A Study of Variables Affecting Results in the D2274 Accelerated Stability Test. Part 2. Effects of Selected Chemical Variables
Research and development rept.
DAVID TAYLOR RESEARCH CENTER BETHESDA MD SHIP MATERIALS ENGINEERING DEPT
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Different laboratories have been unable to obtain comparable stability results on a fuel sample when the ASTM D2274 test procedure has been used. This Center is attempting to identify critical variables that causes inconsistencies. Five chemical variables were examined that included oxygen purity, residual acidity, metallic contacts, copper concentrations, and exposure to ultraviolet light. Experiments with nitrogen, air, and oxygen show that insolubles increase with oxygen concentration. Other experiments show that acidity, iron oxide, iron-copper coils, ultraviolet radiation, and increasing levels of cupric acetyl acentonate yield increasing amounts of insolubles. The general conclusion is that the samples should not be shipped in contact with metallic or rusty cans they should not be exposed to light during sampling, shipping, or laboratory testing and they should not contact copper-containing metals. Further, laboratory personnel should ensure that all traces of acidic cleaning compounds are removed from glassware and that only high purity oxygen is used. Keywords Navy fuels Diesel fuels Distillates Fuel stability.