IP 481: Determination of air saturated vapour pressure (ASVP) of crude oil

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  • Method adopted/last revised:
  • Method reapproved: 2020
  • Status: Current
  • First printed in STM books: 2012

This standard specifies a method for the determination of the total pressure exerted in vacuo, by aircontaining crude oil at 37,8 °C and with a vapour to
liquid ratio of 4:1. The samples of crude oil used to obtain the precision statement for this method had viscosities in the range 3,5 mm2/s to 1 2,5 mm2/s
at 20 °C. No account is made of dissolved water in the sample. A Reid equivalent vapour pressure can be calculated from the ASVP measurement.

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