Presion De Vapor Reid

Designation: D 323 – 08

An American National Standard

Standard Test Method for

Vapor Pressure of Petroleum Products (Reid Method)1
This standard is issued under the fixed designation D 323; 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 lastreapproval. A superscript epsilon (´) 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* 1.1 This test method covers procedures for the determination of vapor pressure (see Note 1) of gasoline, volatile crude oil, and other volatile petroleum products. 1.2 Procedure A is applicable togasoline and other petroleum products with a vapor pressure of less than 180 kPa (26 psi). 1.3 Procedure B may also be applicable to these other materials, but only gasoline was included in the interlaboratory test program to determine the precision of this test method. 1.4 Procedure C is for materials with a vapor pressure of greater than 180 kPa (26 psi). 1.5 Procedure D for aviation gasoline with avapor pressure of approximately 50 kPa (7 psi).
NOTE 1—Because the external atmospheric pressure is counteracted by the atmospheric pressure initially present in the vapor chamber, the Reid vapor pressure is an absolute pressure at 37.8°C (100°F) in kilopascals (pounds-force per square inch). The Reid vapor pressure differs from the true vapor pressure of the sample due to some small samplevaporization and the presence of water vapor and air in the confined space.

responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in Sections 7 and 18, and 12.5.3, 15.5, 21.2, A1.1.2, A1.1.6, and A2.3. 2. Referenced Documents 2.1 ASTM Standards:2 D1267 Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method) D 4057 Practice for Manual Sampling of Petroleum and Petroleum Products D 4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants D 4953 Test Method for Vapor Pressure of Gasoline and Gasoline-Oxygenate Blends (Dry Method) D 6377 Test Method for Determination of Vapor Pressure of Crude Oil:VPCRx(Expansion Method) D 6897 Test Method for Vapor Pressure of Liquefied Petroleum Gases (LPG) (Expansion Method) E 1 Specification for ASTM Liquid-in-Glass Thermometers 2.2 Energy Institute Standards: IP 481 Test Method for Determination of the Air Saturated Vapour Pressure (ASVP) of Crude Oil3 3. Terminology 3.1 Definitions: 3.1.1 Bourdon spring gauge, n—pressure measuring device that employs aBourdon tube connected to an indicator. 3.1.2 Bourdon tube, n—flattened metal tube bent to a curve that straightens under internal pressure. 3.1.3 gasoline-oxygenate blend, n—spark-ignition engine fuel consisting primarily of gasoline with one or more oxygenates. 3.1.4 oxygenate, n—oxygen-containing ashless organic compound, such as an alcohol or ether, which may be used as
2 For referenced ASTMstandards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards volume information, refer to the standard’s Document Summary page on the ASTM website. 3 Available from Energy Institute, 61 New Cavendish St., London, WIG 7AR, U.K., http://www.energyinst.org.uk.

1.6 This test method is not applicable to liquefied petroleum gasesor fuels containing oxygenated compounds other than methyl t-butyl ether (MTBE). For determination of the vapor pressure of liquefied petroleum gases, refer to Test Method D 1267 or Test Method D 6897. For determination of the vapor pressure of gasoline-oxygenate blends, refer to Test Method D 4953. The precision for crude oil has not been determined since the early 1950s (see Note 3). Test...