ASTM D5482-07(2013)
(Test Method)Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method—Atmospheric)
Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method—Atmospheric)
SIGNIFICANCE AND USE
5.1 Vapor pressure is an important physical property of volatile liquids.
5.2 Vapor pressure is critically important for both automotive and aviation gasolines, affecting starting, warm-up, and tendency to vapor lock with high operating temperatures or high altitudes. Maximum vapor pressure limits for gasoline are legally mandated in some areas as a measure of air pollution control.
SCOPE
1.1 This test method covers a procedure for the determination of total vapor pressure of petroleum products using automatic vapor pressure instruments. The test method is suitable for testing samples with boiling points above 0°C (32°F) that exert a vapor pressure between 7 and 110 kPa (1.0 and 16 psi) at 37.8°C (100°F) at a vapor-to-liquid ratio of 4:1. The test method is applicable to gasolines containing oxygenates. No account is made of dissolved water in the sample. Note 1—Because the external atmospheric pressure does not influence the resultant vapor pressure, this vapor pressure is an absolute pressure at 37.8°C (100°F) in kPa (psi). This vapor pressure differs from the true vapor pressure of the sample due to some small vaporization of the sample and dissolved air into the air of the confined space.
1.1.1 Some gasoline-oxygenate blends may show a haze when cooled to 0 to 1°C. If a haze is observed in 8.5, it shall be indicated in the reporting of results. The precision and bias statements for hazy samples have not been determined (see Note 6).
1.2 This test method is a modification of Test Method D5191 (Mini Method) in which the test chamber is at atmospheric pressure prior to sample injection.
1.3 This test method covers the use of automated vapor pressure instruments that perform measurements on liquid sample sizes in the range from 1 to 10 mL.
1.4 This test method is suitable for the determination 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 is considered equivalent to the result obtained on the same material when tested by Test Method D4953.
1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D5482 − 07 (Reapproved 2013)
Standard Test Method for
Vapor Pressure of Petroleum Products (Mini Method—
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Atmospheric)
This standard is issued under the fixed designation D5482; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers a procedure for the determina-
responsibility of the user of this standard to establish appro-
tion of total vapor pressure of petroleum products using
priate safety and health practices and determine the applica-
automatic vapor pressure instruments. The test method is
bility of regulatory limitations prior to use. (For specific
suitable for testing samples with boiling points above 0°C
warning statements, see 7.2 through 7.7.)
(32°F) that exert a vapor pressure between 7 and 110 kPa (1.0
and 16 psi) at 37.8°C (100°F) at a vapor-to-liquid ratio of 4:1.
2. Referenced Documents
The test method is applicable to gasolines containing oxygen-
2
2.1 ASTM Standards:
ates. No account is made of dissolved water in the sample.
D4057 Practice for Manual Sampling of Petroleum and
NOTE 1—Because the external atmospheric pressure does not influence
Petroleum Products
the resultant vapor pressure, this vapor pressure is an absolute pressure at
D4175 Terminology Relating to Petroleum, Petroleum
37.8°C (100°F) in kPa (psi). This vapor pressure differs from the true
Products, and Lubricants
vaporpressureofthesampleduetosomesmallvaporizationofthesample
and dissolved air into the air of the confined space.
D4953 Test Method for Vapor Pressure of Gasoline and
Gasoline-Oxygenate Blends (Dry Method)
1.1.1 Some gasoline-oxygenate blends may show a haze
D5190 Test Method for Vapor Pressure of Petroleum Prod-
when cooled to 0 to 1°C. If a haze is observed in 8.5, it shall
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ucts (Automatic Method) (Withdrawn 2012)
be indicated in the reporting of results. The precision and bias
D5191 Test Method for Vapor Pressure of Petroleum Prod-
statements for hazy samples have not been determined (see
ucts (Mini Method)
Note 6).
1.2 This test method is a modification of Test Method
3. Terminology
D5191 (Mini Method) in which the test chamber is at atmo-
3.1 Definitions:
spheric pressure prior to sample injection.
3.1.1 dry vapor pressure equivalent (DVPE), n—value cal-
1.3 This test method covers the use of automated vapor
culated by a defined correlation equation, that is expected to be
pressure instruments that perform measurements on liquid
comparable to the vapor pressure value obtained by Test
sample sizes in the range from 1 to 10 mL.
Method D4953, Procedure A.
1.4 This test method is suitable for the determination of the
3.1.2 gasoline-oxygenate blend, n—spark-ignition engine
dry vapor pressure equivalent (DVPE) of gasoline and
fuel consisting primarily of gasoline with one or more oxygen-
gasoline-oxygenate blends by means of a correlation equation
ates.
(see 13.2). The calculated DVPE is considered equivalent to
3.1.3 oxygenate, n—oxygen-containing ashless organic
the result obtained on the same material when tested by Test
compound, such as an alcohol or ether, which may be used as
Method D4953.
a fuel or fuel supplement. D4175
1.5 The values stated in SI units are to be regarded as the
3.1.4 platinum resistance thermometer, n— temperature
standard. The values given in parentheses are for information
measuring device with platinum wire, whose electrical resis-
only.
tance changes in relation to temperature.
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This test method is under the jurisdiction of ASTM Committee D02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
D02.08 on Volatility. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved June 1, 2013. Published August 2013. Originally the ASTM website.
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approved in 1993. Last previous edition approved in 2007 as D5482 – 07. DOI: The last approved version of this historical standard is referenced on
10.1520/D5482-07R13. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5482 − 07 (2013)
3.1.5 total vapor pressure, n—observed pressure measured 6.1.3 A thermostatically controlled heater shall be used to
in the experiment, that is the sum of the partial pressure of the ma
...
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