ASTM D5188

Standard Test Method for Vapor-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber and Piston Based Method).

Get more information about the standard at  ASTM D5188-23.

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Facts about the ASTM D5188 Standard Test Method

ASTM D5188 is a Standard Test Method for Vapor-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber Method). It covers the determination of the temperature at which the vapor formed from a selected volume of volatile petroleum product saturated with air at 0 to 1°C (32 °F to 34 °F) produces a pressure of one atmosphere in an evacuated chamber of fixed volume. The vapor-liquid ratio of the fuel indicates the tendency of a fuel to vaporize in automotive engine fuel systems. Their specifications generally include T _{(V/L = 20)} limits to ensure products of suitable volatility performance. For high ambient temperatures, a fuel with a high value of T_{(V/L = 20)}, indicating a fuel with a low tendency to vaporize, is generally specified; conversely for low ambient temperatures, a fuel with a low value of T_{(V/L = 20)} is specified.