CHAPTER 2 DESCRIPTION OF OPERATION
2-1 ROWPU seawater supply. When barge is deployed in deep water (15 feet or more), seawater is obtained from the
void 2 starboard seachest When barge is deployed in shallow water (less than 15 but more than 10 feet), seawater is
taken in through the void 2 starboard shell penetration. The seawater pumps draw the seawater through a strainer to
remove foreign matter, and discharge the water through a seawater filter where additional foreign matter is removed. This
filtered water then flows to the ROWPU's for processing.
2-2 Ballast seawater supply. Ballast seawater is used for altering the trim of the barge before discharging drinking
water to shore or before towing. When barge is to be trimmed, seawater is drawn from void 2 starboard seachest or void
2 starboard shell penetration by seawater pump(s) and discharged into the ballast tank until desired trim is established.
When ballast tank is to be drained, seawater is drawn from the tank by seawater pump(s) and discharged directly
overboard through the overboard discharge in void 2 starboard.
2-3 Air conditioning unit seawater supply. When air conditioning unit is operating, a cooling pump draws seawater,
through a strainer, from void 2 starboard seachest. Seawater is then discharged to air conditioning unit to cool the unit.
After circulating through unit, the heated seawater is discharged directly overboard through overboard discharge in void 1
2-4 Chlorination unit seawater supply. When ROWPU's are operating, seawater pumps supply strained seawater to
the chlorinnation unit. When ROWPU's are not operating, strained seawater is supplied by the cooling pump. This
seawater is used for priming the chlorination unit, for producing sodium hypochlorite, and for cooling. After circulating
through the unit, the heated seawater is discharged directly overboard through the overboard discharge in void 1 port.
2-5 Diesel generators seawater supply. When any of the three diesel generators in voids 4 port and starboard are
operating, cooling seawater is obtained from seachest in void 4 port. Seawater is drawn by a generator internal cooling
pump through the generator cooling strainer before entering the pump. After circulating through the generators, the
heated seawater is discharged directly through the overboard discharge in void 4 starboard