Full Description

1.1This 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 including ethanol blends up to 85% (volume fraction). This test method is suitable for testing samples with boiling points above 0C (32F) that exert a vapor pressure between 7kPa and 150kPa (1.0psi and 21psi) at 37.8C (100F) 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 5).

Note 1:The test method is suitable for the determination of the vapor pressure of volatile, liquid petroleum products at temperatures from 0C to 100C at vapor to liquid ratios of 4:1 to 1:1 (X = 4 to 1) and pressures up to 500kPa (70psi), but the precision statement (see Section 16) may not be applicable.

Note 2:The precision (see Section 16) using 1 L containers was determined in a 2003 interlaboratory study (ILS);2 the precision using 250mL containers was determined in a 2016 ILS.3

1.2This test method also covers the use of automated vapor pressure instruments to determine the vapor pressure exerted in vacuum by aviation turbine fuels. This test method is suitable for testing aviation turbine fuel samples with boiling points above 0C (32F) that exert a vapor pressure between 0kPa and 110kPa (0psi and 15.5psi) at a vapor-to-liquid ratio of 4:1, in the temperature range from 25C to 100C (77F to 212F).

Note 3:The precision (see Section 16) for aviation turbine fuels using 100 mL containers was determined in a 2007 ILS.4

1.3The vapor pressure (VP_X) 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 D5191 (see 16.3). This condition does not apply when the sample is aviation turbine fuel.

1.4The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.5This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 7.2 - 7.8.

1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.