Reduction of Electrostatic Charge in Jet Fuels during Refueler Loading
NAVAL RESEARCH LAB WASHINGTON DC
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A 30-second relaxation chamber and a static charge reducer SCR were evaluated for their effectiveness in dissipating the electrostatic charge during refueler loading of JP-5 fuel at flow rates of 300 to 540 gpm. The electrical conductivity of the JP-5 fuel was in the range of 0.1 to 10 C. U. at 78F 1 C.U. 1 X 10 to the minus 14 power mhoscm. A JP-4 fuel with a conductivity of 7.8 C.U. was also tested to a limited extent. The experimental setup consisted of a 600-gpm filterseparator equipped with fuel monitors, a 30- second relaxation chamber, and a static charge reducer located in parallel downstream of the filterseparator, a 13-ft refueling hose 2-12in. or 3-in. diameter, and either a 7050- or a 8200-gallon refueler. The charge density in the fuel was measured immediately downstream of the filterseparator, at the outlet of the relaxation device, and at the dry break or loading connection to the refueler.