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User Manual MON20/20 Software for Gas Chromatographs
3-9000-745 OCTOBER 2010
B-8
where
• Real (corrected) Gas Relative Density
The Ideal Gas Relative Density, D
I
, is corrected to the Real Gas
Relative Density, D
R
, by dividing by the compressibility factor, Z, for
gas mixture at 60
o
F and one atmosphere pressure and multiplying by
the compressibility factor of air at the same conditions:
where
• Compressibility Factor Dry BTU
Compressibility equations use calculations from the American Gas
Association’s Compressibility Factors of Natural Gas and Other
Related Hydrocarbon Gases: AGA Report #8.
RD
n
Relative Density of component “n”
TOTAL RD Relative Density of total gas sample
CONCN
n
Normalized (if selected) concentration of component n, calculated
from peak analysis.
P Total number of components to be used in calculation of total BTU/
CF.
100 Removed the 100 factored into the calculation of the concentration
earlier in the analysis.
D
I
Ideal Gas Relative Density. See Appendix A for more information.
Z
b(air)
Compressibility factor of air, or 0.99959.
Z
b(gas)
Compressibility factor of gas mixture.
D
R
D
I
Z
bair()
Z
bgas()
---------------------
=
CORRDRYBTU
DRYBTU
Z
------------------------
=