LNG Compressibility Factor & HREAL

Inputs

Input	Description
Component Data	Mole Fraction Attribute (DataTable) (Xind)
Summation Factor	Column from Component Table (bi)

Calculations

Example

Component	Xind	bi	Xind * bi
Methane (C1)	83.02%	0.01160	0.00963
Ethane (C2)	7.45%	0.02380	0.00177
Propane (C3)	4.39%	0.03470	0.00152
Iso-Butane (iC4)	0.83%	0.04410	0.00037
n-Butane (nC4)	1.08%	0.04700	0.00051
Iso-Pentane (iC5)	0.31%	0.05760	0.00018
n-Pentane (nC5)	0.25%	0.06060	0.00015
n-Hexane (C6+)	0.30	0.07760	0.00023
Carbon Dioxide (CO2)	2.02%	0.01950	0.00039
Hydrogen Sulfide (H2S)	0.00%	0.02390	0.00000
Nitrogen (N2)	0.32%	0.00442	0.00001
Oxygen (O2)	0.03%	0.00720	0.00000
Water (H2O)	0.00%	0.06510	0.00000
TOTAL			0.01476

Z = 1 - 14.73 * (0.01476 * 0.01476) = 0.996790958

Ideal Heating Value (HIDEAL) is then divided by compressibility factor (Z) to obtain Real Heating Value (HREAL).

HREAL\= HIDEAL / Z = 1179.7173/0.996790958 = 1183.515251

Gas Meter Energy (REAL) = HREAL * Volume = 1,585,199,143 MMBTU