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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2020-08-03T16:19:54.9460141+00:00 -->
<!-- Version            : 5.0.1.476 -->
<!-- Package ID         : 192f64ebb93d43acab98c62b3daad882 -->
<!-- Copyright (c) 2020 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="sgu_DerivativeMaximumPayoutUnderWeatherHedgeContract" name="DerivativeMaximumPayoutUnderWeatherHedgeContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_AdditionalPaymentObligatedToPayIfDegreeDaysExceedTenYearAverage" name="AdditionalPaymentObligatedToPayIfDegreeDaysExceedTenYearAverage" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_PaymentsAndReceivablesOfDerivativeHedgingContract" name="PaymentsAndReceivablesOfDerivativeHedgingContract" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_HomeHeatingOilAndPropaneMember" name="HomeHeatingOilAndPropaneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_OtherPetroleumProductsMember" name="OtherPetroleumProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_PetroleumProductsMember" name="PetroleumProductsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_EquipmentInstallationsMember" name="EquipmentInstallationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_EquipmentMaintenanceServiceContractsMember" name="EquipmentMaintenanceServiceContractsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_BillableCallServicesMember" name="BillableCallServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_RevenueRecognitionLineItems" name="RevenueRecognitionLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_RevenueRecognitionTable" name="RevenueRecognitionTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DeliveryAndBranchExpensesMember" name="DeliveryAndBranchExpensesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_ContractLiabilitiesRecognitionServiceContractPeriod" name="ContractLiabilitiesRecognitionServiceContractPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_CommonStockRepurchaseProgramMember" name="CommonStockRepurchaseProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CommonStockRepurchaseProgramUnderPrivatelyNegotiatedMember" name="CommonStockRepurchaseProgramUnderPrivatelyNegotiatedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CommonStockRepurchaseProgramUnderOpenMarketMember" name="CommonStockRepurchaseProgramUnderOpenMarketMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CommonStockRepurchaseProgramUnderOpenMarketTransactionsMember" name="CommonStockRepurchaseProgramUnderOpenMarketTransactionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_AvailabilityRequiredToPayDistributionsOrRepurchaseCommonUnits" name="AvailabilityRequiredToPayDistributionsOrRepurchaseCommonUnits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_MinimumPercentageOfBorrowingCapacityToPayAnyDistributionsToUnitholdersOrRepurchaseCommonUnits" name="MinimumPercentageOfBorrowingCapacityToPayAnyDistributionsToUnitholdersOrRepurchaseCommonUnits" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits" name="MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_AveragePricePaidPerUnit" name="AveragePricePaidPerUnit" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_PubliclyAnnouncedPlansOrProgramsAsPartOfCommonStockRepurchaseProgramMember" name="PubliclyAnnouncedPlansOrProgramsAsPartOfCommonStockRepurchaseProgramMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_PrivateTransactionMember" name="PrivateTransactionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CashAndReceivablesMember" name="CashAndReceivablesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_ForeignBondsAndNotesMember" name="ForeignBondsAndNotesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_SwapContractOneMember" name="SwapContractOneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_InternalFuelUsageCallAndSwapContractMember" name="InternalFuelUsageCallAndSwapContractMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DerivativeFairValueOfDerivativeLiabilityMember" name="DerivativeFairValueOfDerivativeLiabilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DeferredChargesAndOtherAssetsNetAndOtherLongTermLiabilitiesNetMember" name="DeferredChargesAndOtherAssetsNetAndOtherLongTermLiabilitiesNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet" name="DerivativeFairValueGrossAmountNotOffsetFinancialInstrumentsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities" name="CashCollateralReceivedFromNotOffsetAgainstDerivativeAssetsAndLiabilities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_FairValuesOfFinancialAssetsAndLiabilitiesIncludingDerivativeFinancialInstrumentsLineItems" name="FairValuesOfFinancialAssetsAndLiabilitiesIncludingDerivativeFinancialInstrumentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_FairValuesOfFinancialAssetsAndLiabilitiesIncludingDerivativeFinancialInstrumentsTable" name="FairValuesOfFinancialAssetsAndLiabilitiesIncludingDerivativeFinancialInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_SubjectToMasterNettingArrangementMember" name="SubjectToMasterNettingArrangementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DeferredChargesAndOtherAssetsNetMember" name="DeferredChargesAndOtherAssetsNetMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_LongTermDerivativeAssetsMember" name="LongTermDerivativeAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CostOfServicesMember" name="CostOfServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_AcquiredBusinessMember" name="AcquiredBusinessMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_TradeNamesAndOtherIntangiblesMember" name="TradeNamesAndOtherIntangiblesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_LinesOfCreditCurrentCarryingValue" name="LinesOfCreditCurrentCarryingValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_LinesOfCreditCurrentFairValue" name="LinesOfCreditCurrentFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_LongtermDebtFairValueCurrent" name="LongtermDebtFairValueCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_LongTermDebtNoncurrentFairValue" name="LongTermDebtNoncurrentFairValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_LineOfCreditFacilityAdditionalBorrowingCapacityForWorkingCapitalNeeds" name="LineOfCreditFacilityAdditionalBorrowingCapacityForWorkingCapitalNeeds" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_QuarterlyMember" name="QuarterlyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_AnnuallyMember" name="AnnuallyMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_MaximumIncreaseAllowedWithoutBankConsulting" name="MaximumIncreaseAllowedWithoutBankConsulting" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_AdditionalAnnualPaymentToTermLoanFacilityPercentageOfExcessCashFlow" name="AdditionalAnnualPaymentToTermLoanFacilityPercentageOfExcessCashFlow" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodTwo" name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodTwo" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodOne" name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodOne" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumFixedChargeCoverageRatioOnRevolvingCreditFacilities" name="MinimumFixedChargeCoverageRatioOnRevolvingCreditFacilities" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_AvailabilityPercentageToMaximumFacilitySize" name="AvailabilityPercentageToMaximumFacilitySize" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_DebtInstrumentLeverageRatioPeriodOne" name="DebtInstrumentLeverageRatioPeriodOne" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="sgu_DebtInstrumentLeverageRatioPeriodTwo" name="DebtInstrumentLeverageRatioPeriodTwo" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="sgu_AvailabilityUnderCreditAgreement" name="AvailabilityUnderCreditAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_DeferredTaxExpenseBenefit" name="DeferredTaxExpenseBenefit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_IncomeTaxesTextualAbstract" name="IncomeTaxesTextualAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_IncomeTaxDisclosureLineItems" name="IncomeTaxDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_IncomeTaxDisclosureTable" name="IncomeTaxDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_FederalMember" name="FederalMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_IncomeTaxExaminationYearsOpenForExamination" name="IncomeTaxExaminationYearsOpenForExamination" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_OperatingLeaseExpirationYear" name="OperatingLeaseExpirationYear" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_LesseeOperatingLeaseOptionToExtendTerm" name="LesseeOperatingLeaseOptionToExtendTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CashPaidDuringPeriodForAbstract" name="CashPaidDuringPeriodForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CashFlowSupplementalDisclosuresLineItems" name="CashFlowSupplementalDisclosuresLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CashFlowSupplementalDisclosuresTable" name="CashFlowSupplementalDisclosuresTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DilutiveImpactOfTheoreticalDistribution" name="DilutiveImpactOfTheoreticalDistribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_LimitedPartnersInterestInNetIncomeLossDilutive" name="LimitedPartnersInterestInNetIncomeLossDilutive" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted" name="IncomeLossFromOperationsPerOutstandingLimitedPartnershipUnitBasicAndDiluted" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings" name="DilutiveImpactOfTheoreticalDistributionOfEarnings" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_CustomerListAndAssetsOfHeatingOilDealerMember" name="CustomerListAndAssetsOfHeatingOilDealerMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_PartnersCapitalProjectedDistributionAmountOnAnnualizedBasisPerShare" name="PartnersCapitalProjectedDistributionAmountOnAnnualizedBasisPerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumDividendDistributionPerUnit" name="MinimumDividendDistributionPerUnit" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_IncentiveDistributionToGeneralPartner" name="IncentiveDistributionToGeneralPartner" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_IncentiveDistributionsToManagement" name="IncentiveDistributionsToManagement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
</xsd:schema>
