ASTM D6378-03
(Test Method)Standard Test Method for Determination of Vapor Pressure (VPx) of Petroleum Products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method)
Standard Test Method for Determination of Vapor Pressure (VP<sub>x</sub>) of Petroleum Products, Hydrocarbons, and Hydrocarbon-Oxygenate Mixtures (Triple Expansion Method)
SCOPE
1.1 This test method covers the use of automated vapor pressure instruments to determine the vapor pressure exerted in vacuum by volatile, liquid petroleum products, hydrocarbons, and hydrocarbon-oxygenate mixtures. This test method is suitable for testing samples with boiling points above 0°C (32°F) that exert a vapor pressure between 7 and 150 kPa (1.0 and 21psi) at 37.8°C (100°F) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 1 to 10 mL.
Note 1—The test method is suitable for the determination of the vapor pressure of volatile, liquid petroleum products at temperatures from 0 to 100 C at vapor to liquid ratios of 4:1 to 1.1 (X = 4 to 1) and pressures up to 500 kPa (70 psi), but the precision statement (see Section ) may not be applicable.
1.2 The VPX determined by this test method at a vapor-liquid ratio of 4:1 (X = 4) of gasoline and gasoline-oxygenate blends at 37.8°C can be correlated to the dry vapor pressure equivalent (DVPE) value determined by Test Method D 5191 (see Section 15.2).
1.3 The values stated in SI units are regarded as standard. The inch-pound units given in parentheses are provided 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:D6378–03
Standard Test Method for
Determination of Vapor Pressure (VP ) of Petroleum
X
Products, Hydrocarbons, and Hydrocarbon-Oxygenate
1
Mixtures (Triple Expansion Method)
This standard is issued under the fixed designation D 6378; 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 323 Test Method for Vapor Pressure of Petroleum Prod-
ucts (Reid Method)
1.1 This test method covers the use of automated vapor
D 2892 Test Method for Distillation of Crude Petroleum
pressureinstrumentstodeterminethevaporpressureexertedin
(15-Theoretical Plate Column)
vacuum by volatile, liquid petroleum products, hydrocarbons,
D 4057 Practice for Manual Sampling of Petroleum and
and hydrocarbon-oxygenate mixtures. This test method is
Petroleum Products
suitable for testing samples with boiling points above 0°C
D 4177 Practice for Automatic Sampling of Petroleum and
(32°F) that exert a vapor pressure between 7 and 150 kPa (1.0
Petroleum Products
and 21psi) at 37.8°C (100°F) at a vapor-to-liquid ratio of 4:1.
D 4953 Test Method for Vapor Pressure of Gasoline and
Measurements are made on liquid sample sizes in the range
Gasoline-Oxygenate Blends (Dry Method)
from1to10mL.
D 5191 Test Method for Vapor Pressure of Petroleum Prod-
NOTE 1—The test method is suitable for the determination of the vapor
ucts (Mini Method)
pressure of volatile, liquid petroleum products at temperatures from 0 to
D 5842 Practice for Sampling and Handling of Fuels for
100 °C at vapor to liquid ratios of 4:1 to 1.1 (X=4to1)and pressures up
Volatility Measurements
to 500 kPa (70 psi), but the precision statement (see Section 15) may not
D 5854 Practice for Mixing and Handling of Liquid
be applicable.
Samples of Petroleum and Petroleum Products
1.2 The VP determined by this test method at a vapor-
X
liquid ratio of 4:1 (X = 4) of gasoline and gasoline–oxygenate
3. Terminology
blends at 37.8°C can be correlated to the dry vapor pressure
3.1 Definitions of Terms Specific to This Standard:
equivalent (DVPE) value determined by Test Method D 5191
3.1.1 dry vapor pressure equivalent (DVPE)—a value cal-
(see Section 15.2).
culated by a correlation equation from the total pressure (Test
1.3 The values stated in SI units are regarded as standard.
Method D 5191), which is equivalent to the value obtained on
The inch-pound units given in parentheses are provided for
the sample by Test Method D 4953, Procedure A.
information only.
3.1.2 partial pressure from dissolved air (PPA), n—the
1.4 This standard does not purport to address all of the
pressure exerted in vacuum from dissolved air that escapes
safety concerns, if any, associated with its use. It is the
from the liquid phase into the vapor phase.
responsibility of the user of this standard to establish appro-
3.1.3 Reid vapor pressure equivalent (RVPE)—a value cal-
priate safety and health practices and determine the applica-
culated by a correlation equation from the TP , which is
X
bility of regulatory limitations prior to use.
equivalent to the value obtained on the same by Test Method
D 323.
2. Referenced Documents
3.1.4 total pressure (TP ), n—the pressure exerted in
2
X
2.1 ASTM Standards:
vacuum by air- and gas-containing petroleum products, com-
ponents and feedstocks, and other liquids, in the absence of
1
undissolved water at a vapor-liquid ratio of X:1.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
3.1.5 vapor pressure (VP ), n—the total pressure minus the
X
D02.08 on Volatility .
PPA in the liquid at a vapor-liquid ratio of X:1.
Current edition approved Dec. 1, 2003. Published January 2004. Originally
e1
approved in 1999. Last previous edition approved in 1999 as D 6378 – 99 . VP 5 TP 2 PPA (1)
X X
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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D6378–03
4. Summary of Test Method 6.1.1 The measuring chamber shall be designed to contain
between 5 and 15 mL of liquid and vapor and be capable of
4.1 Employing a measuring chamber with a built-in piston,
maintaining a vapor-liquid ratio of 4:1 to 1:1. The accuracy of
...
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