ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0002 00
DESCRIPTION AND THEORY OF OPERATION
EQUIPMENT DESCRIPTION AND DATA
Chemical Injection System
The chemical injection system is composed of three independent chemical systems: the sodium bisulfite,
antiscalant, and calcium hypochlorite chemical injection systems.
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 in the product water.
Each of the three chemical systems consists of the following components (see Figure 24):
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 (see Figure 25)
An eye wash station is located in the operator station just above the chemical pumps (see Figure 24).
EYE WASH STATION
DISCHARGE TO INJECTION POINT
FOUR-FUNCTION VALVE
SPEED CONTROL DIAL
CP-3 HYPOCHLORITE PUMP
STROKE CONTROL DIAL
RETURN/PRIMING TUBING
CP-1 BISULFITE PUMP
CP-2 ANTI-SCALANT PUMP
SUCTION TUBING
SUCTION TUBING
COLOR-CODED COVER
RETURN/PRIMING
TUBING
CERAMIC
WEIGHT
5-GALLON BUCKET
FOOT VALVE
STRAINER
Figure 24. Chemical Injection System Components.
0002 00-23
