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The practical value of the ASTM D3241 JFTOT procedure. for evaluating jet fuel thermal oxidation stability is limited by the lack of a quantitative measurement of heater tube deposition. Both the visual and the TDR methods have been shown to be disproportionately responsive to highly colored deposits and neither method appropriately deals with so-called “peacock” films. Destructive methods which determine deposits as total carbon require the availability of expensive, specialized analyzers and it is often difficult to obtain reliable measurements from thin deposits. This paper will describe an automated device which has been developed to determine deposit volumes by measurements of light interference. Data acquisition, data manipulation and volume calculations are performed under control of menu-driven software on a personal computer. Within the applicable thickness range, the device provides a means to obtain a reliable measurement of deposit volume which is not affected by the tube composition.
JFTOT, interferometry, tube deposit volume, jet fuels, thermal stability
research chemist, Fuels Section of the Chemistry Division of the Naval Research Laboratory, Washington, DC,