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TheworktointroducegascylinderrequirementsintotheUNModelRegulationwillbeamajor   undertakingthattheexpertfromtheUSanticipateswilltakemorethanonebienniumtocomplete.Tocarryoutthisworkinanorderlyfashionitwillbenecessarytoprioritizetheworkonthebasisofthesignificancetointernationaltradeandtheavailabilityofinternationallyagreed(ISO)standards.Onthisbasis,theexpertfromtheUSbelievesthattheworkinthecurrentbienniumshouldfocusonrequirementsforseamlesssteelandaluminumgascylinders,smallweldedcylinderswithacapacitylessthan150liters,acetylenecylindersUK.,US.,v#XtXXXtW#XtXXXtԀandMEGCs.Workoncryogenicgascontainers,pressuredrums Y (weldedgasreceptacleswithacapacitygreaterthan150liters)andcylindersmadeofmaterialsotherthatsteeloraluminum(i.e.,compositecylinders)shouldbedelayeduntilthefollowingbienniumoratleastuntiltheworkoncylindersissubstantiallycompleted.2.  Whileitisrecognizedthatthereareavastquantityofcylinderscurrentlyinexistencethatin #0!# somewaymustbedealtwithinthemodalregulations,theCommitteeconsistentwiththeapproachforportabletanks,shoulddirectitsefforttoincluderequirementsfornewcylindersthatmaybetransportedinternationally.UseofexistingcylindersshouldatthispointbelefttothemodeswiththeCommitteeperhapsgivingsomeguidanceonhowtheyshouldbedealtwithoncerequirementsfornewcylindersarecompleted.RequirementstobeincludedintheModelRegulationmayofcoursetakeaccountofrequirementsinexistingregulations.Limitingthescopeoftheworktonew internationallytransportablecylinderswillvastlyenhancetheabilityoftheworkinggrouptocompletetheworkofdevelopingrequirementsfortheModelRegulation.3.  Thescopeoftheworkongascylindersshouldincludedesignandconstructionstandards,quality --h*- assuranceprovisionsapplicabletothemanufacturecylinders,cylindermarkingrequirements,reinspectionrequirementsandselectionanduselimitationsforindividualgases.TheUSisconductingananalysisoftestfrequencyrequirements,fillinglimitsandspecialrequirementsforcylindersusedtotransportspecificgasesandwouldprefertodelaydevelopmentofpackinginstructionsuntillaterinthebienniumwhenthisworkiscompleted. 1/2 Ї4.  AsevidencedinthedocumentsbyISOandCanadaconsiderableinternationalefforthasalready e beendirectedtowardtheestablishmentofsuitableinternationalrequirements.TothegreatestextentpossibletheworkoftheCommitteeshouldavailitselfofthestandardsdevelopedbyISO.However,inlimitedinstances,whenitisfoundthatnoISOstandardsexistforaparticularrequirementorwhentherequirementsinanapplicableISOstandardarefoundunacceptableotherstandardsshouldbeused.Whennecessary,deviationsfromtheISOstandardsshouldbeenteredintheUNModelRegulation.Certainrequirementssuchasmarking,periodictestintervals,minimumtestpressures,fillingrequirementsandcylinderapprovalprovisionsareregulatoryissuesandshouldbecoveredintheUNModelRegulation#XtXXXt # SpecificComments  8  1.   Definitions 󀄀Adefinitionfortestpressureshouldbedeveloped.Thedefinitionintheprevious u  draftforsettledpressureshouldbeincorporated( Settledpressure thepressureofthecontentofthe e  pressurereceptaclewhenthetemperatureofthecontainedgasis15.X,T*XXXt#XtX*X.X,T#C.USUK.,).Wedonotagreethatworking U  pressureshouldbedefinedasafunctionofsettledpressure.WorkingpressureV  shouldbedefinedWԀasfollows: V  WWX  WYorkingpressure isthemaximumpressuretowhichareceptaclemayV  beWpressurizedwhilebeing  transported.Theworkingpressureshallnotexceedtwothirdsofthetestpressureat65CXtXXXtUK.,US.,<USUK.,.  Thedefinitionfor Compressedgasshouldberevisedasfollows: Compressedgas 󀄀apermanentgasorgasmixturewithacriticaltemperaturebelow10C. L ThisisconsideredtobemoreconsistentwiththeISO11622definition. < Thedefinitionfor Liquefiedgasshouldberevisedasfollows:#XtXXXtC#XtXXXt?+ 4 <DL!X?UK.,US.,| Liquefiedgas agasorgasmixturewhichispartiallyliquidattemperaturesabove  #XtXXXt8#XtXXXtUSUK.,10UK.,US.,a#XtXXXtB#C.Adistinction Q ismadebetween: Highpressureliquefiedgas gaseswithacriticaltemperaturebetween10Cand70C " ?+ 4 <DL!X? Lowpressureliquefiedgas gaseswithacriticaltemperatureaboveUSUK.,XtXXXt70#XtXXXt#XtXXXtUK.,US.,C.#XtXXXtR#XtXXXtUSUK.,Ԁ #! 2.   Valveprotection 󀄀Inadditiontotherequirementsproposedin4.1.6.1.4oftheEIGAproposal, %l # webelievethatfortoxicandflammablegasesUK.,US.,#XtXXXt#Ԁaperformancetestshouldbeadoptedtoensurethatthe &\!$ valvesareadequatelyprotectedwhentheyarenotoverpacked,placedinaprotectiveframeorplacedinsidetheneckofthepressurereceptacleandprotectedbyascrewthreadedplug.Reviewofaccidentsbetween1988through1997involvingcylindersintheUSrevealedthatdamagedvalvesaccountedformorethan30%oftheaccidentalreleasesfromseamlesscylindersintransportation.ThetestwouldencompassadropasspecifiedinISO11117exceptthatwewouldpreferadropheightmoreconsistentwiththeonespecifiedforPGIpackagings(i.e.1.8_metres_).Thetextwouldstate Exceptwhenvalvesareprotectedasspecifiedin(a),(e)and(f),pressurereceptaclesusedforgasesmeetingthecriteriaofDivisions2.1and2.3shallbefittedwithvalveswhichareprotectedinamannercapableofwithstandingtheperformancetestspecifiedinISO11117atadropheightof1.8metres.  /*. & d  3.   Referencetotechnicalstandards 󀄀TheUSdoesnotagreewiththeapproachEIGAhastaken e inincorporatingthestandardsintotheUNModelRegulation.EIGAproposesthatonlyessentialsafetystandardsbeincorporatedintotheModelRegulationandproposesastatementthat Thefollowingrequirementsofthegeneralconditionsofpackingareconsideredtohavebeencompliedwithifthefollowingstandards,asrelevantareapplied..TheUSfindsthistextextremelyvagueandunacceptablefromaregulatoryperspectivesinceitwouldbeverydifficulttoenforce.'de#TheUSagreesthatonlyessentialsafetyrequirementsneedbeincorporatedintotheModelregulation,butbelievesthatthetechnicalstandardsfordesignandconstructionofpressurereceptaclesprovideessentialsafetystandards.Webelievethatthestandardsneedtobeincorporatedbyreferenceineachcasewhereconformancetothestandardoraspecificpartofthestandardisrequired.TheEIGAapproachoflistingallthestandardsinparagraph6.2.2isnotspecificenoughforpurposesofdefiningcylinderdesign,constructionanduserequirementsfromaregulatoryandenforcementperspective.Someofthestandardsreferenceddonotapplytodesignandconstruction.Insomecasesnotalloftherequirementsinaparticularstandardarenecessarytobemetandinothercasesthestandardsdonotprovideanadequatelevelofsafety.ThiswillneedtobeindicatedintheModelRegulationwithspecificreferencetowhichpartsofaparticularstandarddonotapply.ProvisionsfordeviatingfromthestandardswhenthelatestscientificandtechnologicaladvancesofferequivalentsafetyshouldbealsobeincludedintheModelRegulation.4.   PressureReliefDevices(PRDs) 󀄀TheUSnotesthatthereisadifferenceinphilosophyinthe t useofPRDsbetweenEuropeandtherestoftheworld.Carefulconsiderationinvolvingconsultationwithemergencyresponders,gasreceptacleusersandmanufacturerswillbenecessaryinordertodevelopconsensusontheuseofPRDs.AdetailedandcomprehensiveriskanalysismayneedtobeperformedtoweighthesafetyaspectsofamendingcurrentPRDrequirements.Asystematicapproachtospecifyingforbidden,optionalormandatoryuseofPRDsfortypesofgasesandcylindertypesandsizeswillneedtobedeveloped.TheUShasnotyetfinalizeditspositioninthisregard.TheUSbelievesthatlargepressurereceptaclessuchas3000litretubesduetothestoredpotentialenergyshouldbefittedwithapressurereliefdeviceinallinstances.TheworkinggroupshouldconsideravolumelimitforwhichPRDsshouldbemandatoryandshouldconsiderasystematicapproachtospecifyingthetypesofgaseswhichmayormaynothavePRDs.5.  Maximumfillingratios 󀄀TheUSisnotconvincedthatfillingratios/densitiesneedtobe "  includedintheModelregulation.Incontrast,wewouldpreferthatperformancecriteriafordeterminingfillingratiosbeincludedintheModelRegulation.Industrycouldpublishfillingratiosonthebasisoftheperformancecriteriatotheircustomerstoeasetheburdenonfillersfromhavingtocalculatefillingdensity.TheUSisconsideringthefillingformulasprovidedintheEIGAproposalbasedonISO11622fornonpermanentgases.Theseformulasinsomecasesyieldlessconservativevaluesthanthoseforsubstanceswherethepropertiesarewellknownandvaluesarespecifiedincurrentregulations.TheUSisstudyingtheseformulasandmayproposealternativeformulasforestablishingfillinglimits.TheUShascomparedthemaximumfillingratiosintheEIGAproposalwiththosein49CFRandinISO11622forpermanentgasesandhasfoundthatthevaluesarefairlyconsistent.TheUSwillprovidespecificcommentsrelevanttothepermanentgasfillingratioswhicharenotconsistentonceithascompleteditsworkinthisregard.6.  Gastables(packinginstructions) 󀄀ThegastableinP200willneedcarefulreviewand .)- consideration.Thetableprovidesminimumtestpressures,fillingratios,testintervals,andspecialrequirements.TheUSisintheprocessofreviewingtherequirementsinthetableandwillprovidecommentsoncethereviewiscompleted. 1P,0 7.   Designandconstructionrequirements 󀄀Someoftherequirementsprovidedin6.2.1.1,Design e andconstructionarenotnecessarysincetheyarecoveredinthetechnicalstandards.Thetechnicalstandardsshouldbeincorporatedbyreferencedirectlyinthedesignandconstructionsection.Onlydeviationsfromthestandardswhicharerequiredforregulatorysafetyreasonsshouldbeincludedinthissection(i.e.thatisiffromaregulatory/transportationsafetyperspectiveitisdeemednecessarytoprovidemoreorlesssevererequirements).AnotherconcernisthatISOstandard11120,98091and98092allowregionalinternationalagreementstoestablishcriticaldesignformulaconstants(i.e.the Ffactor).Thismustbeaddressedintheregulations.Thereisalsoaprovisiontoallowaproofpressuretestinlieuofthejackettestattimeofmanufacture.Thisneedstobeconsidered.8.  Periodicinspection 󀄀TheUSwouldprefernottospecifythatV  NonDestructiveExamination <  (W8_NDV  E_)W8X  TYԀtestingmayonlybeusedwhenapprovedbythecompetentauthority.Thisapproachwillnotpromoteharmonizationandtheunrestrictedtransportofgasreceptacles.TheUSbelievesthissectionneedstoprovidegreaterdetailedrequirementsconcerningtheuseofX  NYX  oYX  nYX  ԄYX  DYX  eYX  sYX  tYX  rYX  uYX  cYX  tYX  iYX  vYX  eYX  ԀYX  TYX  eYX  sYX  tYX  ԀYX  (Y_NDV  E_W<X  TYX  )Ymethods.&  ?+ 4 <DL!X?ӀForinstance,V  UltrasonicExamination(_UE_)shouldbemandatoryWr=forhighstrengthpressurereceptaclesdesignedandconstructedinaccordancewithISO98092X  UYX  TYX  ԀYX  sYX  hYX  oYX  uYX  lYX  dYX  ԀYX  bYX  eYX  ԀYX  mYX  aYX  nYX  dYX  aYX  tYX  oYX  rYX  yYԀandV  optionalW@forthosedesignedinaccordancewith98091,7866and11120V  .W@X  ԀYX  UYX  TYX  ԀYX  mYX  aYX  yYX  ԀYX  bYX  eYX  ԀYX  oYX  pYX  tYX  iYX  oYX  nYX  aYX  lYX  .YԀSincethereisnoacceptableISOstandardavailablefor_UV  E_WwCX  TYԀoracousticemissions(AE)testing,otherstandardssuchasASTMandCENstandardsmayneedtobereferenced.TheCompressedGasAssociationiscurrentlydevelopingguidancedocumentsforconductingrequalificationofcylindersusingacousticemissionsandultrasonicinspectionprocedures.Inaddition,theModelRegulationshouldincorporaterequirementsforthecertificationofNDTpersonnelforinspectionofcylinders/tubes.TheworkinggroupshouldconsiderAmericanSocietyforNondestructiveTesting,Inc._Rcommended_PracticeNo._ASNT_ԀTC1Aorotherequivalentstandards(e.g.BS)asaminimumrequirementforNDTpersonnelqualification/certification.InspectorsshouldbecertifiedtoatleastLevelIIrequirements.Recommendedcriteriaforconducting_UE_Ԁduringperiodicinspectionandproceduresforpersonnelqualificationforperforming_UE_ԀareprovidedinAnnex2ofthispaper.ThefollowingaresuggestedreferencestoISOstandardsforperiodicinspectionofpressurereceptacles:̄0  Refillablesteelreceptacleswithtensilestrengthlessthan950MPashallbeperiodicallyinspected ! inaccordancewithISO6406:1992.'U=  # # ̄0  Refillableseamlesssteelreceptacleswithtensilestrengthequaltoorgreaterthan950MPashall #t! beperiodicallyinspectedinaccordancewithISO6406:1992exceptultrasonicexaminationdescribedinsection6.2.1.5.4(seeAnnex_2)_Ԁmustbeusedinlieuofhydraulictestandinternalvisualinspection.  # # ̄0  RefillableseamlessaluminiumreceptaclesshallbeperiodicallyinspectedinaccordancewithISO u(#& 10461:1993  # # ̄0  RefillableacetylenereceptaclesshallbeperiodicallyinspectedinaccordancewithISO 9+%) 10462:1994  # # ̄0  Ultrasonicexaminationmaybeusedasanalternativetohydrostatictestingandinternalvisual -(, inspectionofsteelandaluminiumreceptacleswithtensilestrengthlessthan950MPa.3X u,XXXt.)- # # #XtX,X3X uL#XtXXXtUSUK.,A# /p*Ā0  ASTM1419providesacousticemissiontestprocedures.0\+/ # #  1H,0 L 6Eh(#)2L 2   2[N2Eh  9  .3  0    PeriodicRetestIntervals 󀄀TherearedifferencesintheRID/ADRand49CFRretest2[NN݌e # # Ќ  intervals.Thetestintervalswillneedtobeconsideredbytheworkinggroupandharmonizedonthebasisofasystematicapproachtakingintoaccounttheperiodicityrequirementsfordifferentgroupsofgasesandthetypesofpressurereceptacle.However,somecylinders,especiallythoseusedintheUnitedStatesareusedforawidevarietyofdifferenttypesofgases(corrosiveornoncorrosivegases).Thismakesitdifficulttobaseretestintervalssolelyonthetypeofgasesbeingtransported.TheUSdoesnotsupporta3yearintervalforcorrosivegases.Studiesontheeffectsofwallthicknessandcorrosiondonotjustifythe3yeartestinterval.TheUSintendstoprovidejustificationforuseofa5yeartestintervalforcorrosivegases.TheUSrequirementsdifferfromtheEuropeanrequirementsinthattheUSrequirementsestablishtestintervalsonthebasisofthegasandthetypeofcylinderusedtotransportthegas.TheUSbelievesthatthecylindertype(e.g.seamlessorwelded,highstrengthorlowstrength)shouldbeafactorindeterminingtheretestinterval.Forinstanceinourviewaweldedcylindermayrequiremorefrequentinspectionsascomparedtoaseamlesscylinderdependentonthetypesofgasesitisusedtotransport.10.  Markings 󀄀TheUSproposesuseofauniversalUNpermanentlystampedmarkforcylinders. =  TheproposedUNmarkissimilartothepackagecertificationmarkingsrequiredonotherUNpackagings(seeAnnex_1)._11.   Approvalofpressurereceptacles 󀄀TheUSbelievesthatrequirementsontheapprovalof  cylinderdesignsandconstructionshouldbeincludedintheUNModelRegulation.WorkbyISOTC58/WG9inthisregardalongwiththetextproposedbyEIGAcouldbeusedasabasisforthiswork.  @    Annex1 e VProposedManufacturersCylinderMarkings : = (a)  UNmark;pV?<,(`~"rA `xxEY   p   (b)  thenumberofthetechnicalstandard(e.g.ISO98091)towhichthepressurereceptacleis   designedandconstructed;(c)  testpressureinbar; R  (d)  thedate(monthandyear)oftheinitialinspection; *  (e)  thecountryauthorizingthemark; g  (f)  thenameortheregisteredmarkofthemanufacturer*; ? (g)  theserialnumberofthepressurereceptacleprovidedbythemanufacturer;  (h)  theidentifyingmarkoftheauthorizedbodywhocarriedoutthetestsandinspections;  Thesemarksshallbepermanentlystamped,engravedoretchedonthepressurereceptacle.Themarkingsshallbeontheshoulder,topheadorneckofthepressurereceptacleoronapermanentlyaffixedcomponentofthepressurereceptacle(e.gweldedcollar).Othermarkingsareallowedprovidedtheyaremadeinlowstressareasotherthanthesidewallandarenotofasizeanddepththatwillcreateharmfulstressconcentrations.Suchmarksshallnotconflictwithrequiredmarkings.#XtXXXtM#UK.,US.,&MUSUK.,Thefollowingtwoitemsmaybeusefulmarkingsbutshouldnotbepartofthecertificationmarking.Thetareweightmaychangedependentontheserviceequipmentfittedonacylinder.Thisinformationcouldbemarkedelsewhereonthecylinderandmaynotneedtobemarkedinapermanentmanner.̄0  thetareofthepressurereceptacle(foracetylenecylinders,thetareshallincludethemassofthe " porousmaterial,thesolvent,andsaturationgas)inkilograms;  # # ̄0  thewatercapacityinlitres;%^ " # #  WW##0  servicepressureinbar.'6"$ W # pVD<,(`~0I#k `t-E(kkWc(pItmaybeusefultoincludeanadditionalmarkonseamlesscylindersdesignedtoISO9809-1whichhaveatensilestrengthgreaterthan950_Mpa_Ԁtoindicatethattheyarenotsuitableforthetransportofgasesthatcancausehydrogen_embrittlement_.Weareconsideringamarksuchas: ##WWUK.,US.,\   *TheregisteredmarkscouldbemaintainedbytheUNSecretariatandpublishedontheUN .(+ Transportwebsiteforeaseofaccess . .),   /*-    Annex2  e b6.2.1.5.4 TestMethodforUltrasonicExaminationofSeamlessMetalReceptacles  = Thistestmethodcoversaprocedurefordetectingandevaluatingdiscontinuitiessuchasareacorrosion,isolatedpits,linecorrosionandfatiguecrackinmetalreceptaclesusingpulsereflectionultrasoniccontactimmersionstraightandanglebeamtechniques.Ī  UltrasonicTestingEquipment  d Theultrasonicequipment(UT)equipmentshallconsistofapulseechotestinstrumentthatiscapable,ataminimum,ofgenerating,receiving,andpresentinghighenergypulsesinanAscan,Bscan,orCscandisplay.Itshallhaveafrequencyrangeof1MHzto10MHz.TheUTequipmentmustcontinuallymonitortheacousticcouplingtoassure100%receptaclesidewallcoverageduringthetestingandautomaticallyterminatetestingoralarmtheUTsystemifthecouplingislost.Ifcouplingislost,theUToperatorhastheoptionofterminatingthetesttodeterminetheproblemandreexaminingtheareaswherethecouplingwaslost.Theequipmentshallbecapableofprovidingacomparisonofcrackdepthtothatofaknownreferencereflector.Theequipmentcalibrationshallbeperformedforeachtypeofreceptacletobeexaminedusingthestandardizationreference(calibrationstandard)totesting.Ataminimum,theequipmentcalibrationshallbeverifiedatthebeginningofeachworkshift,at4hourintervals,andattheendoftheworkshift.Ifthecalibrationisfoundtobelessconservativeafteranyverificationcheck,allreceptaclestestedsincethelastacceptablecalibrationshallbereexamined.CalibrationshallalsobeverifiedwhenthereisachangeofUToperators,whentransducersarechanged,whencoaxialcablesarechanged,ifapowerfailureoccurs,oriftheUTequipmentisturnedoffforanyreason.TheUTtransducerassemblyshallbearrangedsothattheultrasonicbeamsareaimedatasinglelocationinthereceptaclewallandallbeamsexitandreenterthetransducerattheirrespectivelocations.Theshearwavebeamsshallbeorientedinfouropposingdirectionsconsistingoftwoopposinglongitudinalandtwoopposingtransverseexaminations.Astraightbeamsearchunitconsistsofapiezoelectriccrystal(s)mountedtoafixturethatintroducestheultrasonicbeam(s)perpendiculartothelongitudinalaxisofthereceptacle.Eachshearwavesearchunitconsistsofapiezoelectriccrystal(s)mountedtoafixturethataresetatasufficientincidentangletointroduceshearwavesintothereceptaclebetween401and601inclusive.Asearchunitfrequencyof2.25MHzto10MHzshallbeused.Theequipmentshallbecalibratedtodetecteachartificialdefectinthestandardizationreferencereceptacle.̄  StandardizationReference(CalibrationStandard)  &4!$ Acylindricalsectionfromareceptacleoranactualreceptacleshallbeusedforastandardizationreference.Thestandardizationreferencereceptacleshallbesimilarindiameter( 10%),surfacefinish,metallurgicalandacousticalproperties,andspecificationasthereceptacletobetested.Thestandardizationreferenceshallbemachinedwithfeaturesthatsimulatedefectssuchaspits,fatiguecracks,andreducedwallthickness.ThesizeofthesefeaturesshallbesuchthatrepresenttheapplicablepassfailcriteriaidentifiedinTableAfor_requalification_Ԁofeachreceptacleorasidentifiedintheapplicablereceptaclespecifications.Theminimumwallthicknessanddefectsizesinthestandardizationreferenceshallbeconfirmedbymechanicalmeasurementsandcertifiedbyapersonwhoholdsanationallyrecognizedcertificationsuchas_ASNT_Ԁ_NDT_ԀLevelIIIcertificateinUT.ThedimensionsofeachartificialdefectinthestandardizationreferenceshallbemeasuredI  everyfiveyearstoconfirmthatthedefectsizeshavenotchanged.Theartificialdefectsshallbe 1H,0 I  I  I  I  I  I  producedbyanelectricaldischargemachine , sawing,drawing,or machining.Theartificial ^ defectsrepresentingpitsandreducedwallthicknessshallbelocatedontheinternaldiameterofthereceptacle . Thenotchesrepresentingfatiguecracksandlineardefectsshallbelocatedontheouter : andinnerdiameterofthereceptacle.Allartificialdefectsshallbelocatedsuchthatthereisnointerfacefromanyotherdefectinthestandardizationreference.    ̄_  Couplant_    Thesame_couplant_Ԁthatwasusedforstandardization(calibration)shallbeusedfortesting. K̄  UTprocedureandreportingrequirements  H  TheUTprocedureandreportingrequirementsshallbeinaccordancewithASTME797forwallthickness,ASTME213forshearwaveexaminationsandfollowing:(a)  Thesurfaceofthereceptacletobeinspectedshallbefreeofextraneousloosematerialsuch F  asscale,loosepaintanddirt.(b)  Therotationalspeedofthereceptacleunderexaminationshallnotexceedtherotational   speedusedduringstandardization.(c)  TheUTresultsshallbeevaluatedinaccordancewiththepassfailcriteriaidentifiedintable p Afor_requalification_Ԁofeachreceptacle.(d)  TheUTprogramshallbeapproved& &XXtԀbythecompetentauthority#XtX &&{#. 4 ̄   PersonnelQualificationsandResponsibilities  j  EachfacilitywheretestingistobeperformedmustbeunderthemanagerialdirectionofaSeniorReviewTechnologist(_SRT_)(a)  The_SRT_Ԁshalldefinetheoveralltestprogram,providesupervisorytrainingandtechnical  # guidancetotheUToperators,reviewandcertifytestresultsandmaintainproofofqualificationforeach"qualifiedtester".The_SRT_ԀshallholdalevelIIIcertificationinUTinaccordancewith_ASNT_Ԅ_SNT_ԄTC1AorBritishStandards_PCN_Ԁcertificationprogram.(b)  Theperson(s)performingUT,the"qualifiedtester",shallholdalevelIcertificationinUT 'H!$ inaccordancewith_ASNT_Ԅ_SNT_ԄTC1AorBritishStandards_PCN_Ԁcertificationprogram.The"qualifiedtester"mayperformasystemstartup,checkstandardization,andreviewandvalidatetestresults.(c)  Each"qualifiedtester"shallhavewrittenproceduresforconductingUTandproofof B,%) his/herqualifications.Thewrittenprocedureshallincludeanoperationmanualoftheequipment,thewrittentestprocedure,andrecordsofalltestsperformedatthefacilitywheretestingisperformed    /)- K   TableACriteriaforUltrasonicExaminationUsedXtXXXtԀDuringPeriodicInspection #XtXXXt1#XtXXXt e *wLMddd Xdd Xdd X##w,nL/ ,nL/ ,nL/ ,nL/ ,nL/ ,wL/ ,L/ +  , = s /,XXt##Metal l   ReceptacleSpecifications## <-' ( <# #Coveragearea l ofreceptaclebystraightbeamandanglebeam## <-' '  (ee <##_Rejectable_ l  crackdepthinsidewall(depthbasedon%ofwallthickness)(seenote2and3)## <-'  #11 <##_Rejectable_ l cracklengthinsidewall(multipleofwallthickness)## <-' 'ee <_Rejectable_ԀPitDimensions 2l 2##Rejectedarea l forreducedwallthickness(t)reducedwallt=anyvaluelessthatdesignmin.wallthickness1 '  D=diameteroftheReceptacle.Whicheverisgreater## J@2] # / s  /J  K #   K #   K #   K # ##_Rejectable_Ԁpit## z $ remainingwallthickness,measuredfromthebottomofthepit(seenote4) '** '##_Rejectable_Ԁpit z + diameter## &B, & /%K , /  //  o ,   o ,   o ,   o , RemainingWall 'f. 'Diameter &9/ & 0!o / /   /0 '*0 ' '*1 '#,u#N~K3,B    N&6&3,N~KN&6&6JN&&9&6JN&& &9J&    J&B      Q=h 6 w'/!!$XQ  #a#BR݌ 0!?3  0Ќ    N~K3      '*4 '#3N~K#.1?_ _#?.1^#Ԁ0.667design *5 wallthicknessbut#Ē#.1?_ _#?.1;#Ԁ0.95 Y7 designwallthickness##N~K3 'R9 '#N&6&3N~K3#N~K36&N&#3N~K#Ԁ14 *: mm>D>6.4mm##N~K3#N&6&3N~K{#N~K36&N& +U< +#3N~K"#161mm2or X? 0.009D2#ѕ#N~K3#N&6&3N~Kd# 8) @ /  / 8 5& @ /  /5#& &6&N&F#& & && &&tensilestrength aA >950_Mpa_#,#N~K3#N&6&3N~KK# *) B  * ') B  'N~K36&N&100%of aC sidewallUS.,UK.,#N&6&3N~K# *! D  * '! D  '#& &6&N&ڗ#& & && &&UK.,US.,ʘ20%ofwall aE thickness##N~K3US.,UK.,#N&6&3N~K# *) F  * ') F  '#& &6&N&/#& & && &&UK.,US.,N4timeswall aG thickness#