IP 138: Determination of oxidation stability of aviation fuel Potential residue method copy

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  • Method adopted/last revised: 2014
  • Method reapproved: 2015
  • REF/ISBN: IP138-2936900
  • Status: Current
  • First printed in STM books: April 2014


This standard specifies a method for the determination of the stability of aviation fuels in their finished form only for reciprocating, turbine, and jet engines, under accelerated oxidation conditions.

This method is not intended for the determination of the stability of aviation gasoline components individually, particularly those with a high percentage of low-boiling unsaturated compounds, as they may cause explosive conditions within the apparatus. However, because of the unknown nature of certain samples, the specified pressure vessel assembly includes a safety burst-disc in order to safeguard the operator.

The results may be used as an indication of the tendency of these fuels to form gum and deposits in storage. It should be recognized, however, that this correlation may vary markedly under different storage conditions and with different aviation fuels.

NOTE 1 Precision for this standard has only been determined for an aging period of 16 h.

NOTE 2 For the measurement of the oxidation stability (induction period) of motor gasoline, IP 40 should be used.

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