ASTM D2598 - 12

    Standard Practice for Calculation of Certain Physical Properties of Liquefied Petroleum (LP) Gases from Compositional Analysis

    Active Standard ASTM D2598 | Developed by Subcommittee: D02.H0

    Book of Standards Volume: 05.01


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    Significance and Use

    4.1 Vapor pressure is an important specification property of commercial propane, special duty propane, propane/butane mixtures, and commercial butane that assures adequate vaporization, safety, and compatibility with commercial appliances. Relative density, while not a specification criterion, is necessary for determination of filling densities and custody transfer. The motor octane number (MON) is useful in determining the products' suitability as a fuel for internal combustion engines.

    1. Scope

    1.1 This practice covers, by compositional analysis, the approximate determination of the following physical characteristics of commercial propane, special-duty propane, commercial propane/butane mixtures, and commercial butane (covered by Specification D1835): vapor pressure, relative density, and motor octane number (MON).

    1.1.1 This practice is not applicable to any product exceeding specifications for nonvolatile residues. (See Test Method D2158.)

    1.1.2 For calculating motor octane number, this practice is applicable only to mixtures containing 20 % or less of propene.

    1.1.3 For calculated motor octane number, this practice is based on mixtures containing only components shown in Table 1.

    TABLE 1 Factors for Determining the Physical Characteristics of LP-GasesA

    Component

    Vapor Pressure Blend Factor, kPa-gage
    (PSIG) at 37.8°C (100°F)

    Relative Density at 15.6°C (60°F)

    MON Blend Value

    Methane

    17547 (2545)

    0.3

    . . .

    Ethane

    4213 (611)

    0.3563

    100.7

    Ethene (Ethylene)

    8720 (1265)

    0.37

    75.6

    Propane

    1200 (174)

    0.5072

     97.1

    Propene (Propylene)

    1466 (213)

    0.5226

     84.9

    Methylpropane (Isobutane)

    400 (58)

    0.5629

    97.6

    n-Butane

    255 (37)

    0.5842

    89.6

    t-2-Butene

    242 (35)

    0.6099

    1-Butene

    328 (48)

    0.6004

    80.8

    2-Methylpropene (Isobutylene)

    340 (49)

    0.6004

    c-2-Butene

    216 (31)

    0.6275

    83.5

    2,2-Dimethylpropane (Neopentane)

    152 (22)

    0.5961

    80.2

    Cyclopentane

    -33 (-4.7)

    0.7503

    84.9

    2-Methylbutane (Isopentane)

    40 (5.8)

    0.6251

    90.3

    n-Pentane

    6.4 (0.9)

    0.6307

    62.6

    n-Hexane

    -67 (-9.7)

    0.6641

    26.0

    A Some  constants for vapor pressure and motor octanes are empirical values to be used only in the calculation procedures described in this practice. References are located in Appendix X1.

    1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    1.2.1 Exception—Motor octane number and relative density are given in MON numbers and dimensionless units, respectively.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1267 Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method)

    D1657 Test Method for Density or Relative Density of Light Hydrocarbons by Pressure Hydrometer

    D1835 Specification for Liquefied Petroleum (LP) Gases

    D2158 Test Method for Residues in Liquefied Petroleum (LP) Gases

    D2163 Test Method for Analysis of Liquefied Petroleum (LP) Gases and Propene Concentrates by Gas Chromatography

    D2421 Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis


    ICS Code

    ICS Number Code 75.160.30 (Gaseous fuels)

    UNSPSC Code

    UNSPSC Code 15111510(Liquified petroleum gas)


    DOI: 10.1520/D2598-12

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