TM 55-1925-284-14&P
0019 00
MARINE SANITATION DEVICE SYSTEM
VENT
VENT
VENT
VENT
VENT
VENT
VENT
VENT
02 LEVEL
STBD PORT
SHORE SHORE
CONN CONN
01 LEVEL
SD-11 SD-10
MAIN DECK
AUX
ENGINE
MCHRY SP
ROOM
AUX
CA-84
NO. 1
MCHRY SP
SD-13
2
SD-2
NO. 1
P
SET AT
0-15
OVBD
SD-3
3 PSIG
PSIG
P
FROM
0-30
COMP AIR
CA-83
PSIG
CA-80
CA-81
BLOWER
FROM
SET AT
CA-82
POTABLE
2 PSI
PW-100
WATER
1
MSD-5
SD-9
MSD-3
6
MSD-6
SD-1
SEWAGE INLET
P
CHLORINATOR
0-60
P
PSIG
0-60
EFFLUENT
PSIG
MARINE
WET
SANITATION
AIR SCOUR
SD-7
SD-19
P
WELL
MSD-14
SD-8
MSD-11
MSD-8
B MSD-10
DEVICE
0-60
DISCHARGE
PSIG
SD-12
NO. 1 SEWAGE
MSD-9
MSD
SD-20
DISCH PUMP
DRAIN
DISCH
AUX
ENGINE
PUMP
PD-4
MCHRY
ROOM
SD-5
FROM WWTR SYS
SP NO. 1
MSD-13
SD-4
SEWAGE HOLDING TANK
NO. 2 SEWAGE
SD-6
DISCH PUMP
4
3
5
Figure 1. MSD Piping and Valve Schematic
7. Unscrew the collars (figure 2, item 6) from the inlet valve (figure 2, item 1) and the outlet valve (figure 2, item 2).
8. Slide the sight glass (figure 2, item 7) up into the outlet valve (figure 2, item 2) and then down and out to
remove it.
9. Remove the O-rings (figure 2, item 8) from the inlet valve (figure 2, item 1) and the outlet valve (figure 2, item 2).
Discard the O-rings.
10. Unscrew the inlet valve (figure 2, item 1) and the outlet valve (figure 2, item 2) from the wet well (figure 2, item 9).
0019 00-2
