1-8. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS OF ROWPU.
a. General. This paragraph describes the location of the major parts of the ROWPU as they are seen on the
unit. It also gives a brief description of the function of each item.
b. External View. (Figure 13) shows the ROWPU with the canvas cover rolled back.
(1) The CANVAS COVER (1) protects the ROWPU from weather and dirt during transportation and when
the ROWPU is not in use. During normal operations it is rolled up as in (figure 13).
(2) The four R.O. VESSELS (2) contain the high-pressure elements which are the last step in purifying raw
water. The R.O. elements remove compounds, called dissolved solids, that cannot be taken out by other filters.
(3) (ARMY). The TRANSPORTATION TRAILER (3) carries the ROWPU, its power generator, and all items
necessary for operation. The trailer is 18 feet (5.5 meters) long, by 8 feet (2.4 meters) high, by 8 feet (2.4 meters)
wide. The trailer with the ROWPU and generator weighs about 8.5 tons (7.7 tonnes).
(4) The R.O. PUMP and MOTOR ASSEMBLY (4) are located behind a protective shroud (screen). The
R.O. pump forces water under high pressure through the R.O. vessels.
(5) The CONTROL PANEL (5) has most of the hose connections, valves, gages, switches, and meters
necessary for running the ROWPU.
(6) The three sections of the GROUND ROD (6) are driven into the ground and attached to a ground lug on
the ROWPU frame to keep operators from getting electric shocks.
(7) The CONTROL BOX ASSEMBLY (7) is located on the control panel. It consists of toggle switches that
control the panel lights, all pumps, and the pump indicator lamps.
(8) (ARMY). The GENERATOR SET (8) is a diesel generator that provides power to the ROWPU.
(9) The JUNCTION BOX ASSEMBLY (9) contains circuit breakers, overload heaters, motor starters, etc.
c. Internal View. (Figure 1-4) shows the ROWPU with the canvas cover removed to show the inside.
(1) The MULTIMEDIA FILTER (1) is a large tank that removes large particles from the raw water.
(2) The R.O. elements (2) (inside R.O. vessels) remove dissolved solids from the raw filtered water.
(3) The R.O. pump (3) (shown in dotted lines behind the control panel) forces filtered water under high
pressure through R.O. elements.
(4) The CARTRIDGE FILTER (4) is the second stage of the water purification process. The cartridge filter
removes very small particles from the water coming out of the multimedia filter.
(5) The PULSE DAMPENER (5) (shown in dotted lines behind the cartridge filter) is a ball-shaped metal
tank that is only partially filled with water. The pulse dampener reduces pulses in water flow caused by the pistons
of the R.O. pump.
(6) The BOOSTER PUMP (6) promotes water flow from the multimedia filter through the cartridge filter.
(7) The CHEMICAL FEED PUMP (7) supplies four chemicals to different stages of the purification process.
(8) The CHEMICAL FEED PUMP MOTOR (8) drives the chemical feed pump.