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Ideal ashore fuel system flow diagram
AIRCRAFT REFUELER TRUCK FILL STANDS

Aviation Boatswains Mate F - Aviation theories and other practices
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FUEL-QUALITY MONITORS Fuel-quality monitors (formerly called go/no-go gages) are installed after filter/separators on truck fill stands and on all equipment that directly fuel aircraft. Monitors are not required for use with product receipt filters or those used exclusively for recirculation of fuel. A pressure gage is also installed on each monitor housing so that the differential pressure across the elements can be recorded. If the filter/separator  also  incorporates  fuel  monitor elements, the gage or gages are installed so that the pressure losses across the filter elements and monitor elements can be recorded separately. The fuel-quality monitor (fig. 7-2) provides a continuous check on the cleanness of the fuel passing through the filter/separator. Fuel that meets a predetermined standard of cleanness passes through the monitor with a minimum drop in pressure. Fuel containing quantities of solids and/or water above the predetermined acceptable level is automatically cut off. The fuel-quality monitor has an aluminum housing and various numbers of fuses, depending on the model. Each fuse of the monitor is a self- contained unit consisting of specially treated paper washers housed within a metallic housing and fitted with plastic end fittings. The sensing washers, housed within the metallic housing, absorb free or suspended water from the fuel. RELAXATION CHAMBERS A relaxation chamber, consisting of a tank or piping, follows the fuel monitor, or filter/separator if no monitor is installed in the system. This chamber allows static electric charges, which develop as the fuel passes through the filtration equipment, to “relax” before the fuel enters a tank. Since the fuel must be in contact with the metal walls of the relaxation device for at least 30 seconds, the exact size of the relaxation tank, or length of piping, is determined from the maximum flow rate of the system. Only one relaxation chamber is needed for each fuel monitor, filter/separator combination. Any tank, chamber, or other arrangement used to meet this requirement must assure complete product turnover, have a water drain at its low point, and a manual or automatic air eliminator. Figure 7-2.—Fuel-quality monitor. 7-3







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