Designation:D5515−22StandardTestMethodforDeterminationoftheSwellingPropertiesofBituminousCoalUsingaDilatometer1ThisstandardisissuedunderthefixeddesignationD5515;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONTheprincipleofthistestmethodisthatthefinalvolumeofcharobtainedattheconclusionofastandarddilatationtestisdependentonthemassofcoalinthecoalpencilandontheradiusoftheretorttube.Thistestmethodincorporatesaprocedurewhich:determinesthemassofair-driedcoalinthecoalpencil;providesameanstomeasuretheaverageretorttuberadii;andemploysameanstoreportcoalexpansiononanairdriedcoalmassbasis.OthertestmethodsusedtodeterminetheswellingpropertiesofbituminouscoalsincludetheRuhr(ISO8264)andAudibert-Arnu(ISO349)InternationalStandardOrganization(ISO)testmethods.HoweverthesetwoISOtestmethodsprovideconsistentlydifferentvaluesforpercentdilatationandpercentcontraction.PercentcontractionanddilatationvaluesobtainedusingtheAudibert-ArnutestmethodarehigherandlowerrespectivelythanthoseobtainedusingtheRuhrtestmethod.Thesedifferenceshavebeenattributedtotrimmingthelengthofthecoalpencilfromdifferentends.TheAudibert-Arnutestmethodspecifiesthatthewiderendofthecoalpencilbetrimmed,whiletheRuhrtestmethodspecifiesthatthenarrowerendofthecoalpencilbetrimmed.1.Scope1.1Thistestmethodspecifiesaprocedureforthemeasure-mentoftheswellingofbituminouscoalusingadilatometer.1.2Thetestmethodislimitedinapplicabilitytothosecoalswhichhaveafreeswellingindex≥1asdeterminedinaccor-dancewithTestMethodD720.1.3Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-p...
