Designation:D7177/D7177M−21StandardSpecificationforAirChannelEvaluationofPolyvinylChloride(PVC)DualTrackSeamedGeomembranes1ThisstandardisissuedunderthefixeddesignationD7177/D7177M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThisspecificationcoversanondestructiveevaluationofthestrengthandcontinuityofparallelPVCgeomembraneseamsseparatedbyanunweldedairchannel.Theunweldedairchannelbetweenthetwodistinctseamedregionsissealedandinflatedwithairtoapredeterminedpressure.Longlengthsofseamcanbeevaluatedbythisspecificationmorequicklythanbyothercommonnondestructivetests.1.2Thisspecificationcanbeusedasasubstitutefordestructivetestingorusedinconjunctionwithdestructivetesting.1.3ThisspecificationcoversPVCsheet0.760mm[0.030in.]andthicker.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4439TerminologyforGeosynthetics3.Terminology3.1Definitions:3.1.1dualseam,n—ageomembraneseamwithtwoparallelweldedzonesseparatedbyanunweldedairspace.3.1.1.1Discussion—Thedualseami...
