ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0003 00
DESCRIPTION AND THEORY OF OPERATION
THEORY OF OPERATION
The refillable five-gallon buckets have a different color cover for each of the three chemical systems to
help ensure that the right chemical is used with the right system,
1. Sodium bisulfite chemical injection system has a refillable five gallon bucket with BLUE COVER
2. Antiscalant chemical injection system has a refillable five gallon bucket with YELLOW COVER
3. Calcium Hypochlorite chemical injection system; refillable five gallon bucket with RED COVER
The three chemical pumps are mounted next to the MF Basket Strainer S-2. The operation of all three
pumps is the same. Only the type of chemical pumped, rate of injection and location of injection differs.
The sodium bisulfite and antiscalant pumps are set to pump approximately 4 gallons every 10 hours of
operation. This allows refilling of these chemical buckets at the beginning of each shift. The calcium
hypochlorite pump is set according to the product flow rate and the desired amount of free chlorine.
During process operation, chemical from the refillable bucket is drawn up the suction line to the chemical
pump. From the suction side of the pump the chemical passes to the discharge side through the four-
function valve. The four-function valve prevents anti-siphoning of the chemical when the pump is not
running, allows for priming of the discharge line if the prime has been lost during maintenance or
shutdown, and allows for draining of the discharge line for maintenance or disassembly. From the four-
function valve the chemical is pumped into the discharge line and then injected into the system by the
injection check valve. The purpose of the check valve is to prevent water in the piping from entering the
injection system.
Sodium bisulfite is injected into Adaptor A-11 (see Figure 24), which contains a static mixer. The static
mixer uses non-moving baffles to thoroughly mix the sodium bisulfite solution into the raw water stream
before the raw water is discharged into the MF feed tank.
INJECTION CHECK VALVE V-613
STATIC MIXER
ADAPTOR A-11
CP-1 BISULFITE
PUMP DISCHARGE TUBING
RAW WATER
PUMP
MF FEED TANK
MF FEED
TOP VIEW
PUMP P-3
OF TWPS
Figure 24. Adaptor A-11 Sodium Bisulfite Injection Point.
0003 00-28
