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
MF System: MF Modules to Discharge to RO Feed Tank (see Figure 10)
Upper Filtrate Outlet Valve V-201. V-201 is open during normal filtering operation and is
actuated closed or open as required during backwash operations.
Filtrate Flow Control Valve V-202. Controls the filtrate flow to the RO feed tank during normal
filtering operation and closes or opens as required during backwash operations.
pressure measured by PT-101 (Figure 9) 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 porous (or how clogged) the fibers are. A high TMP indicates that the MF fibers
are becoming clogged with material and need to be cleaned.
MF Filtrate Pressure Gauge PI-201. Measures the filtrate pressure in the line between the
micro-filter (MF) assembly and the RO feed tank. The pressure indication is for operator
reference. The operator can compare the PI-101 feed pressure gauge reading with the PI-201
filtrate pressure gauge reading as a manual check against the TMP that is measured
automatically by Pressure Transmitters PT-101 and PT-102.
Check Valve V-912. Allows 15 psig air into the MF Assembly to drain the MF fibers just before
backwash and for drain-down. Allows 100 psig air into the MF Assembly to backwash the MF
fibers. Prevents water from backflowing into the air system.
MF Filtrate Sample/Drain Valve V-204. Used to sample filtrate and as a drain.
MF Filtrate Drain Valve V-203. Used to drain the filtrate channels of the MF Assembly.
CHECK VALVE V-912
UPPER FILTRATE OUTLET VALVE V-201
MF FILTRATE PRESSURE GAUGE PI-201
PRESSURE TRANSMITTER PT-102
FILTRATE FLOW
CONTROL VALVE V-202
DISCHARGE TO RO FEED TANK
MF FILTRATE SAMPLE/DRAIN VALVE V-204
MF FILTRATE DRAIN VALVE V-203
Figure 10. MF System: MF Modules to Discharge to RO Feed Tank.
0002 00-10
