IP 394: Liquid petroleum products - Vapour pressure - Part 1: Determination of air saturated vapour pressure (ASVP) and calculated dry vapour pressure equivalent (DVPE)

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  • Method adopted/last revised: 2008
  • Method reapproved: None
  • REF/ISBN: IP394-2934869
  • Status: Current
  • First printed in STM books: January 2008


This European Standard specifies a method for the determination of the total pressure, exerted in vacuo, by volatile, low viscosity petroleum products, components, and feedstocks containing air. A dry vapour pressure equivalent (DVPE) can be calculated from the air containing vapour pressure (ASVP) measurement.

The conditions used in the test described in this standard are a vapour-to-liquid ratio of 4:1 and a test temperature of 37,8 °C.

For referee testing the requirement to employ 1 l sample containers is mandatory. However, due to sample container size restrictions in taking automatic samples from vapour-locks either onboard a ship or from some land based storage tanks, the precision for 250 ml containers forms part of this standard and shall be used for referee purposes.

NOTE 1 This standard states precision for both 1 l and 250 ml sample containers. Annex A provides information on the precision values when using 50 ml at 37,8 °C or using 1 l samples at a test temperature of 50,0 °C.

The equipment is not wetted with water during the test, and the method described is therefore suitable for testing samples with or without oxygenates; no account is taken of dissolved water in the sample.

This method described is suitable for testing airsaturated samples that exert an air-saturated vapour pressure of between 9,0 kPa and 150,0 kPa at 37,8 °C. This document is applicable to fuels containing oxygenated compounds up to the limits stated in the relevant EC Directive 85/536/EEC [4].

NOTE 2 For the purposes of this European Standard, the term "% (m/m)"and % (V/V) are used to represent the mass, respectively the volume fraction.

(Includes an additional informative note)

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