TM 55-1930-209-14&P-1
CHAPTER 11 SEAWATER SYSTEM
Section I. General
11-1 General. Seawater system supplies seawater to the ROWPU's for processing, to the air conditioning unit for
cooling, to the ballast tank for barge trimming, to the chlorination unit for priming and cooling, and to the diesel generators
for cooling.
11-2 Description
11-2.1 ROWPU and ballast seawater supply. This installation (Figure 11-1) consists of a forward seachest, two
seawater strainers with pressure gauges, two seawater filters, two seawater pumps, ballast tank and associated piping,
valves, and electrical circuitry. This arrangement supplies seawater to the ROWPU's for processing, to the ballast system
for trimming, and to the chlorination unit. Information about major components is listed in Table 11-1. A block diagram is
shown in Figure 11-2 Equipment specifications maintenance information and manufacturer's service manuals are
contained In TM 55-1930-209-14&P-2.
11-2.2 Air conditioner cooling seawater and chlorination unit supply. This installation (Figure 11-3) consists of a
seawater strainer with gauges, seawater filter, pressure regulator with gauge, cooling pump and associated piping, valves,
and electrical circuitry. When seawater pumps are not operating, this arrangement can supply seawater to the air
conditioning unit for cooling and to the chlorination unit for cooling and producing chlorine. Information about major
components is listed in Table 11-2. A block diagram is shown in Figure 11-4.
11-2.3 Diesel engine generator seawater cooling. This installation (Figure 11-5) consists of an aft seachest, a
seawater strainer, temperature gauges (on each generator set), associated piping, valves, and electrical circuitry. This
arrangement supplies cooling seawater to diesel engine generator sets. Information about major components is in Table
11-3 Block diagrams are shown in Figures 11-6 and 11-7.
11-3 Seawater supply. The three seawater supply sources are: a forward seachest in void 2 starboard, a shell
penetration in void 2 starboard, and an aft seachest in void 4 port. Seachest in void 2 starboard supplies sufficient
seawater to ROWPU's for processing when barge is anchored in 15 or more feet of water. When anchored in 15 feet of
water but not less than 10 feet, starboard shell intake can supply sufficient seawater to ROWPU's for processing. At all
times, when barge is anchored or pierside, seachest in void 2 starboard can be used to supply seawater to the air
conditioner and to the chlorination unit. The seachest In void 4 port also can be used to supply seawater for cooling the
diesel generators whether the barge is anchored or pierside.
11-4 Special limitations. Seawater system should not be operated in rough sea conditions exceeding Sea State 3.
ROWPU feedwater must be kept free of chlorine, detergents, oil, and other contaminants. Water must be deep enough to
ensure sand and other foreign matter are not taken into the system with the seawater.
11-1
