Gas Density Calculator
Calculates natural gas density at operating conditions using real gas equations of state. Applies compressibility corrections for accurate mass flow and pipeline inventory calculations.
Operating Conditions
psig
°F
Gas Properties
-
-
Z-factor typically 0.85-0.95 for natural gas. Use 1.0 for ideal gas approximation.
Calculation Method
Real gas equation recommended for high pressure applications (>100 psig)
Results
Gas Density
-
lb/ft³
Density (kg/m³)-
Specific Volume-
Molecular Weight-
Method Used-
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Formula
ρ = (P × MW) / (Z × R × T)
ρ = Gas density (lb/ft³)
P = Absolute pressure (psia)
MW = Molecular weight (lb/lbmol)
Z = Compressibility factor
R = Gas constant (10.73 psia·ft³/lbmol·°R)
T = Absolute temperature (°R)
Standards & References
AGA Report No. 8 Compressibility Factors of Natural Gas
GPSA Engineering Data Book Gas Properties and Calculations
ISO 12213 Natural Gas - Calculation of Compression Factor
Important Notes
Gas gravity is ratio of gas molecular weight to air (28.97)
Z-factor accounts for non-ideal gas behavior at high pressure
Ideal gas law acceptable for low pressure (<100 psig)
Real gas equation required for accurate high pressure calculations