BS 2494-1990 Elastomeric seals for joints in pipew

BRITISHSTANDARDBS2494:1990ImplementingAmendmentNo.1notpublishedseparatelySpecificationforElastomericsealsforjointsinpipeworkandpipelinesICS23.040.80BS2494:1990ThisBritishStandard,havingbeenpreparedunderthedirectionoftheRubberStandardsPolicyCommittee,waspublishedundertheauthorityoftheBoardofBSIandcomesintoeffecton31August1990©BSI07-1999BS2494-1FirstpublishedNovember1975BS2494-2FirstpublishedDecember1967Secondedition,asBS2494,February1976ThirdeditionMarch1986FourtheditionAugust1990ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferenceRUM/1Draftforcomment89/43852DCISBN0580188086CommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedbytheRubberStandardsPolicyCommittee(RUM/-)toTechnicalCommitteeRUM/1,uponwhichthefollowingbodieswererepresented:BritishGasCorporationBritishPlasticsFederationBritishPrecastConcreteFederationLtd.BritishRubberManufacturers’AssociationBritishSteelIndustryClayPipeDevelopmentAssociationLtd.DuctileIronProducers’AssociationEngineeringEquipmentandMaterialsUsers’AssociationFibreCementManufacturers’AssociationLtd.InstitutionofGasEngineersInstitutionofProductionEngineersInstitutionofWaterEngineersandScientistsMalaysianRubberProducers’ResearchAssociationMinistryofDefenceRubberandPlasticsResearchAssociationofGreatBritainWaterAuthoritiesAssociationWaterCompaniesAssociationWaterResearchCentreAmendmentsissuedsincepublicationAmd.No.DateofissueComments9262December1997IndicatedbyasidelineinthemarginBS2494:1990©BSI07-1999iContentsPageCommitteesresponsibleInsidefrontcoverForewordii1Scope12Designation13General14Textdeleted35Textdeleted36SealsoftypeT(abovegrounddrainage)37SealsoftypeG(gasandhydrocarbonfluids)38Textdeleted3AppendixAMethodoftensiletestingforsplicedjoints7AppendixBTextdeleted7AppendixCAlternativetensiletestpiece7AppendixDMethodformeasurementoflowtemperaturehardnesschange7AppendixEMethodfordeterminingresistancetoliquidimmersionanddesorption8AppendixFMethodforassessingtheintegrityofmouldedsealsoftypeT8AppendixGRecommendationsforstorageofseals8Figure1—Mouldlayoutforsampleplates6Figure4—Dimensionsofalternativedumb-bell7Table1—Designationofelastomericjointsealsbytypeandapplication2Table2—Flashsize2Table5—PhysicalpropertiesforsealsoftypeT(thermoplasticelastomersforabovegrounduseonly)4Table6—PhysicalpropertiesforsealsoftypeG(gasandhydrocarbonfluids)5Table8—Sustainedextensionforsplicejoints7PublicationsreferredtoInsidebackcoverBS2494:1990ii©BSI07-1999ForewordThisBritishStandardhasbeenpreparedunderthedirectionoftheRubberStandardsPolicyCommitteeandsupersedesBS2494:1986,whichiswithdrawn.BSEN681-1containsrequirementsthatsupersedethosefortypesW,D,HandSinBS2494:1990.BSEN681-2,tobepublishedshortly,willsupersederequirementsforTypeT.BSEN682,whenpublished,willsupersederequirementsforTypeG.NOTEThemannerinwhichsealsarestoredbetweenmanufactureanduseismostimportantanditisrecommendedthattheadvicegiveninAppendixGisfollowed.IthasbeenassumedinthedraftingofthisBritishStandardthattheexecutionofitsprovisionsisentrustedtoappropriatelyqualifiedandexperiencedpersonnel.ToassurethemselvesthatproductsclaimedtocomplywithBS2494consistentlyachievetherequiredlevelofquality,purchasersorderingtothisstandardareadvisedtospecifyintheirpurchasingcontractthatthesupplieroperatesaqualitysystemincompliancewithBS5750-2.WARNING.Thisstandardcallsfortheuseofsubstancesand/orproceduresthatmaybeinjurioustohealthifadequateprecautionsarenottaken.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,pages1to8,aninsidebackcoverandabackcover.Thisstandardhasbeenupdated(seecopyrightdate)andmayhavehadamendmentsincorporated.Thiswillbeindicatedintheamendmenttableontheinsidefrontcover.BS2494:1990©BSI07-199911ScopeThisBritishStandardspecifiesperformancerequirementsandgivesmethodsoftestforonetypeofelastometricjointsealmadeofthermosettingelastomericcompoundsandonetypeofjointsealmadeofthermoplasticelastomericcompounds(seeclause2)andthecompoundsfromwhichtheyaremanufactured.Itisapplicabletoelastomericcomponentsofcompositeornon-compositerings,seals,jointinggaskets,andsimilarcomponentsusedtosealfluidsinpipesandfittings.Otherrequirementsfortheperformanceofthefinishedjointseals,particularlyfunctionaltestsfortheperformanceoftheactualsealingsystemsusedwithparticularpipelinematerials,arespecifiedinappropriateBritishStandards.MethodsoftestaregiveninAppendixAandAppendixCtoAppendixF.RecommendationsforthestorageofsealsaregiveninAppendixG.NOTEThetitlesofthepublicationsreferredtointhisstandardarelistedontheinsidebackcover.2DesignationElastomericjointsealsshallbedesignatedaccordingtotheirintendedapplicationasgiveninTable1.3General3.1MaterialsSealsofthermosettingelastomersshallbemanufacturedfromcompoundsthatarefreefromreclaimedrubber,vegetableoils,facticeandvulcanizedwaste.SealsoftypeTs