" name="BusinessCombinationConsiderationIncreaseInNumberOfDirectors" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="smc_J.HeathDenekeMember" abstract="true" name="J.HeathDenekeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="smc_JamesD.JohnstonMember" abstract="true" name="JamesD.JohnstonMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
