ASTM D6378-06
(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. The liquid sample volume size required for analysis is dependent upon the vapor-to-liquid ratio chosen (see Note 1) and the measuring chamber volume capacity of the instrument (see 6.1.1 and Note 3).Note 1
The test method is suitable for the determination of the vapor pressure of volatile, liquid petroleum products at temperatures from 0 to 100C 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 16.2) may not be applicable.
1.2 The vapor pressure (VPX) determined by this test method at a vapor-liquid ratio of 4:1 (X = 4) of gasoline and gasoline-oxygenate blends at 37.8C can be correlated to the dry vapor pressure equivalent (DVPE) value determined by Test Method D 5191 (see ).
1.3 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. For specific warning statements, see 7.2-7.8.
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An American National Standard
Designation:D6378–06
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* 2. Referenced Documents
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1.1 This test method covers the use of automated vapor 2.1 ASTM Standards:
pressureinstrumentstodeterminethevaporpressureexertedin D 323 Test Method for Vapor Pressure of Petroleum Prod-
vacuum by volatile, liquid petroleum products, hydrocarbons, ucts (Reid Method)
and hydrocarbon-oxygenate mixtures. This test method is D 2892 Test Method for Distillation of Crude Petroleum
suitable for testing samples with boiling points above 0°C (15-Theoretical Plate Column)
(32°F) that exert a vapor pressure between 7 and 150 kPa (1.0 D 4057 Practice for Manual Sampling of Petroleum and
and 21psi) at 37.8°C (100°F) at a vapor-to-liquid ratio of 4:1. Petroleum Products
The liquid sample volume size required for analysis is depen- D 4177 Practice for Automatic Sampling of Petroleum and
dent upon the vapor-to-liquid ratio chosen (see Note 1) and the Petroleum Products
measuring chamber volume capacity of the instrument (see D 4953 Test Method for Vapor Pressure of Gasoline and
6.1.1 and Note 3). Gasoline-Oxygenate Blends (Dry Method)
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 = 4 to 1) and pressures up
Volatility Measurement
to 500 kPa (70 psi), but the precision statement (see Section 16) may not
be applicable.
D 5854 Practice for Mixing and Handling of Liquid
Samples of Petroleum and Petroleum Products
1.2 The vapor pressure (VP ) determined by this test
X
D 6299 Practice for Applying Statistical Quality Assurance
method at a vapor-liquid ratio of 4:1 (X = 4) of gasoline and
Techniques to Evaluate Analytical Measurement System
gasoline–oxygenate blends at 37.8°C can be correlated to the
Performance
dry vapor pressure equivalent (DVPE) value determined by
D 6708 Practice for Statistical Assessment and Improve-
Test Method D 5191 (see 16.2).
ment of Expected Agreement Between Two Test Methods
1.3 The values stated in SI units are to be regarded as the
that Purport to Measure the Same Property of a Material
standard. The values given in parentheses are for information
only.
3. Terminology
1.4 This standard does not purport to address all of the
3.1 Definitions of Terms Specific to This Standard:
safety concerns, if any, associated with its use. It is the
3.1.1 dry vapor pressure equivalent (DVPE)—a value cal-
responsibility of the user of this standard to establish appro-
culated by a correlation equation from the total pressure (Test
priate safety and health practices and determine the applica-
Method D 5191), which is equivalent to the value obtained on
bility of regulatory limitations prior to use. For specific
the sample by Test Method D 4953, Procedure A.
warning statements, see 7.2-7.8.
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This test method is under the jurisdiction of ASTM Committee D02 on
2
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D02.08 on Volatility. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved Aug. 1, 2006. Published September 2006. Originally Standards volume information, refer to the standard’s Document Summary page on
approved in 1999. Last previous edition approved in 2003 as D 6378–03. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6378–06
3.1.2 partial pressure from dissolved air (PPA), n—the expansion to the desired vapor-liquid ratio. A static pressure
pressure exerted in vacuum from dissolved air that escapes transducer shall be incorporated in the piston. The measuring
from the liquid phase into the vapor phase. chamber shall contain an inlet/outlet valve combination for
3.1.3 Reid vapor pressure equivalent (RVPE)—a value cal- sample introduction and expulsion. The piston and the valve
culated by a correlation equation from t
...
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