Designation:D4371−06(Reapproved2012)StandardTestMethodforDeterminingtheWashabilityCharacteristicsofCoal1ThisstandardisissuedunderthefixeddesignationD4371;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONTheAmericanSocietyforTestingandMaterialshasrecognizedtheneedforastandardproceduretoconductwashabilityanalysesthatwillserveasanaidtotechnicalcommunicationamongindividualsandorganizationsthatsupply,purchase,andutilizecoal.Thistestmethodstandardizesproceduresutilizedforperformingwashabilityanalyses,thedatafromwhichcanbeusedforinterpretingpreparationplantefficiency,fordeterminingpreparationplantdesign,andfordeterminingthepotentialrecoveryandqualityofcoalreserves.1.Scope1.1Thistestmethoddescribesproceduresfordeterminingthewashabilitycharacteristicsofcoarse-coalfractionsandfine-coalfractions.Eachsamplebeingtestedcanhavemorethanonecoarse-coalsizefractionandmorethanonefine-coalsizefraction(seeAnnexA1).Eachsuchsizefractionhasanuppersizelimitandalowersizelimit,neitherofwhichoverlapswiththenextlargernorsmallersizefraction.(SeeTestMethodD4749.)1.2While,ingeneral,thistestmethodhasusefulapplicationindeterminingthewashabilitycharacteristicsoflow-rankcoals,inthestrictestsense,itisnotnecessarilythemosttechnicallycorrecttestmethodtodeterminewashabilitychar-acteristicsoflow-rankcoalsbecauseofproblemsrelativetothelossofmoisturethroughdryingduringsamplepreparationandanalysis.Methodsthataredirectlyapplicabletolow-rankcoalsaretobedeveloped.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesshowninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriorto...
