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  <xsd:element abstract="true" id="ppih_RevolvingCreditLinesUsedBySaudiArabianSubsidiaryMember" name="RevolvingCreditLinesUsedBySaudiArabianSubsidiaryMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_RevolvingLinesNorthAmericaMember" name="RevolvingLinesNorthAmericaMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_SIBORMember" name="SIBORMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresOrRetirementsForTaxesWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresOrRetirementsForTaxesWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_SpecialtyPipingSystemsAndCoatingMember" name="SpecialtyPipingSystemsAndCoatingMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeitedOrRetiredForTaxes" name="StockIssuedDuringPeriodSharesRestrictedStockAwardForfeitedOrRetiredForTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_StockRepurchaseProgramAuthorizedRepurchaseAmountUsed" name="StockRepurchaseProgramAuthorizedRepurchaseAmountUsed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="ppih_SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" name="SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_SupplementalCashFlowInformationRelatedLeasesTableTextBlock" name="SupplementalCashFlowInformationRelatedLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_TransferredAtPointInTimeUsingInputMethodMember" name="TransferredAtPointInTimeUsingInputMethodMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_TransferredAtPointInTimeUsingOutputMethodMember" name="TransferredAtPointInTimeUsingOutputMethodMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_WeightedaverageLeaseTermsAndDiscountRatesTableTextBlock" name="WeightedaverageLeaseTermsAndDiscountRatesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-lease-costs-details" name="statement-statement-note-11-leases-lease-costs-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-maturities-of-lease-liabilities-details" name="statement-statement-note-11-leases-maturities-of-lease-liabilities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-supplemental-balance-sheet-information-related-to-leases-details" name="statement-statement-note-11-leases-supplemental-balance-sheet-information-related-to-leases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-supplemental-cash-flow-information-related-to-leases-details" name="statement-statement-note-11-leases-supplemental-cash-flow-information-related-to-leases-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-tables" name="statement-statement-note-11-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-11-leases-weightedaverage-lease-terms-and-discount-rates-details" name="statement-statement-note-11-leases-weightedaverage-lease-terms-and-discount-rates-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-12-restricted-cash-summary-of-cash-cash-equivalents-and-restricted-cash-details" name="statement-statement-note-12-restricted-cash-summary-of-cash-cash-equivalents-and-restricted-cash-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-12-restricted-cash-tables" name="statement-statement-note-12-restricted-cash-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-15-treasury-stock-repurchases-of-common-stock-details" name="statement-statement-note-15-treasury-stock-repurchases-of-common-stock-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-15-treasury-stock-tables" name="statement-statement-note-15-treasury-stock-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-4-revenue-recognition-reconciliation-of-the-cost-in-excess-of-billings-details" name="statement-statement-note-4-revenue-recognition-reconciliation-of-the-cost-in-excess-of-billings-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-4-revenue-recognition-revenues-by-revenue-class-details" name="statement-statement-note-4-revenue-recognition-revenues-by-revenue-class-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-4-revenue-recognition-tables" name="statement-statement-note-4-revenue-recognition-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-6-impairment-of-longlived-assets-goodwill-details" name="statement-statement-note-6-impairment-of-longlived-assets-goodwill-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-6-impairment-of-longlived-assets-tables" name="statement-statement-note-6-impairment-of-longlived-assets-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-stockbased-compensation-restricted-stock-activity-details" name="statement-statement-note-7-stockbased-compensation-restricted-stock-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-stockbased-compensation-stock-option-activity-details" name="statement-statement-note-7-stockbased-compensation-stock-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-stockbased-compensation-stockbased-compensation-expense-details" name="statement-statement-note-7-stockbased-compensation-stockbased-compensation-expense-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-stockbased-compensation-tables" name="statement-statement-note-7-stockbased-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-9-earnings-per-share-summary-of-earnings-per-share-details" name="statement-statement-note-9-earnings-per-share-summary-of-earnings-per-share-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-9-earnings-per-share-tables" name="statement-statement-note-9-earnings-per-share-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
