Designation:D4650−19StandardSpecificationforNormalButaneThermophysicalPropertyTables1ThisstandardisissuedunderthefixeddesignationD4650;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thethermophysicalpropertytablesfornormalbutaneareforuseinthecalculationofthepressure-volume-temperature(PVT),thermodynamic,andtransportpropertiesofnormalbutaneforprocessdesignandoperations.Twotablesprovidepropertiesattheconditionsofliquid-vaporequilibrium(saturationproperties),oneforliquidandoneforvapor,attemperaturesbetween135Kandthecriticalpoint,425.13K.AthirdtableprovidespropertiesatselectedT,ppointsfortheequilibriumphaseattemperaturesbetween140Kand570Katpressuresto20MPa.ThetablesweredevelopedusingtheNationalInstituteofStandardsandTechnologyStandardRef-erenceDatabaseproductREFPROP,version10.0.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.Applicability2.1Thesetablesapplydirectlyonlytopurenormalbutane.Theymayalsobeusedinmathematicalmodelsandtablesforthethermophysicalpropertiesofmixturescontainingnormalbutane.3.Tables3.1Thesetableswereproducedbyequationsfromacom-puterpackage,“NISTStandardReferenceDatabase23;Ref-erenceFluidThermodynamicandTransportPropertiesData-base(REFPROP):Version10.0.”2Awideselectionofunits(SIunits,engineeringunits,chemicalunits)andadditionalprop-ertiesareavailablewiththisprogram.3.2Thesethermophysicalpropertytablesare:3.2.1ThermophysicalPropertiesofNormalButaneLiquidatVapor-LiquidEquilibrium,inSIunits.SeeTa...
