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  • APPENDIXG
    CRYOGENIC FLUIDS—WEIGHT AND VOLUME EQUIVALENTS

    This appendix is for information purposes and is not intended for adoption.

    SECTIONG101
    GENERAL

    G101.1 Scope.

    This appendix is used to convert from liquid to gas for cryogenic fluids.

    G101.2 Conversion.

    Table G101.2 shall be used to determine the equivalent amounts of cryogenic fluids in either the liquid or gas phase.

    TABLE G101.2

    WEIGHT AND VOLUME EQUIVALENTS FOR COMMON CRYOGENIC FLUIDS

    CRYOGENIC FLUIDWEIGHT OF LIQUID OR GASVOLUME OF LIQUID AT NORMAL BOILING POINTVOLUME OF GAS AT NTP
    PoundsKilogramsLitersGallonsCubic feetCubic meters
    Argon1.0000.4540.3260.0869.670.274
    2.2051.0000.7180.19021.320.604
    3.0721.3931.0000.26429.710.841
    11.6285.2743.7851.000112.453.184
    10.3404.6903.3660.889100.002.832
    3.6521.6561.1890.31435.311.000
    Helium1.0000.4543.6310.95996.722.739
    2.2051.0008.0062.115213.236.038
    0.2750.1251.0000.26426.630.754
    1.0420.4733.7851.000100.822.855
    1.0340.4693.7540.992100.002.832
    0.3650.1661.3260.35035.311.000
    Hydrogen1.0000.4546.4091.693191.965.436
    2.2051.00014.1303.733423.2011.984
    0.1560.0711.0000.26429.950.848
    0.5910.2683.7851.000113.373.210
    0.5210.2363.3390.882100.002.832
    0.1840.0831.1790.31135.311.000
    Oxygen1.0000.4540.3970.10512.000.342
    2.2051.0000.8760.23126.620.754
    2.5171.1421.0000.26430.390.861
    9.5274.3213.7851.000115.053.250
    8.2813.7563.2900.869100.002.832
    2.9241.3271.1620.30735.311.000
    Nitrogen1.0000.4540.5610.14813.800.391
    2.2051.0001.2370.32730.430.862
    1.7820.8081.0000.26424.600.697
    6.7463.0603.7851.00093.112.637
    7.2453.2864.0651.074100.002.832
    2.5581.1601.4360.37935.311.000
    LNGa1.0000.4541.0520.27822.9680.650
    2.2051.0002.3200.61350.6461.434
    0.9510.4311.0000.26421.8120.618
    3.6001.6333.7851.00082.622.340
    4.3561.9764.5801.210100.002.832
    11.5015.2171.6160.42735.311.000

    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. a.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.

    G101.2.1 Use of the table.

    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 NTP” (70°F and 1 atmosphere/14.7 psia), the value of 112.45 cubic feet (3.184 m3) is found.

    G101.2.2 Other quantities.

    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).