b To obtain seawater from seawater pump(s) for chlorination and/or air conditioning units, open:
Valve SW24 in void 2 port for seawater pump 1,
Valve SW25 in void 2 port for seawater pump 2,
Valves SW24 and SW25 for both seawater pumps.
Open valve SW48 in void 2 port.
If seawater required for chlorination unit only, dose valve SW47 in void 2 port.
If seawater required for both chlorination and air conditioning units, open valves SW47 and SW28 (Barges 2 and
3 only) in void 2 port. Make sure valve SW27 in void 2 port is dosed.
If seawater required for air conditioning unit only, open valves SW47 and SW28 (Barges 2 and 3 only). Cooling
seawater will be supplied to air conditioner as well as to chlorination unit, but cooling water in chlorination unit will
simply circulate through cooling portion of unit and pass overboard through port discharge.
While system is operating, perform during operation checks in steps i thru m in paragraph 11-12.1.1.
11-12.4 Supplying seawater from cooling pump to air conditioning and chlorination units
See Figures 11-3 and 11-4 for seawater valve locations.
Perform prestart operation checks in paragraph 11-11.
Close seawater valve SW48 to turn off seawater from nonoperating seawater pumps in void 2 starboard.
Open seawater valves SW3 and SW27 in void 2 port to supply seawater to cooling pump.
Open seawater valves SW35 and SW36 in void 2 port to monitor pressure differences between input and output
of seawater strainer 3 supplying seawater to cooling pump.
To supply seawater to chlorination unit and air conditioner, open seawater valves SW28 (Barges 2 and 3 only)
To supply seawater to air conditioner only, open seawater valve SW28 (Barges 2 and 3 only) and dose SW47.
To supply seawater to chlorination only, open seawater valve SW47 and dose SW28 (Barges 2 and 3 only).
Set seawater pressure regulator to supply 10 psi of seawater to chlorination unit.
Start cooling pump by pressing START button on cooling pump motor controller on center bulkhead in void 2 port.
While operating, perform during operation checks in steps i thru I in paragraph 11-12.1.1.
k. While supplying seawater to air conditioning unit and/or chlorination system using cooling pump, perform the following:
Check for normal operation and leaks.
Check cooling water strainer input and output pressure gauges.
A pressure difference of 1 inch between the two reading gauges is normal.
If the pressure difference between the two gauges reaches 2 inches, turn handle on cooling water
strainer to move water through dean basket.
Remove and clean dirty basket (see seawater strainer placard).