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Abstract:
In recent years there has been an increasing incidence of reports of the peeling of topcoat material in the ullage space of integral wing tanks in B-52 aircraft. Recent work indicates that with the JP-8/DiEGME combination, the icing inhibitor additive can concentrate in the tank ullage and condense at high concentrations on the upper tank walls. High concentrations of DiEGME cause swelling and subsequent peeling of the epoxy-based topcoat. In this work, we report on the identification and evaluation of alternative icing inhibitor additives that do not cause topcoat delamination in fuel tank upper surfaces. The selection process identified triethylene glycol monomethyl ether (TriEGME) as the most promising candidate for replacement of DiEGME. TriEGME was shown to exhibit equivalent icing inhibition performance to DiEGME, but also exhibits a much lower tendency to negatively impact BMS 10-39 topcoat on aircraft fuel tank ullage surfaces. Subsequent testing was performed to determine the impact of TriEGME on compatibility with other fuel system materials and its effect on fuel properties.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Interim rept. 1 Mar 2006-27 Aug 2010 |
| Pages: |
336 |
| Report Date: |
AUG 2010 |
| Contract Number: |
F33615-03-2-2347 |
| Report Number: |
A149145 |
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