1、BRITISH STANDARD BS EN 730-2:2002 Gas welding equipment Safety devices Part 2: Not incorporating a flame (flashback) arrestor The European Standard EN 730-2:2002 has the status of a British Standard ICS 25.160.30 BS EN 730-2:2002 This British Standard, having been prepared under the direction of the
2、 Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 13 November 2002 BSI 13 November 2002 ISBN 0 580 40733 0 National foreword This British Standard is the official English language version of EN 730-2:2002. Together
3、with BS EN 730-1:2002 it supersedes BS EN 730:1995 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee WEE/18, Gas welding appliances, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its
4、 secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic
5、Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to underst
6、and the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises
7、a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EURO
8、PISCHENORM EN7302 October2002 ICS25.160.30 Englishversion GasweldingequipmentSafetydevicesPart2:Not incorporatingaflame(flashback)arrestor MatrieldesoudageauxgazDispositifsdescurit Partie2:Sansarrtdeflamme GasschweigerteSicherheitseinrichtungenTeil2: OhneintegrierteFlammensperre ThisEuropeanStandard
9、wasapprovedbyCENon8August2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicatio
10、ntotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethen
11、ationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Manage
12、mentCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN7302:2002EEN7302:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Designandmaterials .6 4.1 Connections .6 4.
13、2 Materials6 5 Requirements .7 5.1 General7 5.2 Gastightness . 7 5.3 Pressureresistance. 7 5.4 Nonreturnvalve 8 5.5 Pressurereliefvalves 8 5.6 Excessflowcutoffvalves 8 5.7 Flashbackresistance .8 6 Methodsfortypetesting .8 6.1 General8 6.2 Accuracyofpressureandflowmeasurements 8 6.3 Testgases .8 6.4
14、Gastightnesstest 9 6.5 Pressureresistancetest .9 6.6 Nonreturnvalvetest . 9 6.7 Pressurereliefvalves 9 6.8 Excessflowcutoffvalve . .9 6.9 Internalleakagetestforcutoffvalves 10 7 Manufacturersinstructions. .10 8 Marking .10 AnnexA (informative) Gasflowmeasurement12 A.1 General12 A.2 Procedure .12 Ann
15、exB (informative) Thirdpartytestinginformation.14 B.1 General14 B.2 Samplesanddocumentation. .14EN7302:2002(E) 3 Foreword ThisdocumentEN7302:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC121“Welding“,thesecretariat ofwhichisheldbyDS. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,either
16、bypublicationofanidenticaltextor byendorsement,atthelatestbyApril2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby April2003. ThisEuropeanStandard“ GasweldingequipmentSafetydevices ”consistsofthefollowingParts: Part1:Incorporatingaflame(flashback)arrestor. Part2:Notincorporatingaflam
17、e(flashback)arrestor. ThisPartandEN7301supersedesEN730:1995. AnnexesAandBareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,
18、Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN7302:2002(E) 4 1Scope ThisPartofthisEuropeanStandardspecifiesthegeneralrequirementsandtestsforsafetydevicesforfuelgases andoxygenorcompressedairwhichdonotincorporateaflame(flashback)arre
19、storuseddownstreamofmanifold, cylinderand(or)pipelineoutletregulators,andupstreamofblowpipesforwelding,cuttingandalliedprocesses. Thisstandarddoesnotspecifythelocationofthesedevicesinthegassystem. Thisstandarddoesnotincluderequirementsforsafetydeviceswhichincorporateaflamearrestorwhichare coveredbyE
20、N7301. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsap
21、plytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN560, GasweldingequipmentHoseconnectionsforequipmentforwelding,cuttingandalliedprocesses. EN561,Gasweldingequipment Quickactioncouplin
22、gwithshutoffvalvesforwelding,cuttingandallied processes. EN7301:2002, GasweldingequipmentSafetydevicesPart1:Incorporatingaflame(flashback)arrestor. EN29090, Gastightnessofequipmentforgasweldingandalliedprocesses(ISO9090:1989). EN29539, Materialsforequipmentusedingaswelding,cuttingandalliedprocesses(
23、ISO9539:1988). ENISO2503, GasweldingequipmentPressureregulatorsforgascylindersusedinwelding,cuttingandallied processesupto300bar(ISO2503:1998). ENISO7291, GasweldingequipmentPressureregulatorsformanifoldsystemsusedinwelding,cuttingandallied processesupto300bar(ISO7291:1999). ISO554, Standardatmosphe
24、resforconditioningand/ortestingSpecifications. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 excessflowcutoffvalve devicewhichstopsthegasflowintheeventofflowexceedingapredeterminedvalue EXAMPLE Valveisheldopenbyaspring;itcloseswhentheforcecaused
25、bythedynamicpressurebecomesgreaterthan theforceofthespring.Aresettingdeviceisnecessary.EN7302:2002(E) 5 Key 1 Normaldirectionofgasflow Figure1Excessflowcutoffvalve(example) 3.2 maximumoperatingpressure maximumpressuretowhichtheequipmentmaybesubjectedinservice 3.3 multifunctionalsafetydevice devicewh
26、ichincorporatestwoormoreofthesafetyfunctions EXAMPLE Nonreturnvalveandexcessflowcutoffvalve . 3.4 nonreturnvalve devicewhichpreventspassageofgasinthedirectionoppositetoflow EXAMPLE Valveisheldopenbyenergyingasstreamandcloseswhendownstreampressureisapproximatelyequalto orgreaterthanthatinnormaldirect
27、ionofflow.EN7302:2002(E) 6 Key 1 Normaldirectionofgasflow Figure2Nonreturnvalve(example) 3.5 pressurereliefvalve devicewhichautomaticallyventsgaswhenthepressureexceedssomepredeterminedvalueandsealsagainwhen thepressurereturnstowithinspecifiedlimitsofthatvalue EXAMPLE Valveisheldclosedbyaspring;itope
28、nswhenforcecausedbyinternalpressureriseexceedsthespringload. Figure3Pressurereliefvalve(example) 3.6 safetydevice deviceforweldingequipmentwhichavertsriskincaseofmisuseormalfunctionofthedownstreamgaswelding equipment 4 Designandmaterials 4.1Connections ThreadedconnectionsuptoG1shallbeinaccordancewit
29、hEN 560.Quickreleaseconnectionsshallbein accordancewithEN561. 4.2Materials MaterialsusedforsafetydevicesshallconformtotherequirementslaiddowninEN29539.EN7302:2002(E) 7 5Requirements 5.1General AsummaryoftherequirementsandtestsequenceforeachdeviceisgiveninTable1. Table1Summaryofrequirementsandtestseq
30、uenceforsafetydevices Safetydevice function(s) Require ments (Clause No) Tests(intestorder) (ClauseNo) Numberof devicesrequired foreachtest Totalnumberof devicesrequired Nonreturnvalve 5.2.1 5.2.2 5.3 5.4 6.4 Externalgastightness 6.5 Pressureresistance 6.6 Reverseflow 6.9 Internalleakage 5 1 a 5 5 6
31、 Pressurereliefvalve 5.2.1 5.3 5.5 6.4 Externalgastightness 6.5Pressureresistance 6.7 Reliefpressureand flow 5 1 a 5 6 Excessflowcutoff valve 5.2.1 5.2.2 5.3 5.6 6.4 Externalgastightness 6.5Pressureresistance 6.8Excessflowcutoff 6.9 Internalleakage 5 1 a 5 5 6 a Useanewdeviceforthistest.Donotusefora
32、nyothertest. NOTE Inthefollowingsubclauses,theterms“upstream”and“downstream”refertothenormaldirectionofgasflowinthe device. 5.2Gas tightness 5.2.1 Externalgastightness ThegeneralrequirementsonexternalgastightnessandthetestproceduresshallbeinaccordancewithEN29090. 5.2.2 InternalGasTightness Whereinte
33、rnalgastightnessisrequiredinthisstandardtheleakagerateshallnotexceed50cm 3 /hfordevices withaconnectioninternalbore(diameter)lessthan11mmor0,41 d 2 forlargerdiameters(fortestssee6.6and/or 6.9). NOTE Thevalue0,41 d 2 istheflowincm 3 /hwhere distheinternalbore(diameter)inmmofthelargestconnectionofthe
34、device. 5.3Pressure resistance Thehousingsofthesafetydevicesshallresistapressureequaltotentimesthemaximumoperatingpressure,with thetestpressureinallcasesnotlessthan60bar 1 ). 1 ) 1bar=0,1MPa=10 5 Pa 1Pa=1N/m 2 Allpressuresaregaugepressure.EN7302:2002(E) 8 Whenthedeviceistestedinaccordancewith6.5,nop
35、ermanentdeformationofthepressureretainingcomponents shalloccurafteratestdurationofatleast5min. 5.4 Nonreturnvalve Nonreturnvalveshallnotallowthereverseflowofgaseswhentestedinaccordancewith6.6. 5.5 Pressurereliefvalves Theopeningpressureofthepressurereliefvalveshallbebetween1,3and2timesthemaximumoper
36、ating pressurespecifiedbythemanufacturerandthevalveshallcloseatapressurebetween1and2 timesthis pressure.Theyshallbeleakprooftotherequirementsof5.2.1atallpressuresuptoandincludingthemaximum operatingpressure.Theyshallbecheckedinaccordancewith6.7. Themanufacturershallstatetheflowcapacitytoatmosphereas
37、measuredattwicetheoperatingpressure. Ifapressurereliefvalveisincorporatedinaregulator,itshallbeinaccordancewithEN ISO 2503or ENISO7291asapplicableanddoesnotbelonganymoretothescopeofthisstandard. 5.6 Excessflowcutoffvalves Excessflowcutoffdevicesshallstopthegasflowwhentheflowreachesbetween1,1and2time
38、sthenominalflow ratespecifiedbythemanufacturewhentestedinaccordancewith6.8. 5.7Flashback resistance Safetydevicesusedinapplicationswhereflashbackmayoccurshallconformtotherequirementsofthisstandard afterexposuretoflamearrestortestperformedaccordingtoEN7301:2002,6.7,wheretheflamearrestoris replacedbyt
39、hesafetydevicetobetested. 6 Methodsfortypetesting 6.1General Thetestmethodsinthissectionarenotintendedasproductioninspectiontests,butaretobeappliedtosample devicestobetestedforcompliancewiththisstandard.Testsshallbecarriedoutonnewdeviceswithallsafety functionsoperationalasdesigned. Thirdpartyconform
40、itytestingisnotarequirementofthisstandard.SeeannexBforinformationrelatingtothird partyconformitytestingifrequired. 6.2 Accuracyofpressureandflowmeasurements Theallowabletotalerrorofthemeasuredvaluesareasfollows: flow 10%; pressure 3%. Allflowsandpressuresshallbeexpressedinstandardatmosphericconditio
41、nsinaccordancewithISO554.All pressurevaluesaregivenasgaugepressure,expressedinbars. 6.3Test gases Unlessotherwisestated,testsshallbecarriedoutatambientpressureconditionsandat(20 5)C with air or nitrogenfreefromoilandgrease.EN7302:2002(E) 9 Airisconsideredasoilfreeifitcomprises: lessthan510 6 ofoilva
42、pour;and lessthan1mg/m 3 ofsuspendeddroplets. Inallcases,testsshallbecarriedoutwithdrygaswithamaximummoisturecontentcorrespondingtoadewpoint of0C. Safetydevicesforhydrogenshallbetestedwithhydrogenorheliumforthegastightnesstestonly. 6.4 Gastightnesstest Conformitywiththerequirementsof5.2.1shallbechec
43、kedonfivesamplesinaccordancewithEN29090. 6.5Pressure resistance test Conformitywiththerequirementsof5.3shallbecheckedbymeansofahydraulicpressuretestononesample.No othertestsshallbecarriedoutonthesampleeitherbeforeorafterthistestnorshallthesampletestedbeusedfor anyotherpurposes. 6.6 Nonreturnvalvetest 6.6.1 General Conformitywiththerequirementsof5.4shallbecheckedonfivesamplesasfollows.Beforeproceedingwiththis test,passthetestgasthrou
