BS EN 13625-2002 Non-destructive testing - Leak test - Guide to the selection of instrumentation for the measurement of gas leakage《无损检验 泄漏试验 气体泄漏测量用仪表选择指南》.pdf

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