Physical Properties Of Natural Gas - I
This calculator takes in the fractional molar compositions of the natural gas (and gaseous impurities, if any) and outputs estimates of 2 physical properties of natural gas - Real gas deviation factor (Z) and Gas viscosity (μ), as well as the Specific gravity (sg) of the gas. The 2 properties are listed and plotted for the specific temperature and pressure entered as well as for pressures in the range zero to 5000 psia.
Z-factor is computed using the Hall-Yarborough direct method. This consists of 2 equations:
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where:
ppr = pseudo-reduced pressure
t = reciprocal of pseudo-reduced temperature
y = "reduced" density (an unknown).
The gas composition values are first used to determine the constants in the equations (specific gravity, critical and pseudo-reduced pressures and temperatures). The second non-linear equation is solved for "y" using the Newton-Raphson iterative technique, and the result is plugged into the first equation.
Finally, Gas viscosity is computed from the correlations by Carr et al.
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