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
The raw water inlet strainer is connected to the end of a green-banded suction hose. The strainer floats
just under the water, but still above the bottom of the water source. This keeps the TWPS from picking
up bottom mud. The strainer contains a perforated screen that keeps out large surface debris and fish.
An anchor is used to deploy the strainer and hold it in place. A 300 ft. rope secures the anchor to the
strainer and is used to deploy and retrieve the anchor and the inlet strainer. A second, non-floating
strainer is included with the cold weather module for use with ice holes.
The ocean intake structure system (OISS) is used for drawing raw water through beach well point intakes
for raw water sources with surf or extreme tidal conditions. The OISS consists of four well points with
risers connected to a header by yellow-banded hoses. The well points are slotted and screened to keep
the beach sand out of the well points and risers. The well points and risers are jetted into the sand using
one of the raw water pumps to draw water from the source and discharge it through a riser and wellpoint.
Once the riser/wellpoint assemblies are installed, the pumps are set up as usual with the suction attached
to the header end of the OISS. Water is drawn up through the well points and pumped through the raw
water system.
Thirteen sections of three-in. diameter, ten-ft. long suction (rigid) green-banded hose come with the
TWPS. These hose sections are used as needed to transport raw water from the inlet strainer or OISS to
one of the two raw water pumps. The number used depends on site conditions.
The TWPS is equipped with two raw water pumps: an Electric Motor-Driven Pump P-2 and a Diesel
Engine-Driven Pump P-1. If the elevation of the MF feed tank is 25 ft. or less above the pump location
and within 200 ft. of the source, the Motor-Driven Pump P-2 is normally deployed without the P-1 pump.
The P-1 pump may also be used by itself in this situation. If the MF feed tank is more than 25 ft. above
the pump location or further than 200 ft. from the source, then both the Diesel Engine-Driven Pump P-1
and the Motor-Driven Pump P-2 are deployed. The engine-driven pump is deployed closest to the source
and the motor-driven pump is deployed between the engine-driven pump and the MF feed tank. Figure 2
shows both pumps deployed. Valve V-103 is connected at the bottom of the Diesel Engine-Driven Pump
P-1 and is used to drain the pump when needed such as for transportation, storage, or maintenance.
Valve V-105 is a drain valve at the bottom of the Electric Motor-Driven Pump P-2 and serves the same
function as V-103.
Adaptor Assembly A-01 connects the three in., green-banded suction hose from the water source to the
suction inlet of the first pump. Adaptor Assembly A-01 includes Raw Water Suction Check Valve V-101,
which helps hold the prime when the pump is stopped. A strap on the adaptor is secured to the pump
frame to support the adaptor and the hose that is connected to the adaptor.
The cyclone separator is used at ocean beach water sites when the floating strainer is used. Both Raw
Water Pumps P-1 and P-2 are deployed when the cyclone separator is used. The separator is positioned
at the discharge of Electric Motor-Driven Pump P-2. As water enters the cyclone separator, a high-speed
swirl is formed. The heavier dirt and/or sand is thrown to the outside and drops to the bottom of the
separator where it is carried out by a small amount of water underflow. The required underflow is 5
gallons per minute (gpm). The main water flow leaves the cyclone separator at the center of the top of the
separator to a discharge hose.
Adaptor Assembly A-03 connects the cyclone separator underflow outlet to a one-in. diameter, five-ft.
long, braided flexible hose. Adaptor Assembly A-03 includes Cyclone Blowdown Flow Valve V-104,
which is manually set to provide an underflow of five gpm. The nominal TWPS flow requirement is 65
gpm. When the cyclone separator is deployed, the raw water pumps will deliver 70 gpm and the net flow
from the raw water system will be 65 gpm.
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