Investigation of the Effects of Trace Metals on the Thermal Stability of JP-7 Fuels
Technical Report,01 Dec 1970,30 Nov 1971
SOUTHWEST RESEARCH INST SAN ANTONIO TX SAN ANTONIO United States
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Experimental studies have shown that trace amounts of fuel-soluble metal compounds can be very detrimental to JP-7, a high-quality jet fuel. Adverse effects on fuel thermal stability have been demonstrated by gas-drive fuel coker tests on JP-7 fuels containing as little as 15 to 25 parts per billion of added iron or copper, or 100 to 250 parts per billion of added zinc or lead. The true threshold concentrations were generally lower, since the added metal tended to disappear from fuel samples during storage and handling. The ambiguities in metal content hinder any clear correlation and make it impractical to recommend metal-content limits for fuel quality control.