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i/.dIMSSSP-25-1998StandardMarkingSystemforValves,Fittings,FlangesandUnionsStandardPracticeDevelopedandApprovedb!ytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.127ParkStreet,NEVienna,Virginia22180(703)281-6613COPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesCOPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesMSSSTANDARDPRACTICESP-25AnMSSStandardPracticeisintendedasabasisforcommonpracticebythemanufacturer,theuser,andthegeneralpublic.TheexistenceofanMSSStandardPracticedoesnotinitselfprecludethemanufacture,sale,oruseofproductsnotconformingtotheStandardPractice.Mandatoryconformanceisestablishedonlybyreferenceinacode,specification,salescontract,orpubliclaw,asapplicable.UnlessotherwisespecificallynotedinthisMSSSP,anystandardreferredtohereinisidentifiedbythedateofissuethatwasapplicabletothereferencedstandard(s)atthedateofissueofthisMSSSP.SeeAnnexA.US.customaryunitsinthisSParethestandard;themetricunitsareforreferenceonly.ISubstantivechangesinthis1998editionare“flagged”byparallelbarsasshownonthemarginsofthisparagraph.Thespecificdetailsofthechangesmaybedeterminedbycomparingthematerialflaggedwiththatinthepreviousedition.IAnypartofthkstandardmqybequotedCreditlinesshouldread‘ExtractedfromMSSSP-25-1998,withpermissionofthepublisher,theManufacturersStandardizationSociety.’ReproductionprohibitedundercopyrightconventionunlesswrittenpermissionisgrantedbytheManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.OriginallyapprovedJuly,1934Copyright0,1978byManufacturersStandardizationSocietyoftheValveandFittingsIndustry,Inc.PrintedinU.S.A.1iCOPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesCOPYRIGHTManufacturersStandardizationSocietyoftheValveandFittingsLicensedbyInformationHandlingServicesMSSSTANDARDPRACTICESP-25FOREWORDTheinitialissueoftheStandardMarkingSystemwasmadebytheManufacturer'sSta...