LPG quantity calculation from liquid density
ADM003GVAE1005 307
This routine always appears to converge and to give Z in the range 0.2 to 1, which
is correct for typical LPG storage conditions.
Vapor density is calculated from molecular weight, vapor temperature, vapor
space pressure and Z factor as:
The units of DENV are kg/m
3
.
Step 12
Vapor mass is calculated as the product of vapor volume and vapor density both
at tank conditions as:
Note that MV is in tonnes to match the units of liquid mass
Step 13
Total mass is the sum of liquid mass and vapor mass:
Step 14
Total weight is calculated from total mass and liquid density as:
check range of Z
70 IF Z < 0.2 OR Z > 2 THEN Z = 1
RETURN
MV = VV x DENV/1000
MT = MV + ML
Where MT = Total mass
MV = Vapor mass
ML = Liquid mass
WT = MT x (1-1.2/DENL15)/0.99985
DENV
MW P 1.013+()×
0.08314 TV 273.2+()Z××
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