Work Item
ASTM WK66751

Revision of D5188-16 Standard Test Method for Vapor-Liquid Ratio Temperature Determination of Fuels (Evacuated Chamber and Piston Based Method)


Several users have reported a measurement difference between the piston based vapor pressure and the evacuated chamber instruments. The two methods are according the ASTM published standard D5188, Vapor-Liquid Ratio for Temperature Determination of Fuels. Using pure components, such as CRMs used to verify calibration, no difference between the two methods can be observed. Early testing, using typical gasoline samples as a control check, indicates that the new piston-based instrument measures about 1C (2-3 degrees F) higher compared to older systems.


Developed by Subcommittee: D02.08

Committee: D02

Staff Manager: Alyson Fick

Work Item Status

Date Initiated: 01-29-2019

Technical Contact: Oliver Sauer

Item: 000