Describe rigorous methods to determine for natural gas and natural gas mixtures: 1) The maximum temperature above which liquid cannot be formed, regardless of pressure. 2) The temperature, at a given pressure, at which the hydrocarbon components will start to condense out of the gaseous phase. 3) The ratio of the density, in relationship to air, at a specified temperature and pressure. 4) The ratio between the volume for a given mass calculated, by the ideal gas law, and the actual volume at a specified temperature and pressure. Methods will apply to natural gas and natural gas mixtures including compounds with carbon numbers to C12 where the components and their concentrations have been determined by gas chromatography or other quantitative analytical techniques.
The natural gas industry lacks a rigorous standard for determination of cricondentherm temperature and hydrocarbon dew point for mixtures with compounds with carbon numbers greater than C6. The Practice will recommend equations of state and the natural gas compositions for which they are rigorously valid. Users can determine the appropriate equation of state for their product. Used by gas processors and quality control. Possible will be used for custody transfer of "Wet" gas mixtures.
Keywordscricondentherm; hydrocarbon dew point; HCDP; natural gas; GERG; Peng-Robinson; PR; Solve-Redlich-Kwan; SRK; Equation of State; EOS; phase diagram; relative density; compressibility; ideal gas law; carbon number
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