TM 10-4610-232-12
c.
Raw Water Pump (4). This pump is mounted on a separate frame so it can be located near the water source. A detachable
hand pump (5) is provided to help prime the pump rapidly. The pump is self priming after the initial prime and can pull the air
out of the suction hose when started. The hand pump is not mandatory but helps speed the Initial priming. Raw water is
drawn through the intake strainer and suction hose, pressurized, and discharged through the cyclone separators (6) to the
ROWPU. The pump can lift raw water to 15 ft (4.5 m) above the surface level of the water source. The discharge water
pressure is great enough to allow placement of the ROWPU up to 30 ft (9 m) above the pump.
d.
Cyclone Separators (6). On Model WTA-060, two cyclone separators are mounted on a separate frame and located near the
raw water pump frame (See Figure 1-8, Sheet 1). On the ROWPU-1 Model, there is one separator which is mounted onto the
trailer in one of the trailer stake pockets (See Figure 1-8, Sheet 2). As water enters the cyclone separator, a high speed swirl
is formed. The heavier dirt is thrown to the outside and drops to the bottom where it is carried out by a small amount of water
flow. The main water flow (101 gpm, 382 lPM) leaves the separator at the center of the top and enters the discharge hose to
flow to the ROWPU. The cyclone(s) will remove dirt which will settle in a glass in 20 minutes. They are very important for
sand removal at ocean beach deployment areas.
e.
Raw Water Discharge Hose (7). On all models, four 50 ft (15 m) lengths of 2-1/2 in. (6.4 cm) canvas hoses, which are used to
carry raw water to the cyclone separator(s), a supplied with the ROWPU. Model WTA-060 is supplied with two 10 ft. (3 m)
lengths of 2 in. (5.1 cm) rubber hoses, and Model ROWPU-1 is supplied with one 10 ft (3 m) length of 2 in. (5.1 cm) rubber
hose. These hoses are called raw water to cyclone separator(s) hoses and are used to carry water from the cyclone
separator(s) to the Water Purification System. The connectors are cam and groove type (quick disconnect). On Model WTA-
060, you lose 9 gallons (34.1 l) of water through drain hoses on the cyclone separators. On Model ROWPU-1, you lose 5
gallons (19 l) of water through the drain hose on the cyclone separator.
1-14. WATER PURIFICATION SYSTEM . Water from the Raw Water Intake System is discharged to the Water Purification System.
Here, the water is filtered, treated with chemicals, and pressurized for the reverse osmosis process which reduces the TDS of the
water. All necessary piping, valves, controls, and indicators required to accomplish purification of the feed water and cleaning of the
system components are included.
a.
Filtration (Figure 1-9). The raw water is first treated by filtration. The filters reduce the turbidity of the raw water by removing
suspended particles of fine clay, dirt, and organic matter. Turbidity not only makes water unfit to drink, but it may also foul
(clog) the RO elements. Usually the water leaving the cartridge filter will have a turbidity of 0.5 to 1.5 NTU. This turbidity
value will cause only slow fouling which can be removed by routine RO element cleaning. Fouling reduces the amount of
water which can be produced by the ROWPU.
Change 12 1-13
