ASTM D6897-03

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An American National Standard
Designation: D 6897 – 03
Standard Test Method for
Vapor Pressure of Liquefied Petroleum Gases (LPG)
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(Expansion Method)
This standard is issued under the fixed designation D 6897; 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 D 1265 Practice for Sampling Liquefied Petroleum (LP)
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Gases (Manual Method)
1.1 This test method covers the use of automatic vapor
D 1267 Test Method for Gage Vapor Pressure of Liquefied
pressure instruments to determine the vapor pressure of lique-
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Petroleum (LP) Gases (LP-Gas Method)
fied petroleum gas products at a temperature of 37.8°C, vapor
D 3700 Practice for Obtaining LPG Samples Using a Float-
to liquid ratio of 0.5:1, and pressures from 200 to 1550 kPa on
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ing Piston Cylinder
a sample volume of 3.33 mL.
D 5191 Test Method for Vapor Pressure of Petroleum Prod-
1.2 This test method is applicable to the determination of
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ucts (Mini Method)
vapor pressures of liquefied petroleum gas products at tem-
D 6299 Practice for Applying Statistical Quality Assurance
peratures from 37.8 to 70°C, vapor to liquid ratios of 0.1:1 to
Techniques to Evaluate Analytical Measurement System
4:1, and pressures up to 3500 kPa; however, the precision of
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Performance
the test method (see Section 15) has only been determined for
2.2 IP Standards:
a vapor to liquid ratio of 0.5:1, at a temperature of 37.8°C, and
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IP 181 Sampling Petroleum Gases
a pressure range from 300 to 1500 kPa.
NOTE 1—This test method is not intended to determine the true vapor 3. Terminology
pressure of LPG samples, but rather determine and report the vapor
3.1 Definitions:
pressure of LPG at the 37.8°C temperature and 0.5:1 vapor to liquid ratio
3.1.1 liquefied petroleum gases (LPG), n—narrow boiling
as the Test Method D 1267 method.
range hydrocarbon mixtures, consisting mainly of propane or
NOTE 2—This test method is not a true vapor pressure method and will
propylene, or both (Warning—Extremely flammable. Harmful
not measure the full contribution from any dissolved gases such as
nitrogen or helium if they are present. The contribution of light gases to
if inhaled), butanes and butylenes, or both; in which the
the measured vapor pressure is highly dependent on the test temperature,
concentration of hydrocarbon compounds with boiling point
type of gas, and V/L ratio of the test. A task group has been formed to
greater than 0°C is less than 5 % by liquid volume, and whose
determine or quantify the effect that the contribution of light gases have on
vapor pressure at 37.8°C (100°F) is not greater than 1550 kPa.
the measured vapor pressure of LPG sample types as a function of the test
3.2 Definitions of Terms Specific to This Standard:
temperature, type of gas, and V/L ratio of the test.
3.2.1 total pressure (P ), n—the absolute pressure (relative
tot
1.3 The values stated in SI units are to be regarded as
to vacuum) exerted by the specimen at the specified tempera-
standard.
ture and vapor-liquid ratio.
1.4 This standard does not purport to address all of the
3.2.2 true vapor pressure, n—the physical property of a
safety concerns, if any, associated with its use. It is the
given liquid which specifies the maximum pressure at which a
responsibility of the user of this standard to establish appro-
vapor phase can coexist with the liquid phase at a given
priate safety and health practices and determine the applica-
equilibrium temperature condition.
bility of regulatory limitations prior to use. For specific hazard
3.2.3 vapor pressure of LPG, n—the total pressure corrected
statements, see Appendix X2.
relative to normal barometric pressure.
3.2.4 vapor to liquid ratio, n—the ratio of the volume of the
2. Referenced Documents
vapor in equilibrium to the fill volume of liquid.
2.1 ASTM Standards:
D 1160 Test Method for Distillation of Petroleum Products
4. Summary of Test Method
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at Reduced Pressure
4.1 Employing a measuring chamber with a built-in piston,
the chamber is rinsed three times with a portion of sample,
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This test method is under the jurisdiction of ASTM Committee D02 on
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Petroleum Products and Lubricants and is the direct responsibility of Subcommittee Annual Book of ASTM Standards, Vol 05.02.
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D02.08 on Volatility. Annual Book of ASTM Standards, Vol 05.03.
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Current edition approved March 10, 2003. Published May 2003. Available from Institute of Petroleum (IP), 61 New Cavendish St., London,
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Annual Book of ASTM Standards, Vol 05.01. WIG 7AR, U.K.
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