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
FEEDWATER CHANNEL
FILTRATE COLLECTION
CHANNEL
MF FIBERS
Figure 6. Micro-Filtration (MF) Process.
Filtrate that flows out the upper end of the MF assembly flows through Upper Filtrate Outlet Valve V-201
(see Figure 7). During normal operation V-201 is de-energized open to allow normal flow to Filtrate Flow
Control Valve V-202. Filtrate that flows out the lower end of the assembly flows directly to Valve V-202.
MF Filtrate Pressure Gauge PI-201 measures the filtrate pressure in the line between the Micro-filter (MF)
assembly and Filtrate Flow Control Valve V-202. Piping directs the filtrate through the automatic Filtrate
Flow Control Valve (V-202) and into the RO feed tank.
Pressure Transmitters PT-101 (see Figure 6) and PT-102 (see Figure 7) measure the feed and filtrate
pressures. The difference between the feed pressure and the filtrate pressure is the trans-membrane
pressure (TMP; pressure drop across the membranes, or filter element fibers, of the MF assembly). TMP
(pressure drop) is displayed at the operator control panel (OCP) and is an indication of how clogged the
fibers are. A high TMP indicates that the MF fibers are becoming clogged with material and need to be
cleaned. A high alarm indicates the need to clean the MF. The Operator can also compare the PI-101
feed pressure gauge reading with the PI-201 filtrate pressure gauge reading as a manual check against
the automatically measured and calculated TMP.
UPPER FILTRATE
OUTLET VALVE V-201
MF FILTRATE
PRESSURE
GAUGE PI-201
FILTRATE FLOW
CONTROL
VALVE V-202
PRESSURE
TRANSMITTER PT-102
Figure 7. MF System: MF Modules to Discharge to RO Feed Tank.
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