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Effect of Very Low Sulfur in JP-5 Fuel on Hot Corrosion,
PHILLIPS PETROLEUM CO BARTLESVILLE OKLA RESEARCH AND DEVELOPMENT DEPT
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The report discusses an investigation to determine whether the present limit of 0.4 per cent by weight 4,000 ppm of sulfur in JP-5 fuel is a safe level for the protection of turbine-blade materials from hot corrosion in high-performance engines when operated in a marine environment. The present study shows that a 100-fold reduction in the sulfur limit to 40 ppm would not reduce hot corrosion significantly. Such reductions in the sulfur limit would drastically curtail fuel availability, since they approach the mean and the minimum of current production, and could cause critical problems in logistics. It was found that the use of an essentially sulfur-free fuel, containing only 4 ppm sulfur, significantly decreased both the surface scale on specimens and the weight lost by specimens of a wide variety of superalloys and superalloy-coating systems when exposed under conditions which simulate those in an aircraft-turbine engine ingesting air with 1 ppm sea salt. Thus, indications are that the sulfur in fuel must be below a threshold concentration to improve the durability of turbine-blade materials. Author
APPROVED FOR PUBLIC RELEASE