Designation:G189−07(Reapproved2013)StandardGuideforLaboratorySimulationofCorrosionUnderInsulation1ThisstandardisissuedunderthefixeddesignationG189;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversthesimulationofcorrosionunderinsulation(CUI),includingbothgeneralandlocalizedattack,oninsulatedspecimenscutfrompipesectionsexposedtoacorrosiveenvironmentusuallyatelevatedtemperature.ItdescribesaCUIexposureapparatus(hereinafterreferredtoasaCUI-Cell),preparationofspecimens,simulationproceduresforisothermalorcyclictemperature,orboth,andwet/dryconditions,whichareparametersthatneedtobemonitoredduringthesimulationandtheclassificationofsimulationtype.1.2Theapplicationofthisguideisbroadandcanincorpo-ratearangeofmaterials,environmentsandconditionsthatarebeyondthescopeofasingletestmethod.Theapparatusandprocedurescontainedhereinareprincipallydirectedatestab-lishingacceptableproceduresforCUIsimulationforthepurposesofevaluatingthecorrosivityofCUIenvironmentsoncarbonandlowalloypipesteels,andmaypossiblybeapplicabletoothermaterialsaswell.However,thesameorsimilarprocedurescanalsobeutilizedfortheevaluationof(1)CUIonothermetalsoralloys,(2)anti-corrosivetreatmentsonmetalsurfaces,and(3)thepotentialcontributionofthermalinsulationanditsconstituentsonCUI.Theonlyrequirementsarethattheycanbemachined,formedorincorporatedintotheCUI-Cellpipeconfigurationasdescribedherein.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatoryli...
