BS EN 12256-1998 塑料管道系统.热塑配件.纤维配件机械强度和柔韧性的试验方法

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN12256:1998BS2782-11:Method1111F:1998TheEuropeanStandardEN12256:1998hasthestatusofaBritishStandardICS23.040.45NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWPlasticspipingsystemsÐThermoplasticsfittingsÐTestmethodformechanicalstrengthorflexibilityoffabricatedfittings©BSI1998ISBN0580293467BSEN12256:1998AmendmentsissuedsincepublicationAmd.No.DateTextaffectedNationalforewordThisBritishStandardistheEnglishlanguageversionofEN12256:1998.ItisalsoincorporatedintoBS2782MethodsoftestingPlastics:Part11:Thermoplasticspipes,fittingsandvalves,asMethod1111F:1998,forassociationwithrelatedtestmethodsforplasticsmaterialsandplasticspipingsystems.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteePRI/61,Plasticspipingsystemsandcomponents,whichhastheresponsibilityto:Ðaidenquirerstounderstandthetext;ÐpresenttotheresponsibleEuropeancommitteeanyenquiriesontheinterpretation,orproposalsforchange,andkeeptheUKinterestsinformed;ÐmonitorrelatedinternationalandEuropeandevelopmentsandpromulgatethemintheUK.Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.Additionalinformationa)Apparautus(clause3)Forthepurposesof6.1airpressureorvacuummaybeusedinsteadofwaterasthemediumforinternalpressure,inwhichcaserelevantpneumaticsupplyandcontroldeviceswillalsobenecessary.b)WatertemperatureWhenfillingtheassemblywithwaterinaccordancewith6.1or6.2,asapplicable,itisimportantthatthetemperatureofthewaterdoesnotcausethetemperatureofthetestpiecetodeviatefromthespecifiedrangeof(23±5)ÊC.Hencethewaterintroducedshouldbeat(23±5)ÊCorthefilledassemblyshouldbe(re)conditionedat(23±5)ÊCuntiltheassemblyanditscontentsarewithinthattemperaturerangethroughoutbeforecommencingtoapplythenecessaryforce.c)ProcedureWhentestinginaccordancewith6.1theinternalfluidmaybewaterorairpressureoravacuum.Introductionofairpressureorvacuumasalternativestowatertogetherwithrearrangementofthetextofthedraftforpubliccommentmeansthatasratifiednolimitsarespecifiedfortheinternalpressure,norisanyonemediumidentifiedforuseincaseofdispute.Forconsistencywith6.2,theUKtechnicalcommitteemakesthefollowingrecommendations.1)Whenapplyingandmaintainingthenecessaryforcetoobtainthespecifiedmoment,theinternalwaterorairpressureshouldbeequivalenttoawaterheadofbetween200mmand300mmabovethecriticalpoint.2)Ifinspectionisperformedafterrelaxingtheforceordisplacement,theinternalwaterorairpressureorvacuum,asapplicable,shouldbeequivalenttoawaterheadofbetween200mmand300mmabovethecriticalpoint.©BSI1998iBSEN12256:19983)Incaseofdispute,theinternalmediumshouldbewater,unlessotherwisespecifiedinthereferringstandard.Cross-referencesTheBritishStandardswhichimplementinternationalorEuropeanpublicationsreferredtointhisdocumentmaybefoundintheBSIStandardsCatalogueunderthesectionentitledªInternationalStandardsCorrespondenceIndexº,orbyusingtheªFindºfacilityoftheBSIStandardsElectronicCatalogue.Warningnote:ThisBritishStandard,whichisidenticalwithEN12256:1998,doesnotnecessarilydetailalltheprecautionsnecessarytomeettherequirementsoftheHealthandSafetyatWorketc.Act1974.Attentionshouldbepaidtoanyappropriatesafetyprecautionsandthemethodshouldbeoperatedonlybytrainedpersonnel.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.SummaryofpagesThisdocumentcomprisesafrontcover,aninsidefrontcover,pagesiandii,theENtitlepage,pages2to5andabackcover.©1998CENAllrightsofexploitationinanyformandbyanymeansreservedworldwideforCENnationalMembers.Ref.No.EN12256:1998EEUROPEANSTANDARDEN12256NORMEEUROPEÂENNEEUROPAÈISCHENORMMay1998ICS23.040.45Descriptors:plastictubes,pipefittings,thermoplasticresins,sanitation,buriedpipes,tests,mechanicalstrength,flexibilityEnglishversionPlasticspipingsystemsÐThermoplasticsfittingsÐTestmethodformechanicalstrengthorflexibilityoffabricatedfittingsSysteÁmesdecanalisationsenplastiqueÐRaccordsthermoplastiquesÐMeÂthoded'essaidelareÂsistancemeÂcaniqueoudelaflexibiliteÂdesraccordsfaõonneÂsKunststoff-RohrleitungssystemeÐFormstuÈckeausThermoplastenÐPruÈfverfahrendermechanischenFestigkeitoderElastizitaÈtvonhandgefertigtenFormstuÈckenThisEuropeanStandardwasapprovedbyCENon9January1998.CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferencesconcerningsuchnatio