TM 55-1925-284-14&P
OPERATOR MAINTENANCE
MARINE SANITATION DEVICE FOR
INLAND AND COASTAL LARGE TUG (LT)
WET WELL, REPAIR
INITIAL SETUP:
References:
Tools and Special Tools:
FM 55-502
Tool Kit, General Mechanic's (Item 1, Table 2,
TM 55-1925-273-10
Materials/Parts:
Gloves, Chemical and Oil Protective (Item 1,
Goggles, Industrial (Item 2, Table 3,
Equipment Conditions:
Set to OFF the MSD DISCHARGE PUMP AND
BLOWER circuit breaker in 440V power panel
Indicator, Sight, Liquid (Item 2, Figure 6,
No. 4. Lock out and tag out (FM 55-502).
All ventilation fans operating normally (TM 55-1925-
273-10)
Personnel Required:
Two Watercraft Engineers, 88L
SIGHT GLASS REPLACEMENT
REMOVAL
1. CLOSE the SEWAGE INLET TO MSD valve, SD-1 (figure 1, item 1).
2. OPEN the SEWAGE DRAIN TO HOLDING TANK valve SD-3 (figure 1, item 2).
3. CLOSE the WET WELL DISCHARGE valve, MSD-10 (figure 1, item 3).
NOTE
Ensure that the sewage holding tank has adequate capacity to hold the effluent from the
wet well before proceeding with this procedure. If the sewage holding tank is full, dis-
charge the effluent to a proper shore based facility prior to continuing with this proce-
dure.
4. OPEN the WET WELL DRAIN TO HOLDING TANK valve, MSD-13 (figure 1, item 4) and drain the wet well
into the SEWAGE HOLDING TANK (figure 1, item 5).
5. CLOSE the sight glass (liquid sight indicator) inlet valve (figure 2, item 1) and the sight glass outlet valve
(figure 2, item 2) on the affected sight glass (figure 2, item 3).
6. Remove the rods (figure 2, item 4) that hold the sight glass assembly (figure 2, item 5) together.
0019 00-1