CHAPTER 2 DESCRIPTION OF OPERATION
2-1 General. This system provides diesel fuel, when required, from the day tank via hard piping to service diesel
generators, auxiliary generator, ROWPU diesel HP pumps and the workboat fueling station.
2-1.1 Storage tanks. The main fuel storage tanks are filled through the fill station (Figure 1-2). When the tanks are
being filled, Equipment Monitoring System (EMS) displays the fuel oil tank levels on the video monitor. This system also
triggers visual and audible alarms to indicate that fuel tanks are full and filling operation must be stopped.
2-1.2 Day tank. When day tank's level indicator shows that it requires fuel, transfer fuel from the fuel oil storage tanks.
Operate the fuel oil transfer pump to move fuel from storage tanks and discharge it into the day tank. When day tank is
nearly full, stop the pump. If pump is not stopped manually, a high level switch cuts off electrical power to pump. An
overfill line provides a return to storage tanks in case cutoff switch malfunctions.
2-1.3 Draining tanks. When day tank must be emptied, drain back to storage tank by opening drain valves on the
bottom of day tank. Day tank can also be drained to outside facilities by connecting appropriate hose to the drain valve
located below the day tank and then opening the drain valve. Storage tanks can be emptied by pumping fuel off barge
after making appropriate connections to the off-barge receiving container, operating the necessary valves, and activating
the fuel oil transfer pump. Fuel also can be transferred from one storage tank to another by using fuel oil transfer pump.
In this operation, the day tank may be bypassed. Storage tanks can also be drained directly to the sludge tank using the
bilge pump. See TM 55-1930-209-14&P-15 for use of bilge system.
2-1.4 Workboat fueling. Fuel oil is provided to the workboat via the workboat fuel oil filling station located on
deckhouse starboard side. In this operation, fuel Is transferred from day tank to workboat filling station, and through a
hose with a nozzle to the workboat fuel tank.