Hydraulic Analysis

Gas Compressibility Factor

This web application determine Gas Compressibility factor based on California Natural Gas Association (CNGA) Method and Standing-Katz Method.

Gas Data

 
kPag
°C

CNGA Method

Z=(1+(Pavg∗344400∗(10)1.785∗GTf3.825))−1 \displaystyle \displaystyle Z = {\left( 1 + \left(\frac{P_{avg}*344400*\left(10\right)^{1.785*G}}{T_f^{3.825}}\right)\right)}^{-1}

where, Pavg is Gas Pressure in psig, Tf is Gas Temperature in °R and G is Gas Gravity.

Gas Compressibility Factor at Flowing Temperature, Z - 0.775

Standing-Katz Method

Pseudo-Critical Temperature, Tpc °K 213.8
Pseudo-Reduced Temperature, Tpr - 1.395
Pseudo-Critical Pressure, Ppc kPaa 4545.03
Pseudo-Reduced Pressure, Ppr - 1.783
Reduced Density, ρr - 0.462
Gas Compressibility Factor at the Flowing Temperature, Z - 0.747

Reference

  1. Transmissions Pipeline Calculations and Simulations Manual by E. Shashi Menon, 2015 (Link)
  2. Gas Pipeline Hydraulics - CED Engineering