TM 55-1925-284-14&P
0004 00
Table 5. MSD Valves, AMS 1 (Refer to figure 5)
Key
Control/Indicator
Function
1
CA-80 COV-LP AIR
This valve secures the ship's service low pressure air
shutoff.
2
SD-3 SEWAGE DRAIN
This valve allows sewage to go directly to the sewage
TO HOLDING TANK
holding tank when OPENED.
3
PW-100 POTW ISOLATION
OPEN this valve to allow potable water to the MSD
potable water fill valve.
4
SD-2 SEWAGE OVERBOARD
OPEN this valve to allow sewage to the overboard discharge.
DISCHARGE
5
SD-13 SEWAGE OVERBOARD
This valve, when OPENED, allows sewage to be
DISCHARGE
discharged overboard.
6
CA-81 LP AIR SHUTOFF
This valve, when CLOSED, stops the ship's service
compressed air from entering the MSD system.
7
MSD-3 POTW FILL TO MSD ISLN
This valve, when OPENED, permits potable water to fill the
media tank.
8
SD-1 SEWAGE INLET TO MSD
This valve, when OPENED, permits sewage to enter the
MSD.
9
MSD-6 BLOWER DISCH TO AIR
OPEN this valve to air scour the MSD media tank.
SCOURING SOV
10
MSD-8 MEDIA TANK PUMP-OUT
OPEN this valve to pump out the MSD media tank.
DR
11
MSD-9 MEDIA TANK DRAIN
OPEN this valve to drain the media tank to the sewage
holding tank.
12
MSD-10 WET WELL DISCHARGE
OPEN this valve to allow effluent to the MSD discharge
pump.
13
MSD-11 WET WELL SAMPLE
This valve, when OPENED, permits samples to be taken
from the wet well.
14
MSD-5 BLOWER
This valve, when CLOSED, isolates the blower from the
DISCHARGE SHUTOFF
media tank.
15
CA-83 PRV SET AT 2 PSIG
This valve regulates the amount of air pressure entering
the media tank from the ship's service low pressure air.
16
CA-82 LP AIR HOSE SHUTOFF
This valve, when CLOSED, isolates the ship's service low
pressure air.
0004 00-6
