ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0017 00
OPERATOR INSTRUCTIONS
STANDBY OR SHORT-TERM SHUTDOWN OPERATION UNDER
USUAL CONDITIONS
SHORT TERM SHUTDOWN - NORMAL OPERATION
This procedure applies to any shutdown anticipated to be over 4 hours but less than 54 hours.
1. Shutdown to Standby as follows:
a. Fully OPEN Main Pressure Control Valve HCV-401 and then Auxiliary Pressure Control
Valve HCV-401A (see Figure 1 for valve location).
b. Turn the SYSTEM MODE SWITCH to STANDBY. The PLC automatically performs the
following actions:
1) HP pumps are stopped.
2) MF feed pump is stopped.
3) Automatic valves are cycled to the standby position.
4) RO feed pump remains ON to flush the RO membranes until the RO feed tank
empties. The low level alarm will sound when the tank is empty and the pump
will stop.
c. Stop Motor-Driven Raw Water Pump P-2 if in use.
d. Close Raw Water Flow Control Valve V-107 (see Figure 1 for valve location).
e. Open RO Feed Tank Drain Valve V-412 after the RO feed pump shuts off (see Figure 4
for valve location). Close the valve when the tank is drained.
f. Stop Diesel Engine-Driven Raw Water Pump P-1 if in use as described in Raw Water
Diesel Engine Shutdown at then end of this work package.
RO FEED TANK DRAIN VALVE V-412
Figure 4. RO Feed Tank Drain Valve V-412.
2. Backwash the MF with product water as follows:
a. Drain the MF Feed Tank. Disconnect the MF feed pump suction hose from the tank and
lift the MF feed tank to drain as much remaining water as possible.
b. Reconnect the MF feed pump suction hose to the tank.
WARNING
Chemical dust. Wear the protective face shield, chemical gloves, and a dust mask when
handling sodium bisulfite. Avoid inhaling chemical dust or fumes. Failure to observe this
warning may result in mild irritation of the nose, throat, eyes, and skin.
Failure to add sodium bisulfite to the chlorinated product water that is used for flushing
will result in MF membrane failure.
0017 00-7
