Cochin laboratory

HSD-(D 2274, IP 388, ISO 12205)

This test method provides a basis for the estimation of the storage stability of middle distillate fuels with an IBP above 175°C and a 90 % recovery point below 370°C. It is not applicable to fuels containing residual oil, or any significant component derived from a nonpetroleum source. This test method may not provide a prediction of the quantity of insolubles that will form in field over any given period of time.

JFTOT (P 97, D 3241, IP 323, ISO 6249)

Thermal oxidative stability is the ability of the liquid to withstand relatively high temperatures for short periods of time in the presence of oxidation and without the formation of sediment or deterioration of properties. The thermal stress experienced by aviation fuel in modern jet engines may lead to the formation of undesirable and possibly harmful insoluble materials, such as lacquers, on heat exchangers and control surfaces that reduce efficiency and require extra maintenance. This test method covers the procedure for rating the tendencies of gas turbine fuels to deposit decomposition products within the fuel system. The test results can be used to assess the level of deposits that form when the liquid fuel contacts a heated surface at a specified temperature.