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
Vent/Sample Valve V-110. Used to vent the pipe run above the basket strainer when draining
the strainer. Also used as a sample valve for measuring the raw water conductivity.
MF Main Feed Valve V-111. Operates automatically to prevent feed water from flowing back into
the MF feed tank when the MF filters are backwashed (during the backwash cycle).
Pressure Gauge PI-101. Measures pressure of the MF feed supplied to the micro-filter (MF)
assembly. The pressure indication is for operator reference.
located in the instrument/solenoid panel box shown in Figure 23). FE-101 and FT-101 measure
the MF flow (feed flow to the MF assembly when filtering, backwash flow to the MF assembly
during backwash). This flow is displayed at the operator control panel (OCP).
Upper Feed Valve V-112 and Lower Feed Valve V-113. The two valves open and close
automatically as required to direct the flow of MF feed water to the MF filter assembly during
normal filtering operation and during backwash operations.
Micro-Filtration (MF) Assembly. Consists of 12 parallel filter modules, MF-1 through MF-12,
that remove suspended solids and microorganisms from the MF feed water. Each filter module
contains a filter element that is composed of a bundle of hollow, porous fibers. MF feed water
enters the MF assembly, passes through the porous wall of each fiber, and exits the hollow core
of each fiber as filtrate (filtered MF feed water). The suspended solids and microorganisms that
accumulate on the fibers are removed from the fibers during regular automatic backwashes.
Check Valve V-911. Allows 15 psig air into the MF Assembly to drain the MF fibers just before
backwash and for drain-down. Prevents water from backflowing into the air system.
MF Vent Valve V-114. Vents the MF Assembly during cleaning stages and TWPS shut-down.
PRESSURE GAUGE PI-101
CHECK VALVE V-911
FLOW
UPPER FEED VALVE V-112
ELEMENT
FE-101
MF MAIN FEED
VALVE V-111
VENT/SAMPLE
MF VENT VALVE V-114
VALVE V-110
FILTRATE OUT
WASTE
DRAIN VALVE
OUT
V-109
PRESSURE
MF MODULE
TRANSMITTER
PT-101
FILTRATE
BASKET
OUT
STRAINER
S-2
WASTE
LOWER FEED
OUT
VALVE V-113
MF ASSEMBLY
Figure 9. MF System: Strainer S-2 to MF Modules.
0002 00-9
