receiving ship. PWC, however, will normally
The aeration system should remain in
provide the hoses. All ships in the nest must be
notified before pumping. There will not be any
high-level alarm conditions set on the inboard ships.
3. When the discharge pump loses suction,
place the controller selector switch in the
When leaving a nest, the ship follows basically
the same procedures as leaving the pier. However,
if your ship is inboard, all the ships outboard of
4. Close the pump discharge valves (B).
yours must stop pumping and shift to the transit
mode also. Once your ship has broken away, the
5. Open the flushing/eductor supply valve (E)
other ships can commence reconnecting and shifting
and flush the discharge piping and hose for
to the in-port mode.
SAFETY PRECAUTIONS FOR IN-PORT
6. Close the flushing/eductor valve (E).
MODE.-- The following precautions are applicable to
7. Open the pump discharge valves (B).
operation in the in-port mode:
8. Operate the manual hold-open device on
--In the event of a high-level alarm, you, as the
the pump discharge check valves (K) to
operator, should recognize that a problem exists
drain the discharge lines back into the tank.
with the pumps, the discharge piping, or both. If
t h e tank completely fills while the system
9. Try raising the hose to remove fluid from
malfunction is being checked out, the waste will
the drooping portion.
overflow overboard and flow through any heads or
fixtures located below the overflow discharge lines.
10. Close the deck discharge valve (F) and the
These fixtures should be identified and marked
receiving station valve.
before initial use of the system.
11. Break the highest hose connection first to
-- W h e n e v e r a high-level alarm sounds,
ensure proper drainage of the hose. This
immediately close the isolation valves on the marked
allows air into the line and breaks any
drains below the overflow overboard discharge
vacuum or pressure seal.
and/or divert the upper deck drains overboard to
NOTE: Personnel engaged in sewage
transfer hose operations must observe all
--In the event of leakage or snagging of the
applicable safety, sanitary, and hygienic
transfer hoses, close valve (F) (see figs. 17-1 and
17-3) at the deck connection. (Closing the pier
valve may cause the discharge hose to rupture.) Line
12. Cap or seal the ends of the transfer hose.
up the pump discharge diverter valve (C) in the
overboard discharge position to prevent overflow or
13. Reset (close) the pump discharge check
backup of drains located below the tank overflow.
Once the problem has been corrected, return the
system to the operational alignment.
14. Wash down the deck connection area with a
solution of hot water, stock detergents, and
PROCEDURES FOR GETTING
UNDERWAY.-- When in the in-port mode, follow
the following procedures to prepare the CHT system
15. Close the pump discharge valves (B).
for getting underway (see figs. 17-1 and 17-3).
The ship should now be prepared for transit.
1. Set the waste drain diverter valve (J) to the
Follow the procedures listed in the SDOSS to switch
overboard discharge position.
the system from the in-port mode to the transit
mode and then to the at-sea mode. This operation
2. Set the sewage discharge pump controller
is basically just the opposite of going from the at-sea
switch to MAN 1 for emptying the tank.
mode and working down to the in-port mode.