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ASTM D 5482 Document Information:
Title
Standard Test Method for Vapor Pressure of Petroleum Products (Mini Method - Atmospheric)
ASTM International
Publication Date:
Nov 1, 2007
Scope:
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.
Some gasoline-oxygenate blends my 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).
This test method is a modification of Test Method D 5191 (Mini
Method) in which the test chamber is at atmospheric pressure prior
to sample injection.
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.
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 D 4953.
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 through 7.7.)
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- dry vapor pressure equivalent
- gasoline
- hydrocarbon-oxygenate blends
- mini method-atmospheric
- petroleum products
- vapor pressure
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