ASTM_D_3956_-_12_2018.pdf

Designation:D395612(Reapproved 2018)Standard Specification forMethane Thermophysical Property Tables1This standard is issued under the fixed designation D3956;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 The thermophysical property tables for methane are foruse in the calculation of the pressure-volume-temperature(PVT),thermodynamic,and transport properties of methanefor process design and operations.Three tables are provided forgaseous and liquid methane at temperatures between 90 K and600K at pressures to 30 MPa.Two tables provide properties forthe liquid and vapor phases at liquid-vapor equilibrium(satu-ration properties).The third table provides properties at se-lected T,p points for the equilibrium phase at those conditions.The tables were developed by the National Institute of Stan-dards and Technology from a Standard Reference Databaseproduct REFPROP,version 9.0.1.2 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Applicability2.1 These tables apply directly only to pure gaseous meth-ane.However,it is expected that they may find substantial usein mathematical models and tables for the thermophysicalproperties of mixtures containing methane.3.Tables3.1 Thermophysical Properties of Methane Liquid atLiquid-Vapor Equilibrium,in SI units.3.2 Thermophysical Properties of Methane Vapor at Liquid-Vapor Equilibrium,in SI units.3.3 Thermophysical Properties of Methane Along Isobars,in SI units.3.4 The tabulated properties are:=molar density(molL-1)H=molar enthalpy(Jmol-1)S=molar entropy(JK-1mol-1)Cv=constant volume molar heat capacity(JK-1mol-1)Cp=constant pressure molar heat capacity(JK-1mol-1)c=speed of sound(ms-1)=viscosity(Pas)=thermal conductivity(mWm-1K-1)3.5 These tables were produced by equations from a com-puter package,“NIST Standard Reference Database 23;Ref-erence Fluid Thermodynamic and Transport Properties Data-base(REFPROP):Version 9.0.”A wide selection of units(SIunits,engineering units,chemical units)and additional prop-erties are available with this program.24.Additional Information4.1 Reference state properties are required to calculatecertain of the thermodynamic properties(enthalpy,entropy,etc.)from an equation of state formulation.The reference stateproperties used to generate the tables in this specification are:enthalpy,H,and entropy,S,at 298.15 K and 0.101325 MPa(H=10018 J mol and S=186.266 J/(mol K).The molar massof methane is 16.043 g/mol.5.Keywords5.1 methane gas tables;natural gas;thermodynamic prop-erties of methane;transport properties of methane1This specification is under the jurisdiction of ASTM Committee D03 onGaseous Fuels and is the direct responsibility of Subcommittee D03.08 onThermophysical Properties.Current edition approved April 1,2018.Published May 2018.Originallyapproved in 1982.Last previous edition approved in 2007 as D3956 12.DOI:10.1520/D3956-12R18.2Available from Standard Reference Data,National Institute of Standards andTechnology(NIST),100 Bureau Drive,Stop 3460,Gaithersburg,MD 20899.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 TABLE 1 Thermophysical Properties of Methane Liquid at Liquid-Vapor EquilibriumTpHSCvCpcKMPamolL-1Jmol-1Jmol-1K-1Jmol-1K-1Jmol-1K-1ms-1PasmWm-1K-190.70.01170528.1418426767.79434.77554.0291538.5193.53211.18920.01380128.0338433868.56334.64154.1021526.7186.13209.64940.01761327.8668444669.72834.44554.2261508.4175.87207.20960.02223327.6988455570.87034.25854.3661489.8166.73204.71980.02777827.5288466471.99234.0854.5171471.0158.48202.161000.03437627.3578477373.09533.90854.6811452.0150.97199.561020.0421627.1858488374.17833.74154.8541432.9144.06196.921040.05127527.0108499375.24433.57955.0391413.6137.66194.241060.06186826.8358510376.29333.42155.2341394.1131.71191.531080.07409926.6578521477.32633.26655.4391374.5126.14188.791100.0881326.4788532678.34333.11555.6561354.7120.90186.021120.1041326.2978543879.34632.96655.8851334.8115.97183.241140.1222826.1138555080.33532.8256.1271314.7111.30180.441160.1427525.9288566381.31032.67756.3831294.4106.88177.621180.1657425.7408577782.27332.53756.6531274.0102.68174.791200.1914325.5518589183.22432.456.9411253.598.680171.9512