ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
CHEMICAL INJECTION SYSTEM
4. Install the new chemical injection pump onto the TWPS as follows (see Figure 3):
NOTE
All new Chemical Injection Pumps are pre-primed with water when shipped from
the factory. Before priming the pump, drain the water from the pump and refill the
pump head with the solution to be pumped. This will aid in priming.
a. Slide the new Chemical Injection Pump onto its mounting on the TWPS and secure it with
the four bolts, nuts and washers.
CAUTION
All fittings should be hand-tightened. It may be necessary to turn the fitting an
additional 1/ 8 1/4 turn after the fitting contacts the seal ring to provide a leak-
proof seal. Excessive over-tightening or using a pipe wrench can cause damage to
the fittings, seals, or pump head.
b. Connect the return tubing to the four-function valve.
c. Connect the suction tubing to the suction side of the pump.
d. Connect the discharge tubing to the discharge side of the four-function valve.
WARNING
Electrical hazard. The TWPS unit must be properly de-energized before opening
the terminal box for the chemical injection pumps. Failure to observe this warning
may result in injury or death from electrocution.
NOTE
Each chemical pump power cable has a dedicated circuit that is controlled by the
PLC (Programmable Logic Controller) in the PDP. Each pump power cable must
be wired to it's specific circuit in order for the pump to operate as controlled by the
PLC. Do not mix the wiring.
e. Cut the plug off the end of the new pump power cable and strip about 1-in of insulation off
each of the 3 wires.
f. Slide the cable strain relief and washer over the power cable wires for the new pump.
g. Slide the power cable wires through the terminal box opening and fit the strain relief into
the opening.
h. Slide the lock nut over the wires, thread it onto the strain relief, and tighten.
i. Connect the chemical pump wires to the wires inside the terminal box as tagged using
conductor splices.
j. Secure the wires together using an electrical tie-down strap.
k. Make sure the terminal box cover gasket is in place in the cover.
l. Secure the cover to the box using the four screws.
5. Start up the TWPS from Stand-by Shutdown (WP 0015).
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