Heads up: There are no amended sections in this chapter.
The provisions contained in this appendix are not mandatory.
This appendix is used to convert from liquid to gas for cryogenic fluids.
Table G101.2 shall be used to determine the equivalent amounts of cryogenic fluids in either the liquid or gas phase.
To use Table G101.2, read horizontally across the line of interest. For example, to determine the number of cubic feet of gas contained in 1.0 gallon (3.785 L) of liquid argon, find 1.000 in the column entitled "Volume of Liquid at Normal Boiling Point." Reading across the line under the column entitled "Volume of Gas at 70°F and 1 atmosphere 14.7 psia," the value of 112.45 cubic feet (3.184 m3) is found.
If other quantities are of interest, the numbers obtained can be multiplied or divided to obtain the quantity of interest. For example, to determine the number of cubic feet of argon gas contained in a volume of 1,000 gallons (3785 L) of liquid argon at its normal boiling point, multiply 112.45 by 1,000 to obtain 112,450 cubic feet (3184 m3).

TABLE G101.2
WEIGHT AND VOLUME EQUIVALENTS FOR COMMON CRYOGENIC FLUIDS
CRYOGENIC
FLUID
WEIGHT OF LIQUID OR GAS VOLUME OF LIQUID AT NORMAL BOILING POINT VOLUME OF GAS AT NTP
Pounds Kilograms Liters Gallons Cubic feet Cubic meters
Argon 1.000 0.454 0.326 0.086 9.67 0.274
2.205 1.000 0.718 0.190 21.32 0.604
3.072 1.393 1.000 0.264 29.71 0.841
11.628 5.274 3.785 1.000 112.45 3.184
10.340 4.690 3.366 0.889 100.00 2.832
3.652 1.656 1.189 0.314 35.31 1.000
Helium 1.000 0.454 3.631 0.959 96.72 2.739
2.205 1.000 8.006 2.115 213.23 6.038
0.275 0.125 1.000 0.264 26.63 0.754
1.042 0.473 3.785 1.000 100.82 2.855
1.034 0.469 3.754 0.992 100.00 2.832
0.365 0.166 1.326 0.350 35.31 1.000
Hydrogen 1.000 0.454 6.409 1.693 191.96 5.436
2.205 1.000 14.130 3.733 423.20 11.984
0.156 0.071 1.000 0.264 29.95 0.848
0.591 0.268 3.785 1.000 113.37 3.210
0.521 0.236 3.339 0.882 100.00 2.832
0.184 0.083 1.179 0.311 35.31 1.000
Oxygen 1.000 0.454 0.397 0.105 12.00 0.342
2.205 1.000 0.876 0.231 26.62 0.754
2.517 1.142 1.000 0.264 30.39 0.861
9.527 4.321 3.785 1.000 115.05 3.250
8.281 3.756 3.290 0.869 100.00 2.832
2.924 1.327 1.162 0.307 35.31 1.000
Nitrogen 1.000 0.454 0.561 0.148 13.80 0.391
2.205 1.000 1.237 0.327 30.43 0.862
1.782 0.808 1.000 0.264 24.60 0.697
6.746 3.060 3.785 1.000 93.11 2.637
7.245 3.286 4.065 1.074 100.00 2.832
2.558 1.160 1.436 0.379 35.31 1.000
LNGa 1.000 0.454 1.052 0.278 22.968 0.650
2.205 1.000 2.320 0.613 50.646 1.434
0.951 0.431 1.000 0.264 21.812 0.618
3.600 1.633 3.785 1.000 82.62 2.340
4.356 1.976 4.580 1.210 100.00 2.832
11.501 5.217 1.616 0.427 35.31 1.000
For SI: 1 pound = 0.454 kg, 1 gallon = 3.785 L, 1 cubic foot = 0.02832 m3, °C = [(°F)-32]/1.8, 1 pound per square inch atmosphere = 6.895 kPa.
  1. The values listed for liquefied natural gas (LNG) are "typical" values. LNG is a mixture of hydrocarbon gases, and no two LNG streams have exactly the same composition.
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