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  <xs:element id="spxc_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetGainLossIncludedInEarnings" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetGainLossIncludedInEarnings" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SealiteMember" abstract="true" name="SealiteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SPXHeatTransferBusinessMember" abstract="true" name="SPXHeatTransferBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_BuildingsAndLeaseholdImprovementsMember" abstract="true" name="BuildingsAndLeaseholdImprovementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerAssetNetCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerAssetNetCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReserves" abstract="false" name="RestructuringAndIntegrationReserves" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_MutaresAGMember" abstract="true" name="MutaresAGMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" abstract="false" name="ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="spxc_PackageAndProcessCoolingEquipmentAndServicesMember" abstract="true" name="PackageAndProcessCoolingEquipmentAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetValue" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisAssetValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityGainLossIncludingInEarnings" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityGainLossIncludingInEarnings" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtRollForward" abstract="true" name="DebtRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_LargePowerProjectsMember" abstract="true" name="LargePowerProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfActiveSites" abstract="false" name="SiteContingencyNumberOfActiveSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable" abstract="true" name="FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_RepaymentsUnderSeniorCreditFacilities" abstract="false" name="RepaymentsUnderSeniorCreditFacilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ContractwithCustomersNet" abstract="false" name="ContractwithCustomersNet" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_CurrentSPXTermLoanFacilitiesMember" abstract="true" name="CurrentSPXTermLoanFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" abstract="true" name="FiniteLivedAndIndefiniteLivedIntangibleAssetsByMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SignalMonitoringObstructionLightingAndBusFareCollectionSystemsMember" abstract="true" name="SignalMonitoringObstructionLightingAndBusFareCollectionSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesTranslationAndOtherAdjustment" abstract="false" name="RestructuringAndIntegrationReservesTranslationAndOtherAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ULCRoboticsMember" abstract="true" name="ULCRoboticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityGainLossIncludingInOtherComprehensiveIncomeLoss" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityGainLossIncludingInOtherComprehensiveIncomeLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_BankandSuretyBondsMember" abstract="true" name="BankandSuretyBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SouthAfricanProjectsMember" abstract="true" name="SouthAfricanProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityNoncurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_MHIAdditionalClaimsMember" abstract="true" name="MHIAdditionalClaimsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SealiteAcquisitionMember" abstract="true" name="SealiteAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSites" abstract="false" name="SiteContingencyNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReservesPeriodExpense" abstract="false" name="RestructuringAndIntegrationReservesPeriodExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_RestrictedStockAndRestrictedStockUnitsMember" abstract="true" name="RestrictedStockAndRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_BoilerComfortHeatingAndVentilationMember" abstract="true" name="BoilerComfortHeatingAndVentilationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_BorrowingUnderTradeReceivablesAgreement" abstract="false" name="BorrowingUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinContractwithCustomerLiabilityCurrent" abstract="false" name="IncreaseDecreaseinContractwithCustomerLiabilityCurrent" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationCostsAndExpensesAbstract" abstract="true" name="DisposalGroupIncludingDiscontinuedOperationCostsAndExpensesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SPXTransformerSolutionsIncMember" abstract="true" name="SPXTransformerSolutionsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_CuesInc.Member" abstract="true" name="CuesInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
