Open valve SW37 in void 4 port.
Open valves SW45 and SW46 to activate strainer pressure gauges (Barges 2 and 3 only).
Open valve SW49 near void 4 starboard shell overboard discharge.
Open seawater valves for generators to be used as follows:
SSG 1: SW38, SW39
SSG 2: SW40, SW41
SAG (20 kW): SW42, SW43
Coolant pumps on generator engines move seawater from seachest through the
engine coolant exchange tanks. The used seawater is discharged directly
overboard through seawater valve SW49.
While operating, perform during operation checks in steps i thru I in paragraph 11-12.1.1 and step h below.
While supplying seawater for generator cooling, perform the following:
Check for normal operation and leaks.
Watch generator cooling strainer input and output pressure gauges:
A pressure difference between the two gauges of 2-4 inches is normal.
if the pressure difference between the two gauges reaches 8 inches, turn handle on generator cooling
strainer to move water through dean basket.
Remove and dean dogged basket. (See seawater strainer placard.)
When regulator outlet pressure gauge drops from 10 psi to 8 psi, replace in-line filter (TM 55-1930-209-14 &
11-12.8 Seachest blowdown. Seachest blowdown is needed when gauges on input side of seawater strainers indicate
a significant drop in water pressure. Blockage should be eliminated by using the following procedures. If compressed air
is not available, start and operate the compressed air system according to Chapter 12.
11-12.8.1 Forward seachest blowdown (serving ROWPU, chlorination, air conditioning, and ballast seawater system).
Before starting forward seachest blowdown, make sure seawater cooling water
pumps are not In use.
Isolate seachest by dosing valves SW1 and SW2. Make sure cooling pump is off and dose SW3.
Check that compressed air pressure regulator 1 is set to 40 psi as shown on regulator gauge.
Blowdown seachest on Barge 1 as follows:
Position valve SW30 to position B so compressed air flows into seawater seachest.
When air pressure regulator gauge reading stabilizes at 3 - 5 psi, position valve SW30 to position A to allow
seachest to vent.
Proceed to step e.