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Typical service system
JP-5 FUELING SYSTEM COMPONENTS

Aviation Boatswains Mate F - Aviation theories and other practices
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Figure 4-6.—Typical service system pump-room piping arrangement. The service pump discharge header is common to all four service pumps. Like the suction header, it is divided into port and starboard headers by a set of crossover valves. The cross-connection to the transfer pump discharge header is used with, and for the same purpose as, the cross-connection between the respective suction headers of the transfer and service pumps. They are also used to drain back the service piping for maintenance. From the service pump common discharge header (on the seventh deck), the distribution riser extends directly to the filter room (on the third deck). JP-5 enters the service filter through the inlet section and leaves the filter through the discharge line attached to the clearwell chamber and the automatic shutoff valve. Both inlet and discharge have shutoff valves. The filters are also provided with a bypass line. This line fitted with a shutoff valve (locked closed), is installed between the filter inlet and discharge lines. The bypass line is primarily used for draining back the distribution piping for maintenance. As the distribution piping leaves the discharge side of the service filter, it is divided into two sections (commonly called “legs”). Each leg extends outboard; one goes forward to supply all the service stations in the forward section of the quadrant, and the other goes aft to supply all the service stations in the aft section of the quadrant. This piping may or may not run outside the skin of the ship and is known as the outboard distribution main. The aft leg of the forward quadrant and the forward leg of the aft quadrant are connected by a set of cross-over valves. Additionally, port and starboard quadrants are connected by cross-over valves. With the correct alignment, this allows fuel to be pumped 4-9







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