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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2022-05-04T15:26:47.9088749+00:00 -->
<!-- Version            : 5.0.1.747 -->
<!-- Package ID         : f39695c71f504cffb35e2e09eaa6e288 -->
<!-- Copyright (c) 2022 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="sgu_CommonStockRepurchaseProgramUnderOpenMarketMember" name="CommonStockRepurchaseProgramUnderOpenMarketMember" type="dtr-types: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="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits" name="MinimumFixedChargeCoverageRatioForDistributionsToUnitholdersOrRepurchaseCommonUnits" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_AveragePricePaidPerUnit" name="AveragePricePaidPerUnit" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_PubliclyAnnouncedPlansOrProgramsAsPartOfCommonStockRepurchaseProgramMember" name="PubliclyAnnouncedPlansOrProgramsAsPartOfCommonStockRepurchaseProgramMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_PrivateTransactionMember" name="PrivateTransactionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CashAndReceivablesMember" name="CashAndReceivablesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_ForeignBondsAndNotesMember" name="ForeignBondsAndNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_SwapContractOneMember" name="SwapContractOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_InternalFuelUsageCallAndSwapContractMember" name="InternalFuelUsageCallAndSwapContractMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DerivativeFairValueOfDerivativeLiabilityMember" name="DerivativeFairValueOfDerivativeLiabilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DeferredChargesAndOtherAssetsNetAndOtherLongTermLiabilitiesNetMember" name="DeferredChargesAndOtherAssetsNetAndOtherLongTermLiabilitiesNetMember" type="dtr-types: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="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_DerivativeFairValueOfDerivativeAssetMember" name="DerivativeFairValueOfDerivativeAssetMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_LongTermDerivativeAssetsMember" name="LongTermDerivativeAssetsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_CostOfServicesMember" name="CostOfServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsIncludingGoodwill" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsIncludingGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="sgu_HeatingOilDealersMember" name="HeatingOilDealersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_PropaneAndOilDealersMember" name="PropaneAndOilDealersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_TradeNamesAndOtherIntangiblesMember" name="TradeNamesAndOtherIntangiblesMember" type="dtr-types: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_CreditAgreementMember" name="CreditAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_QuarterlyMember" name="QuarterlyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="sgu_AnnuallyMember" name="AnnuallyMember" type="dtr-types: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_AdditionalIncreaseAllowedWithoutBankConsulting" name="AdditionalIncreaseAllowedWithoutBankConsulting" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="sgu_AdditionalAnnualPaymentToTermLoanFacilityPercentageOfExcessCashFlow" name="AdditionalAnnualPaymentToTermLoanFacilityPercentageOfExcessCashFlow" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodTwo" name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodTwo" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodOne" name="LineOfCreditFacilityUnusedCapacityCommitmentFeePercentagePeriodOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumFixedChargeCoverageRatioOnRevolvingCreditFacilities" name="MinimumFixedChargeCoverageRatioOnRevolvingCreditFacilities" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_AvailabilityPercentageToMaximumFacilitySize" name="AvailabilityPercentageToMaximumFacilitySize" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_DebtInstrumentLeverageRatioPeriodOne" name="DebtInstrumentLeverageRatioPeriodOne" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="sgu_DebtInstrumentLeverageRatioPeriodTwo" name="DebtInstrumentLeverageRatioPeriodTwo" type="dtr-types: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_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="dtr-types: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_CashPaidDuringPeriodForAbstract" name="CashPaidDuringPeriodForAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" 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="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_DilutiveImpactOfTheoreticalDistributionOfEarnings" name="DilutiveImpactOfTheoreticalDistributionOfEarnings" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="sgu_PartnersCapitalProjectedDistributionAmountOnAnnualizedBasisPerShare" name="PartnersCapitalProjectedDistributionAmountOnAnnualizedBasisPerShare" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <xsd:element id="sgu_MinimumDividendDistributionPerUnit" name="MinimumDividendDistributionPerUnit" type="dtr-types: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>
