ASTM D323 for vapor pressure of petroleum products (Reid method)
PROCEDURE D FOR AVIATION GASOLINES APPROXIMATELY 50 kPa (7 psi) REID VAPOR PRESSURE
21. Introduction
21.1 The following sections define changes in apparatus and procedure for the determination of the vapor pressure of aviation gasoline. Except as specifically stated hererin, all the requirements set forth in Sections 1-11 shall apply.
22. Apparatus
22.1 Ratio of Vapor and Liquid Chambers - The ratio of the volume of the vapor chamber to the volume of the liquid chamber shall be between the limits of 3.95 and 4.05 (see A1.1.4).
23. Sampling
23.1 Refer to Section 7.
24. Preparation for Test
24.1 Checking the Pressure Gage or Pressure Transducer - The gage shall be checked at 50 kPa (7 psi) against a mercury column ( or some other calibrated pressure measuring device) before each vapor pressure measurement to ensure that it conforms to the requirements of A1.2. This preliminary check shall be made in addition to the final gage comparison specified in 11.4 or 14.4.
25. Procedure
25.1 Refer to Section 11.
26. Keywords
26.1 crude oils; gasoline; Reid vapor pressure; spark-ignition engine fuel; vapor pressure; volatility
