BS EN 1704-1997 塑料管道系统.热塑塑料阀.弯曲情况下温度循环后阀门完整性的试验方法P

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN1704:1997BS2782:Part11:Method1133B:1997TheEuropeanStandardEN1704:1997hasthestatusofaBritishStandardICS23.060.01NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWPlasticspipingsystemsÐThermoplasticsvalvesÐTestmethodfortheintegrityofavalveaftertemperaturecyclingunderbending©BSI1997ThefollowingBSIreferencesrelatetotheworkonthisstandard:CommitteereferencePRI/61Draftforcomment95/120948DCISBN0580273784AmendmentsissuedsincepublicationAmd.No.DateTextaffectedCommitteesresponsibleforthisBritishStandardThepreparationofthisBritishStandardwasentrustedtoTechnicalCommitteePRI/61,Plasticspipingsystemsandcomponents,uponwhichthefollowingbodieswererepresented:BritishGasPlcBritishPlasticsFederationBritishPlumbingFittingsManufacturers'AssociationBritishValveandActuatorManufacturers'AssociationCharteredInstitutionofWaterandEnvironmentalManagementDepartmentoftheEnvironment(BritishBoardofAgreÁment)DepartmentoftheEnvironment(BuildingResearchEstablishment)DepartmentofTransportElectricityAssociationHealthandSafetyExecutiveInstituteofBuildingControlInstituteofMaterialsInstitutionofCivilEngineersInstitutionofGasEngineersNationalAssociationofPlumbing,HeatingandMechanicalServicesContractorsPipelineIndustriesGuildPlasticsLandDrainageManufacturers'AssociationSocietyofBritishGasIndustriesSocietyofBritishWaterIndustriesWaterCompaniesAssociationWaterServicesAssociationofEnglandandWalesThefollowingbodieswererepresentedinthedraftingofthisstandard,throughsubcommitteesandpanels:ERATechnologyLtd.EngineeringEquipmentandMaterialsUsers'AssociationRAPRATechnologyLtd.©BSI1997iContentsPageCommitteesresponsibleInsidefrontcoverNationalforewordiiForeword2Method1Scope32Normativereferences33Principle34Apparatus35Testpieces36Procedure47Testreport4Figure1Schematicarrangementforbendingradiustest5©BSI1997BSEN1704:1997NationalforewordThisBritishStandardhasbeenpreparedbyTechnicalCommittePRI/61andistheEnglishlanguageversionofEN1704:1996PlasticspipingsystemsÐThermoplasticsvalvesÐTestmethodfortheintegrityofavalveaftertemperaturecyclingunderbending,publishedbytheEuropeanCommitteeforStandardization(CEN).ItisincorporatedintoBS2782Methodsoftestingplastics:Part11:Thermoplasticspipes,fittingsandvalves,asMethod1133B:1997,forassociationwithrelatedtestmethodsforplasticsmaterialsandplasticspipingcomponents.ThistestmethodhasbeenpreparedforreferencebyotherstandardsunderpreparationbyCENforspecificationofplasticspipingandductingsystemsandcomponents.Ithasbeenimplementedtoenableexperienceofthemethodtobegainedandforuseforotherfreshapplications.Itisalsoforusefortherevisionoramendmentofothernationalstandardsaspracticable,butitshouldnotbepresumedtoapplytoanyexistingstandardorspecificationwhichcontainsormakesreferencetoadifferenttestmethoduntilthatstandard/specificationhasbeenamendedorrevisedtomakereferencetothismethodandadjustanyrequirementsasappropriate.Cross-referencesPublicationreferredtoCorrespondingBritishStandardEN837-1:1996BSEN837:1997PressuregaugeÐPart1:BourdontubepressuregaugesÐDimensions,metrology,requirementsandtestsEN28233BSEN28233:1992ThermoplasticsvalvesÐTorqueÐTestmethodEN45501:1993[BS2782:Part11:Method1131:1992]BSEN45501:1994Specificationformetrologicalaspectsofnon-automaticweighinginstrumentsNOTE1.Inthedescriptors,theterm`cocks'shouldbereadas`valves'.NOTE2.In4.1,thespecificationofthebendingframegiveninthefirstparagraphcorrespondstothatfortestingalengthofpipeunderbending,forwhichaconstantbendingradiuscanbeachieved.Thiscannotbeachievedforatestpieceinwhichasignificantportioncomprisesarelativelystiffvalvebody.Itisnecessarythereforetointerpretfigure1asrequiringdisplacementofthevalvebodybythespecifiedradialdistancefromitspositionbetweentwostraightpipesbeforebendingisapplied.Dependingontherelativelengthsandstiffnessofthevalvebodyandthetwoadjacentpipeswhichcompletethespanshowninfigure1,theradiusofbendingoftheactualpipesmaydifferfromandcannotbeexpectedorrequiredtoconformtoaconstantradiusof25dn.NOTE3.In4.1,referencehasbeenintroducedtoaspecificclassificationinaccordancewithEN45501,whichshouldthereforehavebeenlistedasadatedreferenceinclause2.NOTE4.In5.1.1,referencehasbeenintroducedtothe`MRS-class'ofthematerialsofthepipesandthevalve,withoutreferencetothebasisthereof.TheTechnicalCommitteeconsidersthistobeareferencetotheclassificationnumberaccordingtoENISO12162:1995(≡BSENISO12162:1996andBS2782:Part11:Method1121:1996)Warningnote.ThisBritishStandard,whichisidenticalwithEN1704:1997,doesnotnecessarilydetailalltheprecautionsnecessarytomeettherequirementsoftheHealthandSafetyatWorketc.Act1974.Attentionshouldbepaidtoanyappropriatesafetyprecautionsandthemethodshouldbeoperatedonlybytrainedpersonnel.Inpa