Standard Specification for Methane Thermophysical Property Tables
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.
ASTM D3956-23, Standard Specification for Methane Thermophysical Property Tables, establishes reliable thermophysical property data for methane. These comprehensive property tables are essential for calculating the pressure-volume-temperature (PVT), thermodynamic, and transport properties of methane, supporting the process design, simulation, and safe operation of facilities involving methane and natural gas. The standard provides tabulated properties for both gaseous and liquid methane over a broad range of temperatures (90 K to 600 K) and pressures (up to 30 MPa), including data for the equilibrium phase and saturation conditions.
Developed in collaboration with the National Institute of Standards and Technology (NIST), ASTM D3956-23 ensures data accuracy and consistency using reputable sources such as the REFPROP database, ensuring compatibility with international best practices under the WTO Technical Barriers to Trade (TBT) principles.
Thermophysical Property Tables: Three main tables covering:
Core Properties Provided:
Measurement Units: All data are provided in SI units, with additional units available via NIST REFPROP software for enhanced usability.
Reference States: The standard defines enthalpy and entropy reference states at 298.15 K and 0.101325 MPa, essential for thermodynamic calculations.
ASTM D3956-23 offers significant practical value for a variety of industries and technical domains:
Natural Gas Infrastructure: Enables design and optimization of pipelines, compressors, LNG plants, and storage facilities by providing accurate methane properties for simulations and safety analyses.
Другие стандарты ASTM
Process Engineering and Simulation: Supports the calculation of phase equilibria, energy balances, and transport phenomena in chemical and petrochemical plants handling methane or methane-rich mixtures.
Research and Development: Forms a reliable data foundation for academic and industrial research in thermodynamics, fluid mechanics, and physical chemistry related to methane.
Regulatory Compliance: Assists organizations in meeting international standardization requirements and demonstrating due diligence in process safety and performance validation.
Mixtures and Modeling: While primarily for pure methane, the tables are valuable for modeling methane-containing mixtures, aiding in the development of broader natural gas property databases.
Professionals using ASTM D3956-23 may also reference the following standards for a more holistic approach to methane and natural gas property evaluation:
Keywords: methane property tables, thermophysical properties of methane, natural gas properties, ASTM D3956-23, methane PVT data, thermodynamic properties, transport properties, NIST REFPROP