ASTM D3956-23

Standard Specification for Methane Thermophysical Property Tables

ABSTRACT
This specification presents the thermophysical property tables for methane, which are used in the calculation of the pressure-volume-temperature (PVT), thermodynamic, and transport properties of methane for process design and operations. Tables are provided for gaseous and liquid methane at specified temperature and pressure ranges. One table provides properties at the conditions of liquid-vapor equilibrium (saturation properties). The other table provides properties at selected T, p points for the equilibrium phase at those conditions. These tables apply directly only to pure gaseous methane, but are expected to be substantially useful in mathematical models and tables for the thermophysical properties of mixtures containing methane.
SCOPE
1.1 The thermophysical property tables for methane are for use in the calculation of the pressure-volume-temperature (PVT), thermodynamic, and transport properties of methane for process design and operations. Three tables are provided for gaseous and liquid methane at temperatures between 90 K and 600 K at pressures to 30 MPa. Two tables provide properties for the liquid and vapor phases at liquid-vapor equilibrium (saturation properties). The third table provides properties at selected T, p points for the equilibrium phase at those conditions. The tables were developed by the National Institute of Standards and Technology from a Standard Reference Database product REFPROP, version 10.02.  
1.2 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Oct-2023
• ICS: 75.160.30 - Gaseous fuels
• Technical Committee: D03 - Gaseous Fuels
• Drafting Committee: D03.08 - Thermophysical Properties

Relations

• Replaces: ASTM D3956-12(2018) - Standard Specification for Methane Thermophysical Property Tables
• Effective Date: 01-Nov-2023

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3956 − 23
Standard Specification for
1
Methane Thermophysical Property Tables
This standard is issued under the fixed designation D3956; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Terminology
4.1 Definitions:
1.1 The thermophysical property tables for methane are for
4.1.1 For definitions of general terms used in D03 Gaseous
use in the calculation of the pressure-volume-temperature
Fuels standards, refer to Terminology D4150.
(PVT), thermodynamic, and transport properties of methane
4.2 Abbreviations:
for process design and operations. Three tables are provided for
4.2.1 LNG—Liquefied Natural Gas
gaseous and liquid methane at temperatures between 90 K and
600 K at pressures to 30 MPa. Two tables provide properties
5. Tables
for the liquid and vapor phases at liquid-vapor equilibrium
5.1 Thermophysical Properties of Methane Liquid at
(saturation properties). The third table provides properties at
Liquid-Vapor Equilibrium, in SI units.
selected T, p points for the equilibrium phase at those condi-
tions. The tables were developed by the National Institute of
5.2 Thermophysical Properties of Methane Vapor at Liquid-
Standards and Technology from a Standard Reference Data-
Vapor Equilibrium, in SI units.
2
base product REFPROP, version 10.0 .
5.3 Thermophysical Properties of Methane Along Isobars,
1.2 This international standard was developed in accor-
in SI units.The tabulated properties are:
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
-1
ρ = molar density (mol·L )
Development of International Standards, Guides and Recom-
-1
H = molar enthalpy (J·mol )
mendations issued by the World Trade Organization Technical
-1 -1
S = molar entropy (J·K ·mol )
Barriers to Trade (TBT) Committee.
-1 -1
C = constant volume molar heat capacity (J·K ·mol )
v
-1 -1
C = constant pressure molar heat capacity (J·K ·mol )
p
2. Referenced Documents
-1
c = speed of sound (m·s )
3
2.1 ASTM Standards: η = viscosity (μPa·s)
-1 -1
λ = thermal conductivity (mW·m ·K )
D4150 Terminology Relating to Gaseous Fuels
These tables were produced by equations from a computer
3. Applicability
package, “NIST Standard Reference Database 23; Reference
Fluid Thermodynamic and Transport Properties Database
3.1 These tables apply directly only to pure gaseous meth-
(REFPROP): Version 10.0.” A wide selection of units (SI units,
ane. However, it is expected that they may find substantial use
engineering units, chemical units) and additional properties are
in mathematical models and tables for the thermophysical
4
available with this program.
properties of mixtures containing methane.
6. Additional Information
6.1 The Reference States for enthalpy and entropy have
1
This specification is under the jurisdiction of ASTM Committee D03 on
been updated in this version of the standard.
Gaseous Fuels and is the direct responsibility of Subcommittee D03.08 on
Reference state properties are required to calculate certain of
Thermophysical Properties.
Current edition approved Nov. 1, 2023. Published December 2023. Originally the thermodynamic properties (enthalpy, entropy, etc.) from an
approved in 1982. Last previous edition approved in 2018 as D3956 – 12 (2018).
equation of state formulation. The reference state properties
DOI: 10.1520/D3956-23.
used to generate the tables in this specification are: enthalpy, H,
2
Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard
and entropy, S, at 298.15 K and 0.101325 MPa (H = 10018
Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-
REFPROP, Version 10.0, National Institute of Standards and Technology, Standard J ⁄mol and S = 186.266 J/(mol K)). The molar mass of methane
Reference Data Program, Gaithersburg, 2018.
is 16.043 g/mol.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4
Standards volume information, refer to the standard’s Document Summary page on Available from Standard Reference Data, National Institute of Standards and
the ASTM website. Technology (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 States
1

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D3956 − 23
7. Keywords
7.1 methane g
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D3956 − 12 (Reapproved 2018) D3956 − 23
Standard Specification for
1
Methane Thermophysical Property Tables
This standard is issued under the fixed designation D3956; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 The thermophysical property tables for methane are for use in the calculation of the pressure-volume-temperature (PVT),
thermodynamic, and transport properties of methane for process design and operations. Three tables are provided for gaseous and
liquid methane at temperatures between 90 K and 600K600 K at pressures to 30 MPa. Two tables provide properties for the liquid
and vapor phases at liquid-vapor equilibrium (saturation properties). The third table provides properties at selected T,p points for
the equilibrium phase at those conditions. The tables were developed by the National Institute of Standards and Technology from
2
a Standard Reference Database product REFPROP, version 9.0.10.0 .
1.2 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
3
2.1 ASTM Standards:
D4150 Terminology Relating to Gaseous Fuels
3. Applicability
3.1 These tables apply directly only to pure gaseous methane. However, it is expected that they may find substantial use in
mathematical models and tables for the thermophysical properties of mixtures containing methane.
4. Terminology
4.1 Definitions:
4.1.1 For definitions of general terms used in D03 Gaseous Fuels standards, refer to Terminology D4150.
4.2 Abbreviations:
4.2.1 LNG—Liquefied Natural Gas
5. Tables
5.1 Thermophysical Properties of Methane Liquid at Liquid-Vapor Equilibrium, in SI units.
1
This specification is under the jurisdiction of ASTM Committee D03 on Gaseous Fuels and is the direct responsibility of Subcommittee D03.08 on Thermophysical
Properties.
Current edition approved April 1, 2018Nov. 1, 2023. Published May 2018December 2023. Originally approved in 1982. Last previous edition approved in 20072018 as
D3956 – 12.D3956 – 12 (2018). DOI: 10.1520/D3956-12R18.10.1520/D3956-23.
2
Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP,
Version 10.0, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, 2018.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3956 − 23
5.2 Thermophysical Properties of Methane Vapor at Liquid-Vapor Equilibrium, in SI units.
3.3 Thermophysical Properties of Methane Along Isobars, in SI units.
5.3 Thermophysical Properties of Methane Along Isobars, The tabulated properties are:in SI units.The tabulated properties are:
-1
ρ = molar density (mol·L )
-1
H = molar enthalpy (J·mol )
-1 -1
S = molar entropy (J·K ·mol )
-1 -1
C = constant volume molar heat capacity (J·K ·mol )
v
-1 -1
C = constant pressure molar heat capacity (J·K ·mol )
p
-1
c = speed of sound (m·s )
η = viscosity (μPa·s)
-1 -1
λ = thermal conductivity (mW·m ·K )
These tables were produced by equations from a computer package, “NIST Standard Reference Database 23; Reference Fluid
Thermodynamic and Transport Properties Database (REFPROP): Version 10.0.” A wide selection of units (SI units, engineering
4
units, chemical units) and additional properties are available with this program.
3.5 These tables were produced by equations from a computer package, “NIST Standard Reference Database 23; Reference Fluid
Thermodynamic and Transport Properties Database (REFPROP): Version 9.0.” A wide selection of units (SI units, engineering
2
units, chemical units) and additional properties are available with this program.
6. Additional Information
6.1 The Reference States for enthalpy a
...