IP 409: Liquid petroleum products — Vapour pressure — Part 2: Determination of absolute vapour pressure (AVP) between 40 °C and 100 °C

Document options

EI Technical Partners get free access to publications. You will need to Login or Register here

  • Method adopted/last revised: 2008
  • Method reapproved: 2012
  • REF/ISBN: IP409-2939444
  • Status: Current
  • First printed in STM books: February 2008


This European Standard specifies a method for the determination of absolute vapour pressure of liquid petroleum products at elevated temperatures.

The conditions used in the test described in this standard are a vapour to liquid ratio of 3:2 and an initial injection temperature of 37,8 °C or 30,0 °C. The method described is suitable for testing airsaturated samples that exert an air-saturated vapour pressure of between 9 kPa and 500 kPa at temperatures between 40 °C and 100 °C.

This European Standard is applicable to fuels containing oxygenated compounds up to the limits stated in the relevant EC Directive 85/536/EEC [3].

NOTE 1 If a sample injection is into a test chamber which is raised to 37,8 °C and the vapour to liquid ratio is 4:1, the initial measurement corresponds with the measurement in Part 1 of this standard.

NOTE 2 For the purposes of this European Standard, the term % (V/V) is used to represent the volume fraction.

WARNING - Use of this standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

Members Benefits

Are you an EI Member? If yes, register/log in now to ensure you receive free access or discounts to EI publications. How to do this:

1. Sign up/register with this site.

2. Log in

3. Link your membership details to your profile, on your profile page.

If you are not a Member, why not join today and receive all of the benefits of EI Membership? EI Members are entitled to a 25% discount on most EI publications.