1、BRITISH STANDARD BS EN 730-1:2002 Gas welding equipment Safety devices Part 1: Incorporating a flame (flashback) arrestor The European Standard EN 730-1:2002 has the status of a British Standard ICS 25.160.30 BS EN 730-1:2002 This British Standard, having been prepared under the direction of the Eng
2、ineering 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 40732 2 National foreword This British Standard is the official English language version of EN 730-1:2002. Together with
3、 BS EN 730-2:2002 it supersedes BS EN 730:1995 which is withdrawn.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 sec
4、retary. 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 Cata
5、logue 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 understand
6、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 a fr
7、ont cover, an inside front cover, the EN title page, pages 2 to 20, 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 EUROPISC
8、HENORM EN7301 October2002 ICS25.160.30 Englishversion GasweldingequipmentSafetydevicesPart1:Incorporatinga flame(flashback)arrestor MatrieldesoudageauxgazDispositifsdescurit Partie1:Avecarrtdeflamme GasschweigerteSicherheitseinrichtungenTeil1:Mit integrierterFlammensperre ThisEuropeanStandardwasappr
9、ovedbyCENon8August2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheM
10、anagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenational
11、standardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCen
12、tre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN7301:2002EEN7301:2002(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Designandmaterials .7 4.1 Connection .7 4.2 Materi
13、als7 5 Requirements .7 5.1 General7 5.2 Gastightness . 9 5.3 Pressureresistance. 9 5.4 Flamearrestor 9 5.5 Flamearrestorwithnonreturnvalve 9 5.6 Flamearrestorwithtemperaturesensitivecutoffvalve. 9 5.7 Flamearrestorwithpressuresensitivecutoffvalve 9 5.8 Othermultifunctionalsafetydevices .10 6 Methods
14、fortypetesting .10 6.1 General10 6.2 Accuracyofpressureandflowmeasurements 10 6.3 Testgases .10 6.4 Gastightnesstest 10 6.5 Pressureresistancetest .10 6.6 Nonreturnvalvetest . 11 6.7 Flamearrestortest. 11 6.8 Temperaturesensitivecutoffvalvetest .13 6.9 Pressuresensitivecutoffvalvetest . 14 6.10 Inte
15、rnalleakagetestforcutoffvalves . .14 7 Furthertests . 14 8 Manufacturersinstructions. .14 9 Marking .15 AnnexA (informative) Gasflowmeasurement17 A.1 General17 A.2 Procedure .17 AnnexB (informative) Thirdpartytestinginformation.19 B.1 General19 B.2 Samplesanddocumentation. .19 AnnexC (informative) P
16、roductiontests .20 C.1 General20 C.2 Productionflashbacktest. 20EN7301:2002(E) 3 Foreword ThisdocumentEN7301:2002hasbeenpreparedbyTechnicalCommitteeCEN/TC121“Welding“,thesecretariat ofwhichisheldbyDS. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor
17、 byendorsement,atthelatestbyApril2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby April2003. ThisEuropeanStandard“ GasweldingequipmentSafetydevices ”consistsofthefollowingParts: Part1:Incorporatingaflame(flashback)arrestor. Part2:Notincorporatingaflame(flashback)arrestor. ThisPartan
18、dEN7302supersedesEN730:1995. AnnexesA,BandCareinformative. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembou
19、rg,Malta,Netherlands,Norway,Portugal,Spain, Sweden,SwitzerlandandtheUnitedKingdom.EN7301:2002(E) 4 1Scope ThisPartofthisEuropeanStandardspecifiesthegeneralrequirementsandtestsforsafetydevicesforfuelgases andoxygenorcompressedairincorporatingaflame(flashback)arrestoruseddownstreamofmanifold, cylinder
20、 and(or)pipelineoutletregulators,andupstreamofblowpipesforwelding,cuttingandalliedprocesses. Thisstandarddoesnotspecifythelocationofthesedevicesinthegassystem. Thisstandarddoesnotincluderequirementsforsafetydeviceswhichdonotincorporateaflamearrestorwhichare coveredbyEN7302. Thisstandarddoesnotcovert
21、heuseofsafetydevicesincorporatingflamearrestorsforapplicationswithpremixed oxy/fuelorair/fuelgassupplysystems,forexampledownstreamofgasmixersorageneratortoproduce hydrogen/oxygenmixturebyelectrolyticdecompositionofwater. 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference
22、,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedrefe
23、rencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN560, GasweldingequipmentHoseconnectionsforequipmentforwelding,cuttingandalliedprocesses. EN561,Gasweldingequipment Quickactioncouplingwithshutoffvalvesforwelding,cuttingandallied processes. EN7302, GasweldingequipmentSa
24、fetydevicesPart2:Notincorporatingaflame(flashback)arrester. EN29090, Gastightnessofequipmentforgasweldingandalliedprocesses(ISO9090:1989). EN29539, Materialsforequipmentusedingaswelding,cuttingandalliedprocesses(ISO9539:1988). ISO554, Standardatmospheresforconditioningand/ortestingSpecifications. 3
25、Termsanddefinitions ForthepurposesofthisEuropeanStandard,thefollowingtermsanddefinitionsapply. 3.1 flamearrestor devicewhichquenchesaflamefront EXAMPLE Thegoodthermalconductivity,highporosityandsmallporesize(largersurface)ofsinteredmetalelements leadtoflamequenching.EN7301:2002(E) 5 Key 1 Normaldire
26、ctionofgasflow 2 E.g.sinteredmetalelement 3F l a m e Figure1Flamearrestor(example) 3.2 maximumoperatingpressure maximumpressuretowhichtheequipmentmaybesubjectedinservice 3.3 multifunctionalsafetydevice devicewhichincorporatestwoormoreofthesafetyfunctions EXAMPLE Flamearrestorwithnonreturnvalveandcut
27、offvalve . NOTE Thetemperaturesensitivecutoffvalveisnormallyusedincombinationwithaflamearrestorasitspurposeistocut offthegasflowbeforethetemperatureattheflamearrestorreachesapointwhereflametransmissionacrosstheflamearresto r takesplace.Itisnormalforpressureandortemperaturecutoffvalvesonlytobeusedinc
28、ombinationwithflamearrestors.D ue totheburningcharacteristicsofhydrogenitisrecommendedallflamearrestorsforhydrogenincorporateatemperature sensitivecutoffvalve. 3.4 nonreturnvalve devicewhichpreventspassageofgasinthedirectionoppositetoflow EXAMPLE Valveisheldopenbyenergyingasstreamandcloseswhendownst
29、reampressureisapproximatelyequalto orgreaterthanthatinnormaldirectionofflow.EN7301:2002(E) 6 Key 1 Normaldirectionofgasflow Figure2Nonreturnvalve(example) 3.5 pressuresensitivecutoffvalve devicewhichstopsthegasflowintheeventofabackpressurewavefromthedownstreamside EXAMPLE Valveisheldopen,e.g.byaspri
30、ng;itisactuatedbyapressurewavefromdownstreamandisthen automaticallyheldclosedbyaspecialdevice. Key 1 Normaldirectionofgasflow 2 Backpressurewave Figure3Pressuresensitivecutoffvalve(example) 3.6 temperaturesensitivecutoffvalve devicewhichstopsthegasflowwhenapredeterminedtemperatureisexceeded EXAMPLE
31、Valveisheldopen,e.g.byafusiblemetal,andactuatedbysustainedtemperaturerise.EN7301:2002(E) 7 Key 1 Normaldirectionofgasflow 2 E.g.fusiblemetal Figure4Temperaturesensitivecutoffvalve(example) 3.7 safetydevice deviceforweldingequipmentwhichavertsriskincaseofmisuseormalfunctionofthedownstreamgaswelding e
32、quipment 4 Designandmaterials 4.1Connection ThreadedconnectionsuptoG1shallbeinaccordancewithEN 560.Quickreleaseconnectionsshallbein accordancewithEN561. 4.2Materials MaterialsusedforsafetydevicesshallconformtotherequirementslaiddowninEN29539. 5Requirements 5.1General Requirementsforeachsafetydevicev
33、arydependinguponthedeviceandcombinationoffunctionsinthedevice.A summaryoftherequirementsandtestsequenceisgiveninTable1.EN7301:2002(E) 8 Table1Summaryofrequirementsandtestsequenceforthemostcommonlyavailablesafetydevices Safetydevice function(s) Require ments (Clause No) Tests(intestorder) (ClauseNo)
34、Numberof devicesrequired foreachtest Totalnumberof devicesrequired Flamearrestor 5.2.1 5.3 5.4 6.4Externalgastightness 6.5Pressureresistance 6.7Flashbackresistance 5 1 a 5 6 Flamearrestor+non returnvalve 5.2.1 5.2.2 5.3 5.5 6.4Externalgastightness 6.5Pressureresistance 6.6Reverseflow 6.7Flashbackres
35、istance 6.6Reverseflow 5 1 a 5 5 5 6 Flamearrestor+ temperaturesensitive cutoffvalve 5.2.1 5.2.2 5.3 5.6 6.4Externalgastightness 6.5Pressureresistance 6.7Flashbackresistance 6.8Temperaturecutoff 6.10Internalleakage 5 1 a 5 1 a 5 7 Flamearrestor+non returnvalve+ temperaturesensitive cutoffvalve 5.2.1
36、 5.2.2 5.3 5.5 5.6 6.4Externalgastightness 6.5Pressureresistance 6.6Reverseflow 6.7Flashbackresistance 6.6Reverseflow 6.8Temperaturecutoff 6.10Internalleakage 5 1 a 5 5 5 1 a 5 7 Flamearrestor+non returnvalve+ pressuresensitive cutoffvalve 5.2.1 5.2.2 5.3 5.5 5.7 6.4Externalgastightness 6.5Pressurer
37、esistance 6.6Reverseflow 6.9Pressurecutoff 6.10Internalleakage 6.7Flashbackresistance 6.6Reverseflow 6.9Pressurecutoff 6.10Internalleakage 5 1 a 5 5 5 5 5 5 5 6 Flamearrestor+non returnvalve+ temperaturesensitive cutoffvalve+ pressuresensitive cutoffvalve 5.2.1 5.2.2 5.3 5.5 5.6 5.7 6.4Externalgasti
38、ghtness 6.5Pressureresistance 6.6Reverseflow 6.9Pressurecutoff 6.10Internalleakage 6.7Flashbackresistance 6.6Reverseflow 6.9Pressurecutoff 6.10Internalleakage 6.8Temperaturecutoff 6.10Internalleakage 5 1 a 5 5 5 5 5 5 5 1 a 5 7 a Useanewdeviceforthistest.Donotuseforanyothertest. NOTE Inthefollowings
39、ubclauses,theterms“upstream”and“downstream”refertothenormaldirectionofgasflowinthe device.EN7301:2002(E) 9 5.2Gas tightness 5.2.1 External gastightness ThegeneralrequirementsonexternalgastightnessandthetestproceduresshallbeinaccordancewithEN29090. 5.2.2 Internalgastightness Whereinternalgastightness
40、isrequiredinthisstandardtheleakagerateshallnotexceed50cm 3 /hfordevices withaconnectioninternalbore(diameter)lessthan11mmor0,41 d 2 forlargerdiameters(see6.6and/or6.10for tests). NOTE Thevalue0,41 d 2 istheflowincm 3 /hwhere distheinternalbore(diameter)inmmofthelargestconnectionofthe device. 5.3Pres
41、sure resistance Thehousingsofthesafetydevicesshallresistapressureequaltotentimesthemaximumoperatingpressure,with thetestpressureinallcasesnotlessthan60bar 1 ). Whenthedeviceistestedinaccordancewith6.5,nopermanentdeformationofthepressureretainingcomponents shalloccurafteratestdurationofatleast5min. 5
42、.4Flame arrestor Flamearrestorsshallquenchflashbackswhentestedinaccordancewith6.7. 5.5 Flamearrestorwithnonreturnvalve Flamearrestorwithnonreturnvalveshallquenchflashbackswhentestedinaccordancewith6.7andshallnot allowthereverseflowofgaseswhentestedinaccordancewith6.6bothbeforeandaftertheflashbacktes
43、t6.7. 5.6 Flamearrestorwithtemperaturesensitivecutoffvalve Flamearrestorwithtemperaturesensitivecutoffvalveshallquenchflashbackswhentestedinaccordancewith6.7 andshallstopthegasflowbeforetheupstreamgasisignitedwhentestedinaccordancewith6.8. Itshallnotbepossibletoresetthetemperaturesensitivecutoffvalve. Ifthetemperaturesensitivecutoffvalveoperatesbeforethefifthflashbackintest6.7andtheflameisnot transmittedupstreamtheunitshallbeconsideredtomeettheflashbacktestrequirement,buttest6.8shallstillbe carriedoutonanewunit. 5.7 Flamearrestorwithpressure
