3. Energize the high-level alarm circuit at the f. For strainer-type systems, the inflow
IC switchboard to continuously monitor the tank stop valves (G) should be open.
level.
4. Call main control and request that the CHT
4. Secure both the air blower and the pump-room power panels be energized.
comminutor power supply switches at the local
power panel.
5. Check the comminutor belt tension.
During the at-sea mode, you must flush the 6. For comminutor-type systems, once the
holding tank for 30 minutes each week, and pump power panels are energized, open the comminutor
it down even when the tank is not in use. Keep the isolation valves (D) and start up the comminutor.
pump rooms clean and dry. Make sure that the Observe the comminutor to ensure that it is
pump-room sumps are clean and pumped down. operating properly.
De-energize the pump-room power panels at the
main switchboards. 7. Notify DC central (or main control) that the
CHT system is ready to be shifted to the transit
Transit Mode mode.
The OOD should inform the engineer officer 1 The engineering officer of the watch (EOOW)
hour before the ship enters restricted waters. will report to the OOD that the CHT system is
(Restricted waters are the waters within 3 miles of ready to be shifted.
land.) The engineer officer will then have personnel
in charge of the CHT system start switching the When the ship is 4 miles out from land, the
system over from the at-sea mode to the transit OOD will direct the EOOW to have the CHT
mode. system shifted. The EOOW will, in turn, direct the
CHT personnel to make the shift. The EOOW will
To change the system over to the transit mode, also inform DC central when the shift is to be
follow these preliminary procedures first: made.
1. Make sure the tanks are pumped down. When you are notified to shift the CHT system
to the transit mode, follow these procedures:
2. Check the pump-room power panels to
ensure that all switches are in the OFF position, 1. Shift the soil drain diverter valves (H) to the
including the pump selector switches. CHT collection position.
3. Verify that these valves are in their proper 2. Check the waste drain diverter valves (J) to
positions: ensure that they are still in the overboard position.
a. The pump suction valves (A) should be 3. Inform DC central that the system is in the
open. transit mode.
b. The pump discharge valves (B) should DC central will then inform the EOOW that the
be closed. switch has been completed. DC central will then
update the valve positions on the valve status board.
c. The tank washdown supply valve (L)
should be closed. When the ship is going into anchorage,
arrangements for a sewage barge will be required.
d. The air blower discharge valve (M) The sewage barge is normally furnished by the host
should be open. activity or by a civilian contract.
e. The ship’s service air supply valves (N) In-Port Mode
should be open.
While the ship is entering port, the CHT system
stays in the transit mode. Once the ship moors to
17-12
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