Designation:D4579−00(Reapproved2017)StandardPracticeforHandlinganAcidDegreaserorStill1ThisstandardisissuedunderthefixeddesignationD4579;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheproceduresrequiredforrecog-nizingandhandlinganacidvapordegreaserorstill.1.2Ifthedegreaser(s)isequippedwithastill,followtheprocedureinthispracticeforalloftheequipment.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2110TestMethodforpHofWaterExtractionsofHaloge-natedOrganicSolventsandTheirAdmixturesD2942TestMethodforTotalAcidAcceptanceofHaloge-natedOrganicSolvents(NonrefluxMethods)D3698PracticeforSolventVaporDegreasingOperationsD4276PracticeforConfinedAreaEntry2.2FederalRegulations:329CFR1910.146,Permit-RequiredConfinedSpaces3.Terminology3.1Definitions:3.1.1aciddegreaser,n—anaciddegreaseristheresultofthedecompositionofthedegreasingsolventtoacidproducts.4.SignificanceandUse4.1Thispracticedescribesthesymptomsandcausesofanaciddegreaseraswellasmethodsforcorrectingtheproblem.4.2Thispracticeisintendedasareferenceforusebypersonsresponsiblefortheoperationormaintenanceofvapordegreasersorstills.44.3Thispracticeisnotintendedtocovereverypossiblesituation.5.SymptomsofanAcidDegreaser/Still5.1Anacidconditioninavapordegreasermayberecog-niz...
