Determination of the Minimum Use Level of Fuel System Icing Inhibitor (FSII) in JP-8 That Will Provide Adquate Icing Inhibition and Biostatic Protection for Air Force Aircraft.

摘要

Fuel System Icing Inhibitor (FSII) additive, a mandatory additive in JP-8, is used to prevent solidification of free water in the fuel and to provide protection against microbial growth in fuel systems. The current FSII additive approved for use is Di-Ethylene Glycol Monomethyl Ether (DiEGME). The fuel specifications require that JP-8 be procured with 0.10 to 0.15% by volume of FSII (MIL DTL 83133F) with an on-aircraft minimum use limit of 0.07% (USAF T.O. 42B-1-1). The objective of the current study was to determine if the required minimum use concentration of FSII in JP-8 can be reduced and still provide similar icing inhibition and biostatic capability as the current 0.07% requirement. A reduction in the required FSII concentration will result in significant fuel/logistical cost savings and could reduce the occurrence of FSII-related Fuel Tank Topcoat Peeling in certain aircraft fuel tanks. This report provides an overall summary of the experimental studies and analyses performed and the resulting recommendations. Results from the present effort indicated that a minimum use limit of 0.04% by volume of FSII will provide for safe operation under expected water levels and flight conditions for aircraft operating with JP-8. Biological growth studies indicated comparable bioefficacy to current requirement levels should be maintained.