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Storage Tank Diffuser
SEAWATER PIPING AND VALVE ARRANGEMENT

Aviation Boatswains Mate F - Aviation theories and other practices
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Figure 6-8.—Level indicating panel (rear view). the two liquids (gasoline and seawater) varies and converts this differential to gallons of gasoline. There are four components to this gage: • In-tank reservoir, an upper and lower reservoir for each of the inner and outer tanks (a total of four reservoirs) • A panel in the pump room, which contains the following: Differential pressure gage Multifunction selector Flow-limiting valve Seawater pressure gage Purge valve Flow indicator Operating instructions • Water-filled connecting lines connect the in- tank reservoirs to the gage panel. • Seawater supply for purging consists of the fol- lowing: Firemain cutout valve Strainer Pressure-reducing valve Pressure gage Bypass purge line Bypass purge valve Most of the components are installed to aid in purging the system. Only three items are necessary for the actual gaging of the tanks. These are the differential pressure gage, water-filled connecting lines, and the upper and lower in-tank reservoirs. When the storage tanks are full (100%) of seawater, a constant differential pressure exists between the upper and lower in-tank reservoirs, and the differential pressure gage reads ZERO. As the storage tanks are filled with gasoline, a varying differential pressure is developed between the upper and lower in-tank reservoirs. This varying differential pressure, created by the difference in specific gravities of the two liquids (gasoline and seawater), is transmitted to the gage panel through the water-filled connecting lines. The differential pressure gage senses this varying differential pressure and converts it to gallons of gasoline present in the storage tank. The differential pressure gage (fig. 6-9) measures the varying pressure differential from the tank and Figure 6-9.—Differential pressure gage. 6-9







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