Blowdown seachest on Barges 2 and 3 as follows:
Close valve SW30 (in workshop).
Open compressed air seawater seachest blowdown valve (in workshop).
When air pressure regulator gauge reading stabilizes at 3-5 psi, dose compressed air seawater seachest
valve SW30 to vent seachest.
Do not open seachest valves SW1, SW2, or SW3 unless valve SW30 is positioned
to allow seachest to vent.
To return seachest to normal operation, open valves SW1, SW2, and SW3 and turn on cooling pump and
seawater pumps as needed.
If sea strainer inlet gauges do not indicate near normal reading, repeat steps a thru c.
11-12.8.2 Aft seachest blowdown (serving generator cooling seawater system)
Before starting aft seachest blowdown, make sure generator sets are not
Isolate generator cooling seawater seachest by dosing seawater valve SW37. Make sure all generators are shut
down and not pulling seawater from seachest.
Check that compressed air pressure regulator 2 is set to 40 psi as shown on regulator gauge.
Close seawater valve SW44.
Open generator cooling seachest blowdown valve in aft port comer of ROWPU space.
When air pressure regulator gauge reading stabilizes at 3-5 psi, open valve SW44 to vent seachest.
Close generator cooling seachest blowdown valve.
Do not open seachest valve SW37 unless valve SW44 is open.
To return seachest to normal operation, open valves SW37 and SW49. Start at least one of the generators and
check sea strainer inlet gauges.
If sea strainer inlet gauges do not indicate near normal reading, repeat steps a thru g above.
Return seachest to operation by opening valves SW37 and SW49, and starting at least one generator.
11-13 Seawater system shutdown procedures
Shutdown procedures for ballasting are incorporated in paragraphs 11-12.5 and 11-12.6.
Shutdown procedures when supplying seawater to ROWPU's using seawater pump(s) 1 and/or 2 are in
Shutdown procedures when supplying seawater for generator cooling are in paragraph 11-13.2.
Shutdown procedures when supplying seawater to air conditioning and chlorination units using cooling pump are
in paragraph 11-13.3.