ASTM D1837-02
(Test Method)Standard Test Method for Volatility of Liquefied Petroleum (LP) Gases
Standard Test Method for Volatility of Liquefied Petroleum (LP) Gases
SCOPE
1.1 This test method is a measure of the relative purity of the various types of liquefied petroleum (LP) gases and helps to ensure suitable volatility performance. The test results, when properly related to vapor pressure and density of the product, can be used to indicate the presence of butane and heavier components in propane type LP-gas, and pentane and heavier components in propane-butane and butane type fuels. The presence of hydrocarbon compounds less volatile than those of which the LP-gas is primarily composed is indicated by an increase in the 95 % evaporated temperature.
1.2 When the type and concentration of higher boiling components is required, chromatographic analysis should be used.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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An American National Standard
Designation: D 1837 – 02
Standard Test Method for
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Volatility of Liquefied Petroleum (LP) Gases
This standard is issued under the fixed designation D 1837; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope remains, for barometric pressure and thermometer ice point
error, and report as the 95 % evaporation temperature.
1.1 This test method is a measure of the relative purity of
the various types of liquefied petroleum (LP) gases and helps
4. Significance and Use
to ensure suitable volatility performance. The test results, when
4.1 Volatility, expressed in terms of the 95 % evaporated
properly related to vapor pressure and density of the product,
temperature of the product, is a measure of the amount of least
can be used to indicate the presence of butane and heavier
volatile components present in the product. Coupled with a
components in propane type LP-gas, and pentane and heavier
vapor pressure limit, it serves to ensure essentially single-
components in propane-butane and butane type fuels. The
component products in the cases of commercial grades of
presence of hydrocarbon compounds less volatile than those of
propane and butane. When volatility is coupled with a vapor
which the LP-gas is primarily composed is indicated by an
pressure limit which has been related to density, as in the case
increase in the 95 % evaporated temperature.
of the commercial PB-mixture, the combination serves to
1.2 When the type and concentration of higher boiling
assure essentially two component mixtures for such fuels.
components is required, chromatographic analysis should be
When coupled with a proper vapor pressure limit, this mea-
used.
surement serves to assure that special-duty propane products
1.3 The values stated in SI units are to be regarded as the
will be composed chiefly of propane and propylene and that
standard. The values given in parentheses are for information
propane will be the major constituent.
only.
1.4 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Weathering Tube—A centrifuge tube, cone-shaped, con-
responsibility of the user of this standard to establish appro-
forming to the dimensions given in Fig. 1 and made of
priate safety and health practices and determine the applica-
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thoroughly annealed heat-resistant glass. The shape of the
bility of regulatory limitations prior to use.
lower tip of the tube is especially important. The taper shall be
2. Referenced Documents uniform and the bottom shall be rounded as shown in Fig. 1.
The tubes shall comply in wall thickness to ASTM centrifuge
2.1 ASTM Standards:
tube requirements (Note 1). The graduation tolerances are
D 96 Test Methods for Water and Sediment in Crude Oil by
2 given in Table 1.
Centrifuge Method (Field Procedure)
D 1796 Test Method for Water and Sediment in Fuel Oils by
NOTE 1—Requirements for centrifuge tubes appear in Test Methods
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the Centrifuge Method (Laboratory Procedure) D 96 and D 1796.
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E 1 Specification for ASTM Thermometers
5.2 Tube Support—Means shall be provided for supporting
the weathering tube by its neck in a vertical position.
3. Summary of Test Method
5.3 Water Bath (for use in tests on butane and propane-
3.1 Refrigerate the sample by means of a cooling coil and
butane mixture types of liquefied petroleum gas only). A
collect 100 mL of liquid in a weathering tube. Allow to
shallow container filled with clean water having a maintained
evaporate (“weather”) at ambient pressure under specified
temperature ranging from 15 to 21°C (60 to 70°F) and a depth
conditions that approximate a single plate distillation. Correct
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of 38 mm (1 ⁄2 in.).
the observed temperature, when 5 mL of liquid test portion
5.4 Thermometer—ASTM Armored Weathering Test Ther-
mometer having a range from −50 to 5°C (−58 to 41°F) and
conforming to the requirements for Thermometer 99C−92
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This test method is under the jurisdiction of ASTM Committee D02 on
(99F−86) as prescribed in Specification E 1. Do not remove the
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
armor from the thermometer.
D02.H on Liquified Petroleum Gas.
5.5 Sampling Precooling Equipment:
Current edition approved Jan. 10, 2002. Published March 2002. Originally
published as 2D 1837 – 61 T. Last previous edition D 1837 – 01.
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Annual Book of ASTM Standards, Vol 05.01.
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Annual Book of ASTM Standards, Vol 14.03. Borosilicate glass has been found satisfactory for this purpose.
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