【英文标准名称】:StandardTestMethodforJoints,Fittings,andPatchesinCoatedPipelines
【原文标准名称】:涂覆管道连接件、配件和搭接板的标准试验方法
【标准号】:ASTMG18-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.48
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:涂层;配件;连接件(活接头);材料;非金属;涂漆;涂料;管道;测试
【英文主题词】:capacitance;coating;current;dissipationfactor;fittings;immersion;joint;leakage;patches;pipeline;resistance
【摘要】:Theexposedmetalsurfacesatjoints,fittings,anddamagedareasinanotherwisecoatedpipelinewillbesubjectedtocorrosionifallowedtocomeincontactwiththesoilenvironment.Theperformanceofjointandpatchingmaterialsdesignedtofunctionasprotectivecoveringswilldependuponsuchfactorsastheabilityofthematerialtobondtoboththepipecoatingandexposedmetalsurfaces,theintegrityofthemoisturesealatlappedjoints,andthewaterabsorptioncharacteristicsofthejointmaterial.Theexistenceofsubstantialleakagecurrentthroughthecoatingjoint,patch,orfittingisreliableevidencethatthematerialhassufferedasignificantdecreaseinitsperformanceasaprotectivebarrier.Inasimilarmanner,measuredchangesinjointcapacitanceanddissipationfactorareusefulbecausetheyarerelatedtothewaterabsorptionrateofthejointmaterial.Waterpermeatinganinsulatingbarrierincreasesitscapacitanceanditsprogresscanbemeasuredthroughtheuseofasuitableimpedancebridge.1.1Thistestmethoddescribesdeterminationofthecomparativecorrosionpreventativecharacteristicsofmaterialsusedforapplicationstojoints,couplings,irregularfittings,andpatchedareasincoatedpipelines.Thetestmethodisapplicabletomaterialswhoseprincipalfunctionistoactasbarriersbetweenthepipesurfaceandsurroundingsoilenvironment.1.2Thetestmethoddescribedemploysmeasurementsofleakagecurrent,capacitance,anddissipationfactortoindicatechangesintheinsulatingeffectivenessofjointandpatchingmaterials.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.1.4ThevaluesstatedinSIunitstothreesignificantdecimalsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.
【中国标准分类号】:J15;A29
【国际标准分类号】:23_040_01
【页数】:5P.;A4
【正文语种】: