Calculation methods of compressibility factor for natural gas

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Calculation methods of compressibility factor

• AGA 8 Detailed Characterization Method - Required parameters are:

1. Pressure
2. Temperature
3. Gas mixture components fractions or percentages

Reference: American Gas Association Report No. 8, "Compressibility Factor of Natural Gas and Other Related Hydrocarbon Gases", Second Edition, November 1992, 2nd printing July 1994. Detail Characterization Method.

• AGA 8 Gross Characterization Methods
  1. Method 1 - Required parameters are:

1. Pressure
2. Temperature
3. Gross caloric (heating) value
4. Relative density (specific gravity)
5. Fraction or percentage of carbon dioxide

Reference: American Gas Association Report No. 8, "Compressibility Factor of Natural Gas and Other Related Hydrocarbon Gases", Second Edition, November 1992, 2nd printing July 1994. Gross Characterization Method-1.

1. Method 2

1. Pressure
2. Temperature
3. Relative density (specific gravity)
4. Fraction or percentage of carbon dioxide and nitrogen

Reference: American Gas Association Report No. 8, "Compressibility Factor of Natural Gas and Other Related Hydrocarbon Gases", Second Edition, November 1992, 2nd printing July 1994. Gross Characterization Method-2.

• NX19 mod. - Required parameters are:

1. Pressure
2. Temperature
3. Relative density (specific gravity)
4. Fraction or percentage of carbon dioxide or nitrogen

Reference: VDI/VDE 2040, part 2, 1987. Calculation principals for measurement of fluid flow using orifice plates, nozzles and ventury tubes. Equation and formulas.

• GERG-91 mod. - Required parameters are:

1. Pressure
2. Temperature
3. Relative density (specific gravity)
4. Fraction or percentage of carbon dioxide or nitrogen

Reference: ICO/TC 193 SCI No. 63. Natural gas - calculation of compression factor. Part 3: Calculation using measured physical properties.

• GPSA - Required parameters are:

1. Pressure
2. Temperature
3. Relative density (specific gravity)

Reference: Gas Processors Suppliers Association, Engineering data book, 1998