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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.
1.1 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 ): 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 .)
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 .
1.2 The values stated in SI units are to be regarded as standard.
22.214.171.124 Non-SI units in parentheses are given for information only.
126.96.36.199 Motor octane number and relative density are given in MON numbers and dimensionless units, respectively.
2. Documentos Citados
D1267 Test Method for Gauge 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 Determination of Hydrocarbons in Liquefied Petroleum (LP) Gases and Propane/Propene Mixtures by Gas Chromatography
D2421 Practice for Interconversion of Analysis of C5 and Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or Mass Basis