Evaluation of State Equations of Natural Gas in Pipeline Transportation

2012 ◽  
Vol 463-464 ◽  
pp. 936-939 ◽  
Author(s):  
Hong Yu Ren ◽  
Chang Jun Li ◽  
Guo Xie
Keyword(s):  
Numerical Methods ◽  
Natural Gas ◽  
Compressibility Factor ◽  
Computer Programs ◽  
Pipeline Transportation ◽  
Basic Form ◽  
State Equations

In current study, Sarem, CNGA, Peng-Robinson, AGA8-92DC, BWRS state equations have been researched by analyzing the basic form and developing the numerical methods of compressibility factor. An attempt has been made to develop corresponding computer programs to calculate compressibility factor with these five state equations. The computed results have been compared with Standing-Katz chart. The results show the similar trends and good agreements

Technique and results of experimental determination of the compressibility factor of the natural gas

2021 ◽  
pp. 35-40
Author(s):  
Denis Y. Kutovoy ◽  
Igor A. Yatsenko ◽  
Vladimir B. Yavkin ◽  
Aydar N. Mukhametov ◽  
Petr V. Lovtsov ◽  
...  
Keyword(s):  
Natural Gas ◽  
Equations Of State ◽  
Compressibility Factor ◽  
High Accuracy ◽  
State Equations ◽  
Actual Problem ◽  
Temperature Range ◽  
Relative Value ◽  
Compressibility Coefficient

The actual problem of the possibility of using the equations of state for the gas phase of natural gas at temperatures below 250 K is considered. To solve it, the compressibility coefficients of natural gas obtained experimentally with high accuracy are required. The technique was developed and experimental study was carried out of compressibility factor aiming expanding temperature range of the state equations GERG-2004 and AGA8-DC92. The proposed technique is based on the fact that to assess the applicability of the equation of state, it is sufficient to obtain the relative value of the compressibility coefficient and not to determine its absolute value. The technique does not require complex equipment and provides high accuracy. The technique was tested on nitrogen, argon, air and methane. Uncertainty of determination of the compressibility factor is not greater than 0.1 %. For two different compositions of natural gas, obtained experimental data were demonstrated that the equations of state GERG-2004 and AGA8-92DC provide uncertainty of the calculation of the compressibility coefficient within 0.1 % in the temperature range from 220 K to 250 K and pressure below 5 MPa.

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