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, DI, is corrected to the Real Gas
Relative Density, DR, by dividing by the compressibility factor, Z, for
gas mixture at 60 oF 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.
RDnRelative Density of component “n”
TOTAL RD Relative Density of total gas sample
CONCNnNormalized (if selected) concentration of component n, calculated
from peak analysis.
PTotal 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.
DIIdeal Gas Relative Density. See Appendix A for more information.
Zb(air) Compressibility factor of air, or 0.99959.
Zb(gas) Compressibility factor of gas mixture.
DR
DIZbair()
Zbgas()
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=
CORRDRYBTU DRYBTU
Z
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=