BS EN 12293-2000 塑料管道系统.热水和冷水用热塑管和配件.已安装的组件耐温度变化性能

|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||BRITISHSTANDARDBSEN12293:2000BS2782-11:Method1123T:2000TheEuropeanStandardEN12293:1999hasthestatusofaBritishStandardICS23.040.20;23.040.45NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWPlasticspipingsystemsÐThermoplasticspipesandfittingsforhotandcoldwaterÐTestmethodfortheresistanceofmountedassembliestotemperaturecyclingLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunDec2404:31:07GMT+00:002006,UncontrolledCopy,(c)BSIThisBritishStandard,havingbeenpreparedunderthedirectionoftheSectorCommitteeforMaterialsandChemicals,waspublishedundertheauthorityoftheStandardsCommitteeandcomesintoeffecton15May2000©BSI05-2000ISBN0580349284BSEN12293:2000NationalforewordThisBritishStandardistheofficialEnglishlanguageversionofEN12293:2000.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteePRI/61,Plasticspipingsystemsandcomponents,whichhastheresponsibilityto:Ðaidenquirerstounderstandthetext;ÐpresenttotheresponsibleEuropeancommitteeanyenquiriesontheinterpretation,orproposalsforchange,andkeeptheUKinterestsinformed;ÐmonitorrelatedinternationalandEuropeandevelopmentsandpromulgatethemintheUK.Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitssecretary.TheresponsibleUKcommitteegivesthefollowingadviceconcerningtheuseandinterpretationofthisBritishStandard.a)In3.2a)andin3.3referenceismadetoªwatervelocityº.Thisisresidualtextfromthedraftstandardwhichshouldhavebeenchangedtoreflectredraftingof3.1a),of3.3andofclause7totoremovereferencestowatervelocityand/ortorelateinsteadtothespecifiedlimitsforthetemperaturevariationthroughoutthetestpiece.Forconsistencywiththewordingof3.1a),of3.3andof6.2inEN12293:1999,itisconsideredthatin3.2a)thewordsª(see6.2)ºshouldnowbereadasª(see3.3)º.b)In3.8,thetensioningdeviceisrequiredtostressthepipetothestressgiveninthereferringstandard.Atthetimeofgoingtoprint,neitherthereferringstandardsnorthisstandardprovideenoughdetailtocalculatetheforceneeded.Inprinciple,thisforcecouldbebasedonactualpipedimensions(ifso,thedetailisrequiredastohowandwhereitistobemeasured)ortakenfromthereferringstandard(ifthisisthecasethenthestandardmightchoosetorequireuseofnominalorofspecifiedminimumormaximumvalvesforthethicknessandlikewiseforthediameter;differingresultswillbeobtaineddependingupontheoptionsspecified).Ifastressorforcehastobequantified,thenthisstandardneedsdetailsoftheequationtobeusedrelativetospecificactualornominaldimensionsofthepipe.Theequationcouldbebasedoneithertypeofdimension,takingeitherworst-caseormid-tolerancevalues.AmendmentsissuedsincepublicationAmd.No.DateCommentsLicensedCopy:InstituteOfTechnologyTallaght,InstituteofTechnology,SunDec2404:31:07GMT+00:002006,UncontrolledCopy,(c)BSIBSEN12293:2000©BSI05-2000iIntheabsenceofanyspecificrequirementsinthestandardorspcificationmakingreferencetothisstandard,theresponsibleUKcommitteerecommendsthat3.8isreadasthoughwordedasfollows.ª3.8Tensioningdevice,capableofapplyingtheforce,Fi,necessarytoachievetherequiredinitialtensilestress(see5.3)whentheforceisdeterminedusingthefollowingequation:Fi=0,25π[(dem,max.)22{dem,max.22(emin.+te)}2](1)wheredem,max.isthemaximummeanoutsidediameterspecifiedinthereferrringstandardemin.istheminimumwallthicknessspecifiedinthereferringstandardteisthemaximumpositivetolerancespecifiedforthewallthicknessinthereferringstandard.ºandin5.3,followingªreferringstandardºinsertº(see3.8).c)Inclause4,itema)requiresaminimumofthreepre-stressedpipesforbranchAasshowninFigure1.Thestressconditionsduringthetestmaybesignificantlyaffectedbythenumberofjointsinthatbranchifanymovementispossiblewithineachjoint.UKexperienceindicatesthatthereissomepermanentslipateachpipesocketinterfaceduringthefirstcycle.Thismaybeaslittleas0,5mm.Iftherearesixinterfacesonthestressedlength(oneateachendofthreepipes)thentheremaybeatleast3mmpermanentset.Ifhowever10straightdouble-socketconnectorsareusedtherewouldbe20pipe/socketinterfacesandhenceatleast10mmpermanentset.Thiswouldmakeasignificantdifferencetothestressinthepipeforthedurationofthetest.TheUKcommitteerecommendsthereforethatthenumberofpipesinbranchAshouldnotbemorethanfive,andshouldpreferablybejustthree.Cross-referencesTheBritishStandardswhichimplementinternationalorEuropeanpublicationsreferredtointhisdocumentmaybefoundintheBSIStandardsCatalogueunderthesectionentitledªInternationalStandardsCorrespondenceIndexº,orbyusingtheªFindºfacilityoftheBSIStandardsElectronicCatalogue.WARNINGThisBritishStandard,whichisidenticalwithEN12293:1999,doesnotnecessarilydetailalltheprecautionsnecessarytomeettherequirementsoftheHealthandSafetyatWorketc.Act1974.Attentionshouldbepaidtoanyappropriatesafetyprecautionsandthemethodshouldbeoperatedonlybytrainedpersonnel.ABritishStandarddoesnotpurporttoincludeallthenecessaryprovisionsofacontract.UsersofBritishStandardsareresponsiblefortheircorrectapplication.CompliancewithaBritishStandarddoesnotofitselfconferimmunityfromlegalobligations.Summaryof