ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
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DESCRIPTION AND THEORY OF OPERATION
THEORY OF OPERATION
CHEMICAL INJECTION SYSTEM
The chemical injection system is composed of three independent chemical systems: the sodium bisulfite
chemical injection system, the antiscalant chemical injection system, and the calcium hypochlorite
chemical injection system.
The sodium bisulfite chemical injection system is used only if the raw water source is chlorinated water.
Chlorinated water will rapidly destroy the fibers in the micro-filter elements and the membranes in the
reverse osmosis elements. Sodium bisulfite is injected into chlorinated raw water before the water is
discharged into the MF Feed Tank to neutralize the chlorine.
The antiscalant chemical injection system inhibits salt scale formation on the RO membranes.
The calcium hypochlorite chemical injection system prevents microbial growth and contamination in the
product water.
Each of the three chemical systems consists of (see Figure 23):
Chemical Injection Pump CP-1, CP-2, or CP-3
Four Function Valve V-612, V-622, or V-632
Refillable five gallon bucket to hold the chemical solution
Foot Valve (V-611, V-621, or V-631), strainer, and ceramic weight
3/8 in. suction tubing
3/8 in. discharge tubing
1/4 in. return/priming tubing.
Injection Check Valve V-613, V-623, or V-633
FOUR-FUNCTION VALVE
SPEED CONTROL DIAL
MF BASKET
STRAINER S-2
STROKE CONTROL DIAL
CP-3 HYPOCHLORITE PUMP
CP-1 BISULFITE PUMP
CP-2 ANTI-SCALANT PUMP
DISCHARGE TUBING (TO INJECTION POINT)
SUCTION TUBING
RETURN/PRIMING TUBING
CERAMIC WEIGHT
FOOT VALVE
STRAINER
5-GALLON BUCKET
Figure 23. Chemical Injection System Components.
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