BS 6755-1 1986

BRITISHSTANDARDBS6755-1:1986Testingofvalves—Part1:SpecificationforproductionpressuretestingrequirementsUDC621.646:[620.1:532.11]LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunJul1509:08:15GMT+00:002007,UncontrolledCopy,(c)BSIBS6755-1:1986ThisBritishStandard,havingbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton31December1986©BSI12-1998ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePSE/7Draftforcomment85/75573DCISBN0580154793CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbythePipingSystemsComponentsStandardsCommittee(PSE/-)toTechnicalCommitteePSE/7,uponwhichthefollowingbodieswererepresented:AmalgamatedUnionofEngineeringWorkersAssociatedOfficesTechnicalCommitteeAssociationofBronzeandBrassFoundersAssociationofHydraulicEquipmentManufacturersBritishChemicalEngineeringContractors’AssociationBritishCompressedGasesAssociationBritishFoundryAssociationBritishGasCorporationBritishMaritimeTechnologyBritishShipbuildersBritishValveManufacturers’AssociationLtd.CopperDevelopmentAssociationCopperTubeFittingsManufacturers’AssociationElectricitySupplyIndustryinEnglandandWalesEnergyIndustriesCouncilEngineeringEquipmentandMaterialsUsers’AssociationGAMBICA(BEAMALtd.)GeneralCouncilofBritishShippingHealthandSafetyExecutiveInstituteofBritishFoundrymenInstitutionofChemicalEngineersInstitutionofGasEngineersInstitutionofMechanicalEngineersInstitutionofWaterEngineersandScientistsSocietyofBritishGasIndustriesSteelCastingResearchandTradeAssociationWaterAuthorities’AssociationWaterCompanies’AssociationAmendmentsissuedsincepublicationAmd.No.DateofissueCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunJul1509:08:15GMT+00:002007,UncontrolledCopy,(c)BSIBS6755-1:1986©BSI12-1998iContentsPageCommitteesresponsibleInsidefrontcoverForewordiiSection1.General1Scope12Definitions1Section2.Performance3General24Pressure-containingcapabilityofvalveshell25Butterflyvalvediskstrength26Seatleakage27Backseatleakage28Testcertificate2AppendixAEquivalentleakagerates4AppendixBTestdurations4AppendixCEquivalentsizesofvalveshavingflangedends,threadedends,weldendsandcapillaryorcompressionends5AppendixDPressuretests5Table1—Maximumpermissibleseattestleakagerates3Table2—Maximumpermissiblebackseattestleakagerates3Table3—Equivalentleakagerates4Table4—Testdurations4Table5—Equivalentsizesofvalves5PublicationsreferredtoInsidebackcoverLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunJul1509:08:15GMT+00:002007,UncontrolledCopy,(c)BSIBS6755-1:1986ii©BSI12-1998ForewordThisPartofBS6755hasbeenpreparedunderthedirectionofthePipingSystemsComponentsStandardsCommittee.BS6755ispublishedintwoParts:—Part1:Specificationforproductionpressuretestingrequirements;—Part2:1)Specificationforfiretype-testingrequirements.ThisPartofBS6755willsupersedeBS5146-1andBS5146-2andisrelatedtoISO5208-1982,publishedbytheInternationalOrganizationforStandardization(ISO),butisnotequivalentintechnicalcontent.Themaindifferencesareasfollows.a)PressuretestrequirementsspecifiedinBS5146-1havebeenincludedinthisPartofBS6755whicharenotspecifiedinISO5208.b)MoredetailsofthetestmethodsaregiveninthisPartofBS6755.c)MaximumallowableleakageratesfortheseatandbackseattestsaredesignateddifferentlytoISO5208andBS5146-2andthereforeatableofequivalentleakageratesisgiveninappendixA.d)TheminimumdurationsforpressuretestsdonotnecessarilycomplywithISO5208;theactualtestdurationsaregiveninthevalveproductstandards.e)Forguidance,atableoftestdurationsisgiveninappendixBandmaybeusedwhereanappropriatevalveproductstandarddoesnotexistorwheretesttimesarenotspecifiedinastandard.f)Forcomparisonandinformation,atableofequivalentsizesofvalveshavingdifferentendsisgiveninappendixC.ThisPartofBS6755establishesthebasicrequirementsandmethodsfortheproductionpressuretestingofvalves.ItrevisestheproductionpressuretestingrequirementsspecifiedinBS5146-1:1974andBS5146-2:1984bothofwhichwilleventuallybesupersededbythisPartofBS6755andwillbewithdrawn.Inthemeantimevalvesshouldbetested,asappropriate,inaccordancewitheither:ItistheintentiontorefertothisPartofBS6755forproductionpressuretestinginallthevalveproductstandardslistedinthisforewordandthiswillbeachievedeitherbyrevisionstoexistingstandardsorbyamendmentspublishedtoexistingstandards.ItisexpectedthatallvalveswillberequiredtobeproductionpressuretestedinaccordancewiththisPartofBS6755withinadateof2yearsofpublicationofthisstandard.WithinthisperiodBS5146-2:1984willbewithdrawnandtheproductionpressuretestingrequirementsspecifiedinBS5146-1:1974willbedeletedtogetherwithclausescoveringinspectionrequirements.1)Inpreparation1)i)BS5146-1:1974;ii)BS5146-2:1984;iii)therequirementsintherelevantvalveproductstandard;or2)thisPartofBS6755.LicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunJul1509:08:15GMT+00:002007,UncontrolledCopy,(c)BSIBS6755-1:1986©BSI12-1998iiiItisintendedthatthisPartofBS6755beusedinc