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<?xml version="1.0" encoding="windows-1252"?> |
<!-- XBRL Document Created with the Workiva Platform --> |
<!-- Copyright 2024 Workiva --> |
<!-- r:7a822a55-5a37-448b-9dee-19d926240bc5,g:be1ac35d-4f16-4387-b567-64a6c8101340 --> |
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:spxc="http://www.spx.com/20240320" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2022-03-31" xmlns:dtr-types1="http://www.xbrl.org/dtr/type/2020-01-21" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.spx.com/20240320"> |
| <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/> |
| <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/> |
| <xs:import namespace="http://www.xbrl.org/dtr/type/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.xsd"/> |
| <xs:import namespace="http://www.xbrl.org/dtr/type/2022-03-31" schemaLocation="https://www.xbrl.org/dtr/type/2022-03-31/types.xsd"/> |
| <xs:import namespace="http://xbrl.sec.gov/dei-sub/2023" schemaLocation="https://xbrl.sec.gov/dei/2023/dei-sub-2023.xsd"/> |
| <xs:import namespace="http://xbrl.sec.gov/ecd-sub/2023" schemaLocation="https://xbrl.sec.gov/ecd/2023/ecd-sub-2023.xsd"/> |
| <xs:annotation> |
| | <xs:appinfo> |
| | | <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20240320_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/> |
| | | <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20240320_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/> |
| | | <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="spxc-20240320_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/> |
| | | </xs:appinfo> |
| | </xs:annotation> |
| <xs:element id="spxc_YearEndFairValueOfAwardsGrantedInTheYearMember" abstract="true" name="YearEndFairValueOfAwardsGrantedInTheYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_FairValuesAtVestDateForAwardsGrantedAndVestedInCurrentYearMember" abstract="true" name="FairValuesAtVestDateForAwardsGrantedAndVestedInCurrentYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_DifferenceInFairValuesBetweenPriorYearEndFairValuesAndVestDateFairValuesForAwardsGrantedInPriorYearsMember" abstract="true" name="DifferenceInFairValuesBetweenPriorYearEndFairValuesAndVestDateFairValuesForAwardsGrantedInPriorYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_AdjustmentForSummaryCompensationTablePensionMember" abstract="true" name="AdjustmentForSummaryCompensationTablePensionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_TotalAdjustmentsForEquityAwardsMember" abstract="true" name="TotalAdjustmentsForEquityAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_AdditionsForCurrentYearServiceCostMember" abstract="true" name="AdditionsForCurrentYearServiceCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_GrantDateFairValueOfStockAwardsMember" abstract="true" name="GrantDateFairValueOfStockAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_AdjustmentToCompensationAmountEquityAwards" abstract="false" name="AdjustmentToCompensationAmountEquityAwards" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/> |
| <xs:element id="spxc_DividendsOrDividendEquivalentsNotIncludedTotalCompensationMember" abstract="true" name="DividendsOrDividendEquivalentsNotIncludedTotalCompensationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_IncreaseDeductionInFairValuesForUnvestedAwardsGrantedInPriorYearsMember" abstract="true" name="IncreaseDeductionInFairValuesForUnvestedAwardsGrantedInPriorYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_AdditionsForPriorServiceCostMember" abstract="true" name="AdditionsForPriorServiceCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_ForfeituresDuringCurrentYearEqualToPriorYearEndFairValueMember" abstract="true" name="ForfeituresDuringCurrentYearEqualToPriorYearEndFairValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/> |
| <xs:element id="spxc_TotalAdjustmentsForPensionMember" abstract="true" name="TotalAdjustmentsForPensionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/> |
| </xs:schema> |