Designation:E2191/E2191M−16StandardPracticeforExaminationofGas-FilledFilament-WoundCompositePressureVesselsUsingAcousticEmission1ThisstandardisissuedunderthefixeddesignationE2191/E2191M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticeprovidesguidelinesforacousticemission(AE)examinationoffilament-woundcompositepressurevessels,forexample,thetypeusedforfueltanksinvehicleswhichusenaturalgasfuel.1.2Thispracticerequirespressurizationtoalevelequaltoorgreaterthanwhatisencounteredinnormaluse.Thetanks’pressurizationhistorymustbeknowninordertousethispractice.Pressurizationmediummaybegasorliquid.1.3Thispracticeislimitedtovesselsdesignedforlessthan275bar[4,000psi]maximumallowableworkingpressureandwatervolumelessthan1m3or1000L[35.4ft3].1.4AEmeasurementsareusedtodetectemissionsources.Othernondestructiveexamination(NDE)methodsmaybeusedtogainadditionalinsightintotheemissionsource.ProceduresforotherNDEmethodsarebeyondthescopeofthispractice.1.5Thispracticeappliestoexaminationofnewandin-service,TypeII,filament-woundcompositepressurevessels.1.6Thispracticeappliestoexaminationsconductedatambienttemperaturesabove20°C[70°F].Thispracticemaybeusedatambienttemperaturesbelow20°C[70°F]ifprovisionhasbeenmadetofilltothetank’sratedpressureat20°C[70°F].Alsothatthetesttemperaturemustnotexceedtheglasstransitiontemperatureofthematrixmaterial.1.7Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priat...
