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 TM 55-1925-273-10-1
0045 00
Table 22. MSD (refer to figure 22)
Key
Control/Indicator
Function
1
CA-80, COV-LP AIR
This valve secures the ship's service low pressure airshutoff.
2
SD-3, SEWAGE DRAIN
This valve allows sewage to go directly to the sewage holding tank when
TO HOLDING TANK
OPENED.
3
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 discharged overboard.
DISCHARGE
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
This valve, when OPENED, permits potable water to fill the media tank.
ISLN
8
SD-1, SEWAGE INLET TO MSD
This valve, when OPENED, permits sewage to enter the MSD.
9
MSD-6, BLOWER DISCH TO
OPEN this valve to air scour the MSD media tank.
AIR SCOURING SOV
10
MSD-8, MEDIA TANK
OPEN this valve to pump out the MSD media tank.
PUMP-OUT 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
OPEN this valve to allow effluent to the MSD discharge pump.
DISCHARGE
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 media tank.
DISCHARGE SHUTOFF
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.
END OF WORK PACKAGE
00450045 00-31
00-31/32 blank
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