ASTM D2598-02(2007)
(Practice)Standard Practice for Calculation of Certain Physical Properties of Liquefied Petroleum (LP) Gases from Compositional Analysis
Standard Practice for Calculation of Certain Physical Properties of Liquefied Petroleum (LP) Gases from Compositional Analysis
SCOPE
1.1 This practice covers, by compositional analysis, the approximate determination of the following physical characteristics of commercial propane and special-duty propane (covered by Specification D 1835): vapor pressure, relative density, and motor octane number (MON).
1.2 This practice is not applicable to any product exceeding specifications for nonvolatile residues. (See Test Method D 2158.)
1.3 For calculating motor octane number, this practice is applicable only to mixtures containing 20 % or less of propene.
1.4 For calculated motor octane number in method, this practice is based on mixtures containing only components shown in Table 1.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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Designation:D2598 −02(Reapproved 2007)
Standard Practice for
Calculation of Certain Physical Properties of Liquefied
Petroleum (LP) Gases from Compositional Analysis
This standard is issued under the fixed designation D2598; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Lighter Hydrocarbons to Gas-Volume, Liquid-Volume, or
Mass Basis
1.1 This practice covers, by compositional analysis, the
approximate determination of the following physical charac-
3. Summary of Practice
teristics of commercial propane and special-duty propane
3.1 The composition of a sample of LP-gas is obtained by
(covered by Specification D1835): vapor pressure, relative
density, and motor octane number (MON). using Test Method D2163 or other acceptable method. From
the analysis (expressed in liquid volume percent), the vapor
1.2 This practice is not applicable to any product exceeding
pressure, relative density, and motor octane number of the
specifications for nonvolatile residues. (See Test Method
sample may be determined.
D2158.)
3.2 Conversion of a compositional analysis from mole,
1.3 For calculating motor octane number, this practice is
gas-volume, or weight basis to liquid-volume is obtained by
applicable only to mixtures containing 20 % or less of propene.
using Practice D2421 or other suitable method.
1.4 For calculated motor octane number in method, this
practice is based on mixtures containing only components
4. Significance and Use
shown in Table 1.
4.1 Vapor pressure is an important specification property of
1.5 The values stated in SI units are to be regarded as
commercial propane and special duty propane that assures
standard. The values given in parentheses are for information
adequate vaporization, safety, and compatibility with commer-
only.
cial appliances. Relative density, while not a specification
criterion, is necessary for determination of filling densities and
2. Referenced Documents
custody transfer. The motor octane number (MON) is useful in
2.1 ASTM Standards: determining the products’ suitability as a fuel for internal
D1267 Test Method for Gage Vapor Pressure of Liquefied combustion engines.
Petroleum (LP) Gases (LP-Gas Method)
D1657 Test Method for Density or Relative Density of Light 5. Calculation
Hydrocarbons by Pressure Hydrometer
5.1 Calculated LP-Gas Vapor Pressure (see Test Method
D1835 Specification for Liquefied Petroleum (LP) Gases
D1267):
D2158 Test Method for Residues in Liquefied Petroleum
5.1.1 Calculate the partial gage vapor pressure due to each
(LP) Gases
component in the mixture as follows:
D2163 Test Method for Analysis of Liquefied Petroleum
Partial gage vapor pressure 5 ~vp` 3C!/100 (1)
(LP) Gases and Propene Concentrates by Gas Chromatog-
raphy
where:
D2421 Practice for Interconversion of Analysis of C and
vp` = vapor pressure factor of specific component at 37.8°C
(100°F) (see Table 1), and
C = liquid volume percent of component in the mixture.
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
5.1.2 Add the partial gage vapor pressures due to all
Products and Lubricantsand is the direct responsibility of Subcommittee D02.H0 on
Liquefied Petroleum Gas.
components, rounding to the nearest 7kPa (1psi). The total is
Current edition approved July 1, 2007. Published September 2007. Originally
reported as the LP-gas vapor pressure of the sample, kPa gage
approv
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