1、BRITISH STANDARD BS EN 13625:2002 Non-destructive testing Leak test Guide to the selection of instrumentation for the measurement of gas leakage The European Standard EN 13625:2001 has the status of a British Standard ICS 19.100 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWB
2、S EN 13625:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 05 March 2002 BSI 05 March 2002 ISBN 0 580 39203 1 National foreword This Briti
3、sh Standard is the official English language version of EN 13625:2001. The UK participation in its preparation was entrusted to Technical Committee WEE/46, Non-destructive testing, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to it
4、s secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI St
5、andards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquire
6、rs to understand the text; present to the responsible 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
7、 front cover, an inside front cover, the EN title page, pages 2 to 19 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 EUROPISCHENORM EN13625 Dece
8、mber2001 ICS19.100 Englishversion NondestructivetestingLeaktestGuidetotheselectionof instrumentationforthemeasurementofgasleakage EssaisnondestructifsContrledtanchitGuidepour laslectiondesinstrumentsutilisspourlemesuragedes fuitesgazeuses ZerstrungsfreiePrfungDichtheitsprfungAnleitungzur AuswahlvonG
9、ertenzurMessungvonGasleckagen ThisEuropeanStandardwasapprovedbyCENon5October2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcern
10、ings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthes
11、amestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENOR
12、MALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN13625:2001EEN13625:2001(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .
13、4 4 TracergasmethodGroupAtechniques(gasflowingintoobject) 4 4.1 EquipmentandMaterialrequiredforallgroupAtechniques .4 4.2 Vacuumtechnique .5 5 TracergasmethodGroupBtechniques(gasflowingoutoftheobject) 6 5.1 EquipmentandmaterialsrequiredforallgroupBtechniques. 6 5.2 Ammoniatechnique(B.1). .7 5.3 Vacu
14、umboxtechnique,forlargeenclosuresoropenwalls(B.2.1,B.2.2) 7 5.4 Enclosuretechniques(B.3,B.6). 8 5.5 Directsampleprobingtechnique(B.4). .8 5.6 PressurizingEvacuationtechnique(B.5). .8 5.7 Sealedobjectbyvacuumtechnique(B.6). 9 6 BubbletestmethodGroupCtechniques. .9 6.1 Immersiontechnique(C.1). .9 6.2
15、Liquidapplicationtechnique(C.2) .10 6.3 Liquidtechniquewithvacuumbox 10 7 TotalpressurechangemethodGroupDtechniques. 11 7.1 EquipmentandMaterialrequiredforallgroupDtechniques .1 1 7.2 Pressuredecaytechnique(D.1) .11 7.3 Pressurerisetechnique(D.2) . 12 7.4 Pressurechangetest(bellpressurechangeD.3) .
16、12 7.5 Flowmeasurementtechnique(D.4) .13 Bibliography 19EN13625:2001(E) 3 Foreword ThisEuropeanStandardhasbeenpreparedbyTechnicalCommitteeCEN/TC138“Nondestructivetesting“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidentica
17、ltextor byendorsement,atthelatestbyJune2002,andconflictingnationalstandardsshallbewithdrawnatthelatestby June2002. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finla
18、nd, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden, SwitzerlandandtheUnitedKingdom.EN13625:2001(E) 4 1Scope ThisEuropeanStandardspecifiescriteriafortheselectionofequipmentfortheleakdetectionmethodsdescribedin EN1779.Theminimumrequirementsfortheperform
19、anceoftheinstrumentsusedarealsogivenasaguidelinefor personnelinvolvedintesting.Thedefiniteselectionofaninstrumentforagiventestiswithintheresponsibilityofa qualifiedoperator(atminimumlevel2qualificationseeEN473). 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisio
20、nsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthe
21、latesteditionofthe publicationreferredtoapplies(includingamendments). EN13308, NondestructivetestingTerminologyPart8:Termsusedinleaktightnesstesting. EN1779:1999, NondestructivetestingLeaktestingCriteriaformethodandtechniqueselection. 3 Termsanddefinitions ForthepurposesofthisEuropeanStandard,theter
22、msanddefinitionsgiveninEN13308apply. InthisdocumentthemethodsandtechniquesarereferredtotheannexAoftheEN1779:1999. 4 TracergasmethodGroupAtechniques(gasflowingintoobject) 4.1 EquipmentandMaterialrequiredforallgroupAtechniques 4.1.1Leak detector Inthistypeoftest,aleakdetector(LD)ofthemassspectrometert
23、ype(MSLD)accordingtotheminimum requirementsofTable1isused. 4.1.2 Calibrationleaks Atleastonecalibrationleakfordischargetovacuumoragainstatmosphericpressureshallbeused.Theseare usedforthedirectcalibrationoftheMLSD(ifabuiltincalibrationleakdoesnotexist)orforsystemcalibration (responsetime,sensitivity)
24、.Ifrequired,standardleaksshallbeused.SeeTable2. 4.1.3 Auxiliarypumpingsystem Anauxiliarypumpingsystemshouldbeusedif: theobjectvolumeordesorptiongasloadaretoolargeforthebuiltinpumpsoftheMSLD; theleakageratetobemeasuredistoolargeforthemeasurementrangeoftheMSLD. Theauxiliaryvacuumpumpingsystemshallcomp
25、lywiththeminimumrequirementsofTable4.EN13625:2001(E) 5 4.1.4Connections Pipesandvalvesofsuitableconductancewithaportforvacuumpressuremeasurement,previouslytestedfor tightnesssothattheycannotinfluencethetestresults,arerequiredfor: connectionoftheobjecttotheMSLD; connectionofthecalibrationleaktothesys
26、tem; connectionoftheobjecttotheauxiliarypumpingsystem(ifnecessary). Thereshouldbeadevicefordischargingthetracergasoutsidethetestarea. 4.1.5Tracer gas Puretracergasoraknownandhomogeneousmixturecontainingtracergasshallbesuppliedtoensure repeatability. 4.1.6 Testconditionmeasurements Calibratedpressure
27、gaugesandthermometersarerequiredtomonitortheobjectconditions.Ifrequired,ambient condition(pressure,temperatureandhumidity)shallalsobemeasured.Responsetimeshallbemeasured. 4.1.7 Cleaninganddryingmaterialandequipment Solventsordegreasingagentsshallbeavailabletocleanthesurfacestobetested.Dryingisimport
28、anttoeliminate vapoursthatcanincreasetheevacuationtimeorcaninterferewithtracergasdetection. 4.2 Vacuumtechnique 4.2.1 Vacuumtechniquetotal(A.1) 4.2.1.1 Hoodorrigidchamber Thehoodcanbefabricatedfromaplasticfilmthatisabletoencloseentirelytheobject.Itshouldbeleaktight enoughtokeepthetracergasconcentrat
29、ionconstant. Therigidchambershallbeleaktightandenclosetheobjectentirely.Itshouldalloweasyhandlingofthetestobject. Itshallbeevacuabletopurgetheinternalvolume.Suitablecrossinginthewallsshallallowtheconnections.The chamberpressureshallbemeasured. NOTE Theenclosureshouldpresentaleakagerate10timeslesstha
30、nthemaximumallowedratespecified. 4.2.1.2Time measurement Ifthetestisperformedusinganaccumulationtechnique,thetimefromtheinitialtracergasapplicationshallbe measured. 4.2.2 Vacuumtechniquepartial(A.2) 4.2.2.1 Cupsorpartialhoods Partsoftheoutersurfaceoftheobjectarecoveredtoadmitselectivelythetracergast
31、otheareasundertest.Cups shallhavesoftedgesorgasketstoadhereasmuchaspossibletothesurface. Theplastichoodsshallbesealed,forexamplewithadhesivetape.Itshouldbeleaktightenoughtokeepthetracer gasconcentrationconstant.EN13625:2001(E) 6 4.2.3 Vacuumtechnique(local)(A.3) 4.2.3.1 Spraygun Aspraygunwithregulat
32、ingvalveisneeded.Ifatracergasmixtureisrequiredforthetest,themixturecanbe obtainedusingaproportioningspraygun. 4.2.3.2 Calibrationleak Aconductanceleak,calibratedfordischargetovacuumshallbeusedtoverifytheresponsetimeandthesignal amplitudeatthescanningspeed. Thiscalibrationleakshouldbeinthesamerangeas
33、theexpectedmaximumleakagerate. 5 TracergasmethodGroupBtechniques(gasflowingoutoftheobject) 5.1 EquipmentandmaterialsrequiredforallgroupBtechniques 5.1.1Leak detector ExceptfortheAmmoniaTechnique(B.1)aleakdetectorwithrecorderisrequired.Theleakdetector(exceptfor bombingtest)shallbeabletosampleatarelat
34、ivelyhighpressure(20kPato100kPa).TheMSLDshallhavea regulatinginletvalveorasamplingprobetoadjusttheinletpressuretothemaximumworkingpressure. 5.1.2 Calibrationleaks Calibrationleaksfordischargetoatmosphereshallbeused.Theseleaksshouldhavealeakagerateclosetothe maximumallowableinthecaseofacceptancetesto
35、rclosetotheminimumrateinleaklocation. 5.1.3 Testconditionmeasurements Calibratedpressuregaugesarerequiredtomonitortheobjectpressure.Ifnecessary,overpressureprotection devicesshallbeusedtoavoiddamagetotheobjectanddangertopersonnel.Ifrequired,theobjecttemperature andambientconditions(pressure,temperat
36、ureandhumidity)havealsotobemeasured. Responseandimpregnationtimeshallbemeasured. 5.1.4Connections Pipingsystem,withportforpressureand,ifnecessary,temperaturemeasurement,previouslytestedforleak tightness,isrequiredfor: fillingtheobjectwithtracergas; connecting(ifnecessary)anyenclosuretotheLDandtothep
37、umpingsystem. Pipingsystemisalsorequiredtodischargethetracergasoutsidetheareawherethetestisbeingconducted. 5.1.5Gases Puretracergasoraconstantmixturecontainingtracergasshallbesuppliedatthepressurerequiredforthetest. Otherdry(ordried)gasesarenecessaryforpurgingtheobjectortheenclosures.EN13625:2001(E)
38、 7 5.2 Ammoniatechnique(B.1) 5.2.1 Chemicalmaterial Thereagentsaregenerallycolourchangingcompounds,eitherinliquidformorsupportedonpaperband.Their reactivityshallbeverifiedbeforethetest. Forpreparationaftercleaning,passivationusingdilutenitricacid(avolumefractionof5%)isrequired.The applicationofthere
39、agentismadeusingaspraygunorabrush.Warm,dryairorinertgas,isneededtodrythe appliedreagent.Thepaperbandisfixedwithadhesivetape. Thetracergasshallbedryammoniaoracertifiedmixtureofammoniaininertgas,havingapressureand concentrationsufficienttomeetthetestspecifications. 5.2.2 Drying,pressurization,ammoniad
40、ischarge Asuitablepumpingsystemisnecessaryfordryingafterthecleaningpassivation,forpressurizationwithammonia mixtureandfortheremovaloftracergasfromthesystem. 5.2.3 Pressureandconcentrationcontrol Anabsolutegaugewithafullscalerangeof0,4Mpato0,5MPaisneededforevacuation/pressurization monitoring. Ammoni
41、aconcentrationshallbecheckedusingreactivetubesinthefollowingranges: concentrationfortest:range 1%to10% . 10%to100%; concentrationafterpurging:range 510 6 to50010 6 . 0,0510 6 to510 6 . pHIndicatingequipmentisrequiredtocheckthewastesbeforethedischarge. 5.2.4 Ammoniadisposalequipment Equipmenttodischa
42、rgeandtreatusedammonia,inaccordancewithlocalregulations,shallbeused. 5.2.5 Illuminationandvisualequipment Thereagentcoveredsurfaceshallbeexaminedwithwhitelight,eitherdirectlyorwithinstrumentsabletoshow spotslargerthan1mm.Aminimumilluminationof350lxshallbeattainedandmeasured. 5.3 Vacuumboxtechnique,f
43、orlargeenclosuresoropenwalls(B.2.1,B.2.2) 5.3.1 Vacuumbox Therigidvacuumboxshallhaveasoftsealtoadhereaseffectivelyaspossibletotheobjectwall.Theleak tightnessofthissealisveryimportanttoincreasethetestsensitivityandtominimizetheinletofcontaminatedair fromtheambient. 5.3.2 Pumpingsystem Thepumpingsystemshallbeabletoachieveandmaintainthevacuumboxpressureataspecifiedlevel.EN13625:2001(E) 8 5.3.3 Cupsorspraygun Foropenobjectsthetracergasisappliedontheoppositesideofthewallusingcups,bagsoraspraygun. 5.4 E
