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  <xsd:element id="ppih_EffectiveIncomeTaxRateReconciliationDeferredTaxOnUnremittedEarningsAmount" name="EffectiveIncomeTaxRateReconciliationDeferredTaxOnUnremittedEarningsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="ppih_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomeInclusion" name="EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomeInclusion" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="ppih_EstimatedEarnings" name="EstimatedEarnings" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="ppih_ExpenseRelatedToEncashment" name="ExpenseRelatedToEncashment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="ppih_FinanceAndOperatingLeaseLiabilityMaturityTableTextBlock" name="FinanceAndOperatingLeaseLiabilityMaturityTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_FinanceLeaseObligationsMember" name="FinanceLeaseObligationsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_FinanceLeasePrincipalPaymentsAndInterestPaymentOnLiability" name="FinanceLeasePrincipalPaymentsAndInterestPaymentOnLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_FinanceLeasesAssetsMember" name="FinanceLeasesAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_FinanceVehicleEquipmentOneMember" name="FinanceVehicleEquipmentOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_ForeignRevolvingLinesMember" name="ForeignRevolvingLinesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_ForeignSales" name="ForeignSales" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_IncreaseDecreaseInContractWithCustomerAssetAndLiability" name="IncreaseDecreaseInContractWithCustomerAssetAndLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="ppih_IncreaseDecreaseInCustomerDeposits1" name="IncreaseDecreaseInCustomerDeposits1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="ppih_InterestRateForFinanceLease" name="InterestRateForFinanceLease" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_LesseeOperatingAndFinanceLeasesTextBlock" name="LesseeOperatingAndFinanceLeasesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_LineOfCreditFacilityAdditionalFeesToBeIncurred" name="LineOfCreditFacilityAdditionalFeesToBeIncurred" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="ppih_LineOfCreditFacilityCapitalExpendituresRestrictions" name="LineOfCreditFacilityCapitalExpendituresRestrictions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="ppih_LineOfCreditFacilityCovenantFixedChargeCoverageRatio" name="LineOfCreditFacilityCovenantFixedChargeCoverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_LineOfCreditFacilityCovenantTermsEbitdaRatioTermOne" name="LineOfCreditFacilityCovenantTermsEbitdaRatioTermOne" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant"/>
  <xsd:element id="ppih_LineOfCreditFacilityCovenantTermsEbitdaRatioTermTwo" name="LineOfCreditFacilityCovenantTermsEbitdaRatioTermTwo" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant"/>
  <xsd:element id="ppih_LineOfCreditFacilityFixedChargeCoverageRatioRequired" name="LineOfCreditFacilityFixedChargeCoverageRatioRequired" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_LineOfCreditFacilityMaximumBorrowingCapacityAvailabilityBlock" name="LineOfCreditFacilityMaximumBorrowingCapacityAvailabilityBlock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="ppih_LongtermDebtCurrentMaturitiesExcludingNorthAmericanRevolvingLine" name="LongtermDebtCurrentMaturitiesExcludingNorthAmericanRevolvingLine" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="ppih_MortgageNoteSecuredByTennesseeManufacturingFacilityMember" name="MortgageNoteSecuredByTennesseeManufacturingFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_NorthAmericanLoanPartiesMember" name="NorthAmericanLoanPartiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
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  <xsd:element id="ppih_OtherComprehensiveIncomeLossDefinedBenefitPlanActuarialGainArisingDuringPeriodAfterTax" name="OtherComprehensiveIncomeLossDefinedBenefitPlanActuarialGainArisingDuringPeriodAfterTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="ppih_OtherGeographicalAreaMember" name="OtherGeographicalAreaMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_OutsideCommissionsPayableCurrent" name="OutsideCommissionsPayableCurrent" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="ppih_PaycheckProtectionProgramCARESActMember" name="PaycheckProtectionProgramCARESActMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_PercentOfProceedsFromIssuanceOfDebtUsedForPayrollRelatedExpenses" name="PercentOfProceedsFromIssuanceOfDebtUsedForPayrollRelatedExpenses" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_PercentOfRevenueFromContractWithCustomerIncludingAssessedTax" name="PercentOfRevenueFromContractWithCustomerIncludingAssessedTax" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_PlumbersPipefittersLocal572PensionFundMember" name="PlumbersPipefittersLocal572PensionFundMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_ProceedsFromPaymentsForStockOptionsExercisedAndTaxesRelatedToRestrictedSharesVested" name="ProceedsFromPaymentsForStockOptionsExercisedAndTaxesRelatedToRestrictedSharesVested" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="ppih_RevolvingCreditLinesUsedByMiddleEasternSubsidiaries3Member" name="RevolvingCreditLinesUsedByMiddleEasternSubsidiaries3Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_RevolvingCreditLinesUsedByMiddleEasternSubsidiaries4Member" name="RevolvingCreditLinesUsedByMiddleEasternSubsidiaries4Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="ppih_SpecialtyPipingSystemsAndCoatingMember" name="SpecialtyPipingSystemsAndCoatingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="ppih_SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" name="SupplementalBalanceSheetInformationRelatedToLeasesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_TheCompanyAndItsSubsidiariesMember" name="TheCompanyAndItsSubsidiariesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="ppih_statement-statement-note-2-significant-accounting-policies-inventories-details" name="statement-statement-note-2-significant-accounting-policies-inventories-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-2-significant-accounting-policies-longlived-assets-details" name="statement-statement-note-2-significant-accounting-policies-longlived-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <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-5-debt-debt-by-type-details" name="statement-statement-note-5-debt-debt-by-type-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-5-debt-maturities-details" name="statement-statement-note-5-debt-maturities-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-5-debt-tables" name="statement-statement-note-5-debt-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-6-leases-lease-costs-details" name="statement-statement-note-6-leases-lease-costs-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-6-leases-maturities-of-lease-liabilities-details" name="statement-statement-note-6-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-6-leases-supplemental-balance-sheet-information-related-to-leases-details" name="statement-statement-note-6-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-6-leases-tables" name="statement-statement-note-6-leases-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-6-leases-weightedaverage-lease-terms-and-discount-rates-details" name="statement-statement-note-6-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-7-income-taxes-components-of-income-tax-expensebenefit-details" name="statement-statement-note-7-income-taxes-components-of-income-tax-expensebenefit-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-income-taxes-deferred-tax-assets-details" name="statement-statement-note-7-income-taxes-deferred-tax-assets-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-income-taxes-income-tax-reconciliation-details" name="statement-statement-note-7-income-taxes-income-tax-reconciliation-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-income-taxes-income-taxes-loss-income-before-income-taxes-details" name="statement-statement-note-7-income-taxes-income-taxes-loss-income-before-income-taxes-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-income-taxes-tables" name="statement-statement-note-7-income-taxes-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-7-income-taxes-uncertain-tax-positions-details" name="statement-statement-note-7-income-taxes-uncertain-tax-positions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-asset-allocation-details" name="statement-statement-note-8-retirement-plans-asset-allocation-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-assumptions-details" name="statement-statement-note-8-retirement-plans-assumptions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-benefit-obligations-plan-assets-and-funded-status-of-plan-details" name="statement-statement-note-8-retirement-plans-benefit-obligations-plan-assets-and-funded-status-of-plan-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-cash-flows-details" name="statement-statement-note-8-retirement-plans-cash-flows-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-components-of-net-periodic-benefit-cost-details" name="statement-statement-note-8-retirement-plans-components-of-net-periodic-benefit-cost-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-multiemployer-details" name="statement-statement-note-8-retirement-plans-multiemployer-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-8-retirement-plans-tables" name="statement-statement-note-8-retirement-plans-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-9-stockbased-compensation-restricted-stock-activity-details" name="statement-statement-note-9-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-9-stockbased-compensation-stock-option-activity-details" name="statement-statement-note-9-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-9-stockbased-compensation-stockbased-compensation-expense-details" name="statement-statement-note-9-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-9-stockbased-compensation-tables" name="statement-statement-note-9-stockbased-compensation-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-note-9-stockbased-compensation-unvested-option-activity-details" name="statement-statement-note-9-stockbased-compensation-unvested-option-activity-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-schedule-ii-valuation-and-qualifying-accounts-tables" name="statement-statement-schedule-ii-valuation-and-qualifying-accounts-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="ppih_statement-statement-schedule-ii-valuation-and-qualifying-accounts-valuation-allowance-details" name="statement-statement-schedule-ii-valuation-and-qualifying-accounts-valuation-allowance-details" 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>
