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 TM 55-1925-273-10-1
0067 00
SEWAGE COLLECTION, HOLDING AND TRANSFER (CHT) SYSTEM
The CHT system has the following modes of operation:
a.
Directly Overboard
b.
Through the Marine Sanitation Device (MSD) to Overboard
c.
To the Sewage Holding Tank
Directly Overboard
1.
To direct sewage drains directly overboard, close SD-3 (sewage drain to holding tank) and SD-1 (sewage inlet
to MSD) and open valves SD-2 and SD-13 (sewage overboard discharging).
Through the Marine Sanitation Device (MSD) to Overboard
1.
To direct sewage drains to the MSD, close valves SD-3 (sewage drain to holding tank) and SD-2 and SD-13
(sewage overboard discharge) and open SD-1 (sewage inlet to MSD).
2.
See MSD operating instruction for MSD discharge overboard.
To the Sewage Holding Tank
1.
To direct sewage drains to the sewage holding tank for eventual discharge overboard or to shore connections
close valves SD-1 (sewage inlet to MSD) SD-2 and SD-13 (sewage overboard discharge) and open valve SD-
3 (sewage drain to holding tank).
Note: The tank level indicating system will sound an alarm when tank is at the 95% full condition.
2.
To discharge sewage from holding tank to overboard, align system by opening valves as follows:
#1 Sewage Discharge Pump: SD-5, SD-7, SD-8 and SD-13
#2 Sewage Discharge Pump: SD-4, SD-6, SD-8 and SD-13
Note: When discharging sewage overboard from holding tank, pumping may be enhanced by leading plumbing
drains to the holding tank for dilution of sewage.
3.
Ensure power is available to #1 and #2 sewage discharge pump motor controllers.
4.
Start either pump by depressing start button and observe pump discharge pressure gage and local tank level
indicator meter.
5.
To secure pump, depress stop button on motor controller.
6.
To discharge sewage from holding tank to Port or Stbd shore connection align system by opening valves as
follows:
#1 Sewage Discharge Pump to Port Conn.: SD-5, SD-7 and SD-10
#1 Sewage Discharge Pump to Stbd Conn.: SD-5, SD-7 and SD-11
#2 Sewage Discharge Pump to Port Conn.: SD-4, SD-6 and SD-10
#2 Sewage Discharge Pump to Stbd Conn.: SD-4, SD-6 and SD-11
7.
Ensure that shore connection chosen is properly connected to a suitable collection tank.
8.
Follow steps 3 -5 above for start/stop of discharge pumps.
Placard 10. Sewage Collection, Holding, and Transfer (CHT) System
0067 00-15
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