Racket compressibility factor
(ZRA), can be calculated as:
For the compressibility factor
, Z = [p/([rho]RT)], this becomes
In summary, the SRK equation has the same common failing of other cubic EoS, namely the inability, when subject to the classical constraints conditions on the critical isotherm, to provide simultaneously acceptable values for the second virial coefficient, the critical compressibility factor
A numerical friendly form of Redlich-Kwong cubic equation  of state in compressibility factor
, Z, is used to model nonideal gas behavior.
Design parameters describe a compressibility factor
of 10 to 40%, tensile strength of 1500 to 4000 psi, and compressive strength of 10,000 to 60,000 psi.
Adding water vapor to calculations has an impact that permeates into various subsequent values, such as relative density, compressibility factor
calculations, volume calculation results, and heating value calculation results.
Therefore, the effects of inlet temperature, gas molecular weight and compressibility factor
are not required to be considered in the controlling system.
The correlation of the compressibility factor
as a function of temperature and pressure was the basis to obtain an equation for dry air specific volume.
These factors are variation of gas compressibility factor
along the pipeline, height differences between locations of pipeline sections, intermediate gas tapping from the pipeline, additional pressure losses at pipeline fittings and non-stationary regime of gas flow in the pipeline.
But the most common one that has been used by several authors is to introduce the general form of the compressibility factor
Z in the following form (Kretschmer and Wiebe, 1954; Anderko, 1989a, 1989b, 1990, 1991, 1992; Anderko and Prausnitz, 1994; Shinta and Firoozabadi, 1995; Cho et al.
where the compressibility factor
[gamma] = -[1/V]([[partial derivative]V]/[[partial derivative]P])[.
As an example, the equation of the relation between compressibility and input parameters is as complex as below, the effect of uncertainty in line pressure, line temperature and gas composition on compressibility factor
can be estimated using Monte Carlo method: