ASTM D5191-02
(Test Method)Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)
Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)
SCOPE
1.1 This test method covers the use of automated vapor pressure instruments to determine the total vapor pressure exerted in vacuum by air-containing, volatile, liquid petroleum products. This test method is suitable for testing samples with boiling points above 0oC (32oF) that exert a vapor pressure between 7 and 130 kPa (1.0 and 18.6 psi) at 37.8oC (100oF) at a vapor-to-liquid ratio of 4:1. Measurements are made on liquid sample sizes in the range from 1 to 10 mL. No account is made for dissolved water in the sample.
Note 1—Samples can also be tested at other vapor-to-liquid ratios, temperatures, and pressures, but the precision and bias statements need not apply.
1.1.1 Some gasoline-oxygenate blends may show a haze when cooled to 0 to 1oC. If a haze is observed in , it shall be indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see Note 10).
1.2 This test method is suitable for calculation of the dry vapor pressure equivalent (DVPE) of gasoline and gasoline-oxygenate blends by means of a correlation equation (see 13.2). The calculated DVPE very closely approximates the dry vapor pressure that would be obtained on the same material when tested by Test Method D4953.
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. For specific warning statements, see 7.2 through 7.7.
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An American National Standard
Designation: D 5191 – 02
Standard Test Method for
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Vapor Pressure of Petroleum Products (Mini Method)
This standard is issued under the fixed designation D 5191; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * D 2892 Test Method for Distillation of Crude Petroleum
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(15-Theoretical Plate Column)
1.1 This test method covers the use of automated vapor
D 4057 Practice for Manual Sampling of Petroleum and
pressure instruments to determine the total vapor pressure
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Petroleum Products
exerted in vacuum by air-containing, volatile, liquid petroleum
D 4953 Test Method for Vapor Pressure of Gasoline and
products. This test method is suitable for testing samples with
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Gasoline-Oxygenate Blends (Dry Method)
boiling points above 0°C (32°F) that exert a vapor pressure
D 5190 Test Method for Vapor Pressure of Petroleum Prod-
between 7 and 130 kPa (1.0 and 18.6 psi) at 37.8°C (100°F) at
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ucts (Automatic Method)
a vapor-to-liquid ratio of 4:1. Measurements are made on liquid
sample sizes in the range from 1 to 10 mL. No account is made
3. Terminology
for dissolved water in the sample.
3.1 Definitions of Terms Specific to This Standard:
NOTE 1—Samples can also be tested at other vapor-to-liquid ratios,
3.1.1 absolute pressure—the pressure of the air-free sample.
temperatures, and pressures, but the precision and bias statements need not
It is calculated from the total pressure of the sample by
apply.
subtracting out the partial pressure of the dissolved air.
1.1.1 Some gasoline-oxygenate blends may show a haze
3.1.2 dry vapor pressure equivalent (DVPE)—a value cal-
when cooled to 0 to 1°C. If a haze is observed in 8.5, it shall
culated by a correlation equation (see 13.2) from the total
be indicated in the reporting of results. The precision and bias
pressure.
statements for hazy samples have not been determined (see
3.1.2.1 Discussion—The DVPE is expected to be equivalent
Note 10).
to the value obtained on the sample by Test Method D 4953,
1.2 This test method is suitable for calculation of the dry
Procedure A.
vapor pressure equivalent (DVPE) of gasoline and gasoline-
3.1.3 total pressure—the observed pressure measured in the
oxygenate blends by means of a correlation equation (see
experiment that is the sum of the partial pressure of the sample
13.2). The calculated DVPE very closely approximates the dry
and the partial pressure of the dissolved air.
vapor pressure that would be obtained on the same material
4. Summary of Test Method
when tested by Test Method D 4953.
1.3 The values stated in SI units are regarded as standard.
4.1 A known volume of chilled, air-saturated sample is
The inch-pound units given in parentheses are provided for
introduced into an evacuated, thermostatically controlled test
information only.
chamber, the internal volume of which is five times that of the
1.4 This standard does not purport to address all of the
total test specimen introduced into the chamber. After injection
safety concerns, if any, associated with its use. It is the
into the test chamber, the test specimen is allowed to reach
responsibility of the user of this standard to establish appro-
thermal equilibrium at the test temperature, 37.8°C (100°F).
priate safety and health practices and determine the applica-
The resulting rise in pressure in the chamber is measured using
bility of regulatory limitations prior to use. For specific
a pressure transducer sensor and indicator. Only total pressure
warning statements, see 7.2 through 7.7.
measurements (sum of the partial pressure of the sample and
the partial pressure of the dissolved air) are used in this test
2. Referenced Documents
method, although some instruments can measure the absolute
2.1 ASTM Standards:
pressure of the sample as well.
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.08 on Volatility.
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Current edition approved August 10, 2002. Published October 2002. Originally Annual Book of ASTM Standards, Vol 05.01.
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published as D 5191–91. Last previous edition D 5191–01. Annual Book of ASTM Standards, Vol 05.02.
*A Summary of Changes section appears at the end of this standard.
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D5191–02
4.2 The measured total vapor pressure is converted to a dry 6.5 Pressure
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