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 TM 55-1905-223-10
m
seawater for cooling and air conditioning units AC-1, AC-2, and AC-3. Seawater is also provided to the port
and starboard stern tubes for lubrication, cooling, and flushing and to the marine sanitation device. System
control is maintained through a combination of valves as shown in FIGURE 1-42. The system consists of the
auxiliary seawater cooling pump and a duplex strainer in the piping B drawing seawater from the sea chest.
The seawater regulating valves located in the emergency generator room provide a constant air conditioner
condenser cooling water pressure. The seawater cooling pump receives power through the auxiliary machinery
motor control center with a RUN indicator lamp on the EOS.
1-34. Main Engine Fresh Water Cooling Piping Systemhe main engine fresh water cooling piping system
.T
extracts heat from the main engines by pumping fresh water through the engines. System control is maintained
through a combination of valves as shown in FIGURE 1-43. The main engine fresh water cooling piping system
receives fresh water from the potable water piping system. Fresh water is drawn from the expansion tanks into
the engine cooling system by engine water pumps, pumped through the engine, and discharged through an
external cooling system. The external cooling system cools the discharged fresh water by circulating the water
through external grid (keel) coolers. The keel coolers are located outside the ship's hull.
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water cooling piping system extracts heat from the SSDG by pumping fresh water through the generators.
System control is maintained through a combination of valves as shown in FIGURE 1-44. The SSDG fresh
water cooling piping system receives fresh water from the potable water piping system. Fresh water is drawn
into the engine cooling system by engine water pumps, pumped through the engine, and discharged through an
external grid (keel) cooling system. The keel coolers are located under the ship's hull. During beaching
conditions, when the external keel coolers may be out of the water, coolers located in seawater ballast tanks
(SW-8P and SW-8S) may be selected with valve alignment, for continued SSDG fresh water cooling.
1-36. Reduction Gear Lubricating Oil Fresh Water Cooling Piping Syst.emhe reduction gear lubricating
T
oil fresh water cooling piping system cools the reduction gear lubricating oil by fresh water circulated through
external keel coolers. Fresh water is supplied to the reduction gear lubricating oil fresh water cooling piping
system by the potable water piping system. Fresh water circulation, under pressure, is provided by reduction
gear cooling water pumps No. 1 (starboard) and No. 2 (port). Power for each pump is supplied through circuit
breakers on the auxiliary machinery motor control center with pushbutton START and STOP controls adjacent
to each pump. A pump running indicator lamp is located on the engine room operating station console. System
control for both reduction gears is maintained through a combination of valves as shown in FIGURE 1-45.
1-134
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