This program assessed the effectiveness of adding anti-oxidant (AO) to various fuels after the fuels leave the refinery. The project involved storing severely hydro-treated fuels for a period of 12 months to simulate the 36 month storage period for vehicles and equipment aboard pre-positioned ships. One fuel contained AO from the refinery and an additional fuel was procured without AO added at the refinery. Each fuel was divided in half with one half being stored as received at 43C and the second half treated with the JP-8 additive package and stored at 43C. The fuel without the AO had AO added upon receipt at TFLRF. A third fuel was added to the matrix that was provided from Australia. This fuel was thought to exhibit poor storage stability characteristics. As with the other fuels, this fuel was divided into two portions with one stored as received and the other additized with the JP-8 additive package and stored at 43C. 15. SUBJECT TERMS Acid Number Peroxide Number ASTM D3241 at 260C ASTM D3241 Breakpoint 16. SECURITY CLASSIFICATION OF: 17. LIMITATION OF ABSTRACT 18. NUMBER OF PAGES 19a. NAME OF RESPONSIBLE PERSON a. REPORT
Alternative jet fuels (Fischer-Tropsch fuels and Biomass derived fuels) lack aromatic compounds and does not provide the desired seal-swell characteristics and other needed “fit-for-purpose” (FFP) properties. The research need is to investigate the effect of alternative fuels and fuel blends on elastomer seals in a simulated turbojet engine environment. In light of this research need, this paper describes the laboratory bench top apparatus that evaluates the engineering performance of elastomer o-rings exposed to alternative fuels and fuel blends under dynamic conditions. The three elastomer materials selected for dynamic tests were Fluorosilicone, Viton, and Buna-N o-rings. The performance of the elastomer o-rings was determined in terms of failure time that was based on fuel leakage past the o-ring seals. Pre-test and post-test elastomer properties were measured. Performance-property envelopes were used as a metric to compare different elastomer materials exposed to the same fuel and further investigate the effect of different alternative fuels on elastomers under dynamic conditions. This paper presents and compares the results from the alternative fuel (R8) and a 50/50 blend containing R-8–JP-8 on all three elastomer materials in terms of performance-property envelope charts.
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