ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0057 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
CHEMICAL INJECTION SYSTEM
Replace any one or all three of the TWPS chemical injection pumps as follows (see Figure 1):
INJECTION CHECK VALVE
COUPLING NUT
DISCHARGE TUBING
FOUR-FUNCTION
SPACER, ELECTROMAGNETIC POWER UNIT (E.P.U.)
VALVE
RETURN TUBING
SPEED KNOB
(PRESSURE RELIEF)
STROKE KNOB
PUMP HEAD
METERING PUMP
SUCTION FITTINGS
HOUSING
SUCTION TUBING
WEIGHT
POWER CORD
FOOT VALVE
Figure 1. Chemical Injection Pump.
1. Depressurize the chemical injection pump discharge tubing as follows:
WARNING
Hazardous liquid chemical or fumes. Wear a protective face shield and chemical
gloves when handling liquid sodium bisulfite, antiscalant, or calcium hypochlorite
solutions. Avoid inhaling chemical fumes. Failure to observe this warning may
result in gastrointestinal irritation, nausea, diarrhea, irritation of the nose, throat,
mucous membranes, eyes, and skin. Ingestion of calcium hypochlorite can be
fatal. Calcium hypochlorite can cause blindness if it comes in contact with the
eyes.
a. Turn the relief knob (black knob) turn either direction and pull out the anti-siphon knob
(yellow knob) and hold it out for 5-10 seconds (see Figure 2).
b. The discharge tubing is now depressurized.
0057 00-2
