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  <xs:element id="spxc_PeriodOfRollingTermOfEmploymentAgreements" abstract="false" name="PeriodOfRollingTermOfEmploymentAgreements" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange4Member" abstract="true" name="SeniorCreditAgreementRange4Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LesseeLeaseTerminationPeriod" abstract="false" name="LesseeLeaseTerminationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_SubsidiaryofmutaresAGtheBuyerMember" abstract="true" name="SubsidiaryofmutaresAGtheBuyerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange2Member" abstract="true" name="SeniorCreditAgreementRange2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageofCapitalStockofDomesticSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearFive" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearFive" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ScheduleOfFundedStatusAndAmountsRecognizedInBalanceSheetAndAccumulatedOtherComprehensiveIncomeLossTableTextBlock" abstract="false" name="ScheduleOfFundedStatusAndAmountsRecognizedInBalanceSheetAndAccumulatedOtherComprehensiveIncomeLossTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_IncomeFromContinuingOperationsBeforeIncomeTaxesMember" abstract="true" name="IncomeFromContinuingOperationsBeforeIncomeTaxesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_NumberOfCountriesInWhichEntitySellsItsProductsAndServices" abstract="false" name="NumberOfCountriesInWhichEntitySellsItsProductsAndServices" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_GainLossonDispositionofDiscontinuedOperationsNetofTaxMember" abstract="true" name="GainLossonDispositionofDiscontinuedOperationsNetofTaxMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1: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_TriggeringEventAxis" abstract="true" name="TriggeringEventAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsAggregateAmountofCapitalStockRepurchasesandDividendDeclarations" abstract="false" name="DebtInstrumentCovenantTermsAggregateAmountofCapitalStockRepurchasesandDividendDeclarations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_EquityAndStockBasedCompensationDisclosureAbstract" abstract="true" name="EquityAndStockBasedCompensationDisclosureAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BuildingsAndLeaseholdImprovementsMember" abstract="true" name="BuildingsAndLeaseholdImprovementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" abstract="true" name="AcquisitionsDispositionsAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_ComponentsOfCashAndCashEquivalentsAbstract" abstract="true" name="ComponentsOfCashAndCashEquivalentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearThree" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ScheduleOfExpectedBenefitPaymentsAndFederalSubsidiesTableTextBlock" abstract="false" name="ScheduleOfExpectedBenefitPaymentsAndFederalSubsidiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_OtherLongTermLiabilitiesMember" abstract="true" name="OtherLongTermLiabilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ImpairmentOfLongLivedAssetsAndFiniteLivedIntangibleAssetsPolicyTextBlock" abstract="false" name="ImpairmentOfLongLivedAssetsAndFiniteLivedIntangibleAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityPeriodBasedOnHistoricalVolatility" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_RevenuePaymentTermForReplacementAndSpareParts" abstract="false" name="RevenuePaymentTermForReplacementAndSpareParts" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_CustomerBacklogMember" abstract="true" name="CustomerBacklogMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedInterestCoverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedInterestCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_LegacySPXMember" abstract="true" name="LegacySPXMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OtherForeignCountriesMember" abstract="true" name="OtherForeignCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LiabilityForAsbestosAndEnvironmentalClaimsProceedsFromInsuranceRecoveries" abstract="false" name="LiabilityForAsbestosAndEnvironmentalClaimsProceedsFromInsuranceRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_TAMorrisonCoIncTAMCOMember" abstract="true" name="TAMorrisonCoIncTAMCOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentPeriodicPaymentPercentageOfPrincipal" abstract="false" name="DebtInstrumentPeriodicPaymentPercentageOfPrincipal" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateCalculationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_PaymentForDivestitures" abstract="false" name="PaymentForDivestitures" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageofCapitalStockofMaterialFirstTierForeignSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageofCapitalStockofMaterialFirstTierForeignSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAmortizationPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAmortizationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsAdditionalAmountofCapitalStockRepurchasesandDividendDeclarations" abstract="false" name="DebtInstrumentCovenantTermsAdditionalAmountofCapitalStockRepurchasesandDividendDeclarations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SPXPostretirementPlansMember" abstract="true" name="SPXPostretirementPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncomeTaxExpenseBenefitForUncertainTaxPositionsAndInterestWithVariousRefundClaimsPeriod" abstract="false" name="IncomeTaxExpenseBenefitForUncertainTaxPositionsAndInterestWithVariousRefundClaimsPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsMaximumPeriodtoReinvestProceeds" abstract="false" name="DebtInstrumentCovenantTermsMaximumPeriodtoReinvestProceeds" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" abstract="false" name="ScheduleOfRestructuringImpairmentAndOtherActivitiesBySegmentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitRevaluationOfDeferredTaxLiabilities" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxExpenseBenefitRevaluationOfDeferredTaxLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfSubsidiariesDivested" abstract="false" name="NumberOfSubsidiariesDivested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentGross" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentNumberOfDrawings" abstract="false" name="DebtInstrumentNumberOfDrawings" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_A2019StockCompensationPlanMember" abstract="true" name="A2019StockCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_HVACReportableSegmentMember" abstract="true" name="HVACReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OtherBorrowingsMember" abstract="true" name="OtherBorrowingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationSettlementCharges" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationSettlementCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CommunicationTechnologiesandBusFareCollectionSystemsMember" abstract="true" name="CommunicationTechnologiesandBusFareCollectionSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_OperatingExpense" abstract="false" name="OperatingExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CompanyOwnedLifeInsurancePoliciesPolicyTextBlock" abstract="false" name="CompanyOwnedLifeInsurancePoliciesPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="spxc_DetectionandMeasurementReportableSegmentMember" abstract="true" name="DetectionandMeasurementReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LongLivedAssetsOfDiscontinuedOperations" abstract="false" name="LongLivedAssetsOfDiscontinuedOperations" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentBasisSpreadonVariableRateDurationofInterestPeriod" abstract="false" name="DebtInstrumentBasisSpreadonVariableRateDurationofInterestPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsTotalShareholderReturnCorrelation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" abstract="false" name="DeferredTaxAssetsNetOperatingLossAndTaxCreditCarryforwards" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" abstract="false" name="SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_PerformanceSharesUnitsAndRestrictedShareUnitsMember" abstract="true" name="PerformanceSharesUnitsAndRestrictedShareUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LiabilitiesOfAbandonedEntities" abstract="false" name="LiabilitiesOfAbandonedEntities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_OtherCashCostsRecoveriesNet" abstract="false" name="OtherCashCostsRecoveriesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ChinaAndSouthAfricaMember" abstract="true" name="ChinaAndSouthAfricaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInNextRollingTwelveMonths" abstract="false" name="LeaseLiabilityPaymentsDueInNextRollingTwelveMonths" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncreaseDecreaseinAccountsReceivableNet" abstract="false" name="IncreaseDecreaseinAccountsReceivableNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_EBITDAConsolidatedCoverageRatio" abstract="false" name="EBITDAConsolidatedCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_GainLossOnAmendmentAndOrRefinancingOfDebt" abstract="false" name="GainLossOnAmendmentAndOrRefinancingOfDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SensorsSoftwareIncMember" abstract="true" name="SensorsSoftwareIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_SpecialCharges" abstract="false" name="SpecialCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DebtInstrumentFrontingFee" abstract="false" name="DebtInstrumentFrontingFee" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_SPXHeatTransferBusinessMember" abstract="true" name="SPXHeatTransferBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationImpairmentAndBasisAdjustmentsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationImpairmentAndBasisAdjustmentsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="GrossGoodwillRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncrementalTermLoansMember" abstract="true" name="IncrementalTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelTable" abstract="true" name="BlackScholesOptionPricingModelTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodFourMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_RepaymentsUnderTradeReceivablesAgreement" abstract="false" name="RepaymentsUnderTradeReceivablesAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CincinnatiFanAndTAMCOMember" abstract="true" name="CincinnatiFanAndTAMCOMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ResolutionOfDisputeWithFormerAgentMember" abstract="true" name="ResolutionOfDisputeWithFormerAgentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_BlackScholesOptionPricingModelLineItems" abstract="true" name="BlackScholesOptionPricingModelLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_CurrentRevolvingSPXFacilitiesMember" abstract="true" name="CurrentRevolvingSPXFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanContributionsByEmployerAndPlanParticipants" abstract="false" name="DefinedBenefitPlanContributionsByEmployerAndPlanParticipants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SiteContingencyNumberOfSites" abstract="false" name="SiteContingencyNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_FinanceLeaseCost" abstract="false" name="FinanceLeaseCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ALLOtherDiscontinuedOperationsMember" abstract="true" name="ALLOtherDiscontinuedOperationsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAccumulatedDepreciation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfDisputes" abstract="false" name="NumberOfDisputes" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_FinanceLeaseCostsAbstract" abstract="true" name="FinanceLeaseCostsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingAfterYearFive" abstract="false" name="LeaseLiabilityPaymentsDueInRollingAfterYearFive" nillable="true" xbrli:periodType="instant" 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_LastDayOfAnyFiscalQuarterMember" abstract="true" name="LastDayOfAnyFiscalQuarterMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearTwo" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SpecialChargesNonCash" abstract="false" name="SpecialChargesNonCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" 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_BankandSuretyBondsMember" abstract="true" name="BankandSuretyBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_IncomeTaxExpenseBenefitAssociatedWithGlobalIntangibleLowTaxedIncome" abstract="false" name="IncomeTaxExpenseBenefitAssociatedWithGlobalIntangibleLowTaxedIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IndexTypeAxis" abstract="true" name="IndexTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" abstract="false" name="ScheduleofRestructuringandIntegratedLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_TechnologyMember" abstract="true" name="TechnologyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ScheduleOfDebtInstrumentsTable" abstract="true" name="ScheduleOfDebtInstrumentsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="spxc_SeniorCreditFacilitiesMember" abstract="true" name="SeniorCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOther" abstract="false" name="AccumulatedImpairmentsRelatedToForeignCurrencyTranslationAndOther" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IncrementalLoanMember" abstract="true" name="IncrementalLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_TransformerSolutionsMember" abstract="true" name="TransformerSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PeriodWithinWhichAssetWillBeSold" abstract="false" name="PeriodWithinWhichAssetWillBeSold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_GoodwillAccumulatedImpairmentDuringPeriod" abstract="false" name="GoodwillAccumulatedImpairmentDuringPeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityValue" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_TriggeringEventDomain" abstract="true" name="TriggeringEventDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_PeriodWithinWhichLiabilitiesWillBeSettled" abstract="false" name="PeriodWithinWhichLiabilitiesWillBeSettled" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentAdditionalPeriodtoReinvestProceedsifCommittedtobeReinvested" abstract="false" name="DebtInstrumentAdditionalPeriodtoReinvestProceedsifCommittedtobeReinvested" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_EffectiveIncomeTaxRateReconciliationNonDeductibleLossOnDispositionOfBusinessPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNonDeductibleLossOnDispositionOfBusinessPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_AccountsReceivableAllowanceForCreditLossAcquisitions" abstract="false" name="AccountsReceivableAllowanceForCreditLossAcquisitions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDueInRollingYearFour" abstract="false" name="LeaseLiabilityPaymentsDueInRollingYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_CanadianPensionPlansMember" abstract="true" name="CanadianPensionPlansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_CurrentSPXTermLoanFacilitiesMember" abstract="true" name="CurrentSPXTermLoanFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1: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_NonFinancialLettersOfCreditMember" abstract="true" name="NonFinancialLettersOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentCollateralPercentageOfNonVotingCapitalStockOfMaterialFirstTierForeignSubsidiaries" abstract="false" name="DebtInstrumentCollateralPercentageOfNonVotingCapitalStockOfMaterialFirstTierForeignSubsidiaries" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_RestructuringAndIntegrationReserveSettledWithCash" abstract="false" name="RestructuringAndIntegrationReserveSettledWithCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_GoodwillIndefiniteLivedIntangibleAndOtherLongLivedAssetsPolicyTextBlock" abstract="false" name="GoodwillIndefiniteLivedIntangibleAndOtherLongLivedAssetsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodThreeMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SealiteAcquisitionMember" abstract="true" name="SealiteAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ITLAcquisitionMember" abstract="true" name="ITLAcquisitionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedContributionPlanFairValueofPlanAssets" abstract="false" name="DefinedContributionPlanFairValueofPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NonUSExposureMember" abstract="true" name="NonUSExposureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_RevenuePerformanceObligationContractTerm" abstract="false" name="RevenuePerformanceObligationContractTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_OperatingLeasesAbstract" abstract="true" name="OperatingLeasesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BalckeDurrBusinessMember" abstract="true" name="BalckeDurrBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SecuredOvernightFinancingRateSOFRPeriodOneMember" abstract="true" name="SecuredOvernightFinancingRateSOFRPeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsPercentageofConsolidatedNetDeficit" abstract="false" name="DebtInstrumentCovenantTermsPercentageofConsolidatedNetDeficit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationLossOnSettlement" abstract="false" name="DefinedBenefitPlanBenefitObligationLossOnSettlement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_GuaranteesandBondsMember" abstract="true" name="GuaranteesandBondsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_EnvironmentalCompliancePolicyTextBlock" abstract="false" name="EnvironmentalCompliancePolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedCoverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedCoverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalEnvironmentalAndSelfInsurance" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalEnvironmentalAndSelfInsurance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_TransformerSolutionsBusinessMember" abstract="true" name="TransformerSolutionsBusinessMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LeaseLiabilityPaymentsDue" abstract="false" name="LeaseLiabilityPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AccountsReceivableAndOtherAssetsWriteOff" abstract="false" name="AccountsReceivableAndOtherAssetsWriteOff" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_FinancialLettersOfCreditMember" abstract="true" name="FinancialLettersOfCreditMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements" abstract="false" name="SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsConsolidatedLeverageRatio" abstract="false" name="DebtInstrumentCovenantTermsConsolidatedLeverageRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="spxc_UnrecognizedTaxBenefitsNet" abstract="false" name="UnrecognizedTaxBenefitsNet" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_AsbestosPortfolioSaleMember" abstract="true" name="AsbestosPortfolioSaleMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_InterestRateSwapThroughNovember2024Member" abstract="true" name="InterestRateSwapThroughNovember2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SharesOutstandingRollForward" abstract="true" name="SharesOutstandingRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_LeaseLiability" abstract="false" name="LeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LargePowerProjectsMember" abstract="true" name="LargePowerProjectsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_LeaseRemainingLeaseTerm" abstract="false" name="LeaseRemainingLeaseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="spxc_DebtInstrumentCovenantTermsPercentageofCumulativeConsolidatedNetIncome" abstract="false" name="DebtInstrumentCovenantTermsPercentageofCumulativeConsolidatedNetIncome" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="spxc_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationInFutureYears" abstract="false" name="DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationInFutureYears" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SP600CapitalGoodsIndexMember" abstract="true" name="SP600CapitalGoodsIndexMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationCashPayment" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationCashPayment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_PaymentForDivestiture" abstract="false" name="PaymentForDivestiture" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_IngeniaTechnologiesInc.Member" abstract="true" name="IngeniaTechnologiesInc.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="spxc_ULCRoboticsMember" abstract="true" name="ULCRoboticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_ExecutiveAgreementsAbstract" abstract="true" name="ExecutiveAgreementsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_FourFiscalQuartersAfterCertainPermittedAcquisitionsFinancedByUnsecuredDebtMember" abstract="true" name="FourFiscalQuartersAfterCertainPermittedAcquisitionsFinancedByUnsecuredDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SupplementalCashflowNonCashActivitiesAbstract" abstract="true" name="SupplementalCashflowNonCashActivitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_BusinessCombinationReductionInEstimatedLiability" abstract="false" name="BusinessCombinationReductionInEstimatedLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_SPXTransformerSolutionsIncMember" abstract="true" name="SPXTransformerSolutionsIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" abstract="false" name="APICShareBasedPaymentArrangementLongTermIncentiveCompensationExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DefinedBenefitPlanBenefitObligationConsiderationPaidToCarrier" abstract="false" name="DefinedBenefitPlanBenefitObligationConsiderationPaidToCarrier" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_NumberOfLargePowerProjects" abstract="false" name="NumberOfLargePowerProjects" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="spxc_ProcessCoolingEquipmentAndServicesMember" abstract="true" name="ProcessCoolingEquipmentAndServicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DefinedContributionPlanNumberOfSharesContributed" abstract="false" name="DefinedContributionPlanNumberOfSharesContributed" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="spxc_OperatingAndFinancialLeasesTotalAbstract" abstract="true" name="OperatingAndFinancialLeasesTotalAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="spxc_PerformanceSharesRestrictedStockRestrictedStockUnitsandEmployeeStockOptionMember" abstract="true" name="PerformanceSharesRestrictedStockRestrictedStockUnitsandEmployeeStockOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_SeniorCreditAgreementRange3Member" abstract="true" name="SeniorCreditAgreementRange3Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DBTTechnologiesMember" abstract="true" name="DBTTechnologiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_InterestRateSwapThroughMarch2021Member" abstract="true" name="InterestRateSwapThroughMarch2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_UnvestedRestrictedStockAndRestrictedStockUnitsthatdidnotMeetRequiredMarketThresholdsforVestingMember" abstract="true" name="UnvestedRestrictedStockAndRestrictedStockUnitsthatdidnotMeetRequiredMarketThresholdsforVestingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DBTTechnologiesIncludingCTAWriteOffMember" abstract="true" name="DBTTechnologiesIncludingCTAWriteOffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationTransferOfAllEquityPurchasePrice" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationTransferOfAllEquityPurchasePrice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_LossOnDivestitureOfAsbestosRelatedAssetsAndLiabilities" abstract="false" name="LossOnDivestitureOfAsbestosRelatedAssetsAndLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_TheSubsidiariesMember" abstract="true" name="TheSubsidiariesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationTransactionCosts" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="spxc_ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardRestrictedStockActivityValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
</xs:schema>
