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ASTM D 323 Document Information:
Title
Standard Test Method for Vapor Pressure of Petroleum Products (Reid Method)
ASTM International
Publication Date:
Dec 15, 2008
Scope:
This test method covers procedures for the determination of
vapor pressure (see Note 1) of gasoline, volatile crude oil, and
other volatile petroleum products.
Procedure A is applicable to gasoline and other petroleum
products with a vapor pressure of less than 180 kPa (26 psi).
Procedure B may also be applicable to these other materials, but
only gasoline was included in the interlaboratory test program to
determine the precision of this test method.
Procedure C is for materials with a vapor pressure of greater
than 180 kPa (26 psi).
Procedure D for aviation gasoline with a vapor pressure of
approximately 50 kPa (7 psi).
NOTE 1—Because the external atmospheric pressure is counteracted
by the atmospheric pressure initially present in the vapor chamber,
the Reid vapor pressure is an absolute pressure at 37.8°C (100°F)
in kilopascals (pounds-force per square inch). The Reid vapor
pressure differs from the true vapor pressure of the sample due to
some small sample vaporization and the presence of water vapor and
air in the confined space.
This test method is not applicable to liquefied petroleum gases
or fuels containing oxygenated compounds other than methyl t-butyl
ether (MTBE). For determination of the vapor pressure of liquefied
petroleum gases, refer to Test Method D 1267 or Test Method D 6897.
For determination of the vapor pressure of gasoline-oxygenate
blends, refer to Test Method D 4953. The precision for crude oil
has not been determined since the early 1950s (see Note 3). Test
Method D 6377 has been approved as a method for determination of
vapor pressure of crude oil. IP 481 is a test method for
determination of the air-saturated vapor pressure of crude oil.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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. Specific warning statements are
given in Sections 7 and 18, and 12.5.3, 15.5, 21.2, A1.1.2, A1.1.6,
and A2.3.
Keywords:
- crude oils
- gasoline
- Reid vapor pressure
- sparkignition
- engine fuel
- vapor pressure
- volatility
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