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ASTM D 5191 Document Information:
Title
Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method)
ASTM International
Publication Date:
May 1, 2007
Scope:
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
0°C (32°F) that exert a vapor pressure between 7 and 130 kPa (1.0
and 18.6 psi) 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. 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.
NOTE 2—The interlaboratory studies conducted in 1988, 1991, and
2003 to determine the precision statements in Test Method D 5191
did not include any crude oil in the sample sets. Test Method D
6377, as well as IP 481, have been shown to be suitable for vapor
pressure measurements of crude oils.
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 14).
This test method is suitable for calculation of the dry vapor
pressure equivalent (DVPE) of gasoline and gasolineoxygenate blends
by means of a correlation equation (see Eq 1 in 14.2). The
calculated DVPE very closely approximates the dry vapor pressure
that would be obtained on the same material when tested by Test
Method D 4953.
The values stated in SI units are regarded as standard. The
inch-pound units given in parentheses are provided 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 applicability of
regulatory limitations prior to use. For specific safety
warning statements, see 7.2 through 7.8.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- dry vapor pressure
- gasoline
- hydrocarbon-oxygenate blends
- mini method
- petroleum products
- vapor pressure
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