1-13. SYSTEM TECHNICAL PRINCIPLES OF OPERATION - continued.
When chemical or nuclear contaminates are present in product water, they are filtered out between the two
product water tanks The ROWPU is overpacked with two portable filters that can be connected with one of the raw
water pumps in the line that connects the two tanks. One of the filters is used when the water is contaminated with
chemicals. The other filter is used for nuclear contaminants
1-14. COMPONENT TECHNICAL PRINCIPLES OF OPERATION.
a. Suction Hose Strainer (1). Prevents large pieces of trash from entering system.
b. Float (2). Holds suction hose strainer between surface and bottom of raw water source
c. Raw Water Pumps (3). Draw raw water through suction hose stainer and send it under pressure to multimedia
filter When chemical or radiological filters are used in the product water line, one raw water pump is used between
the two product water tanks to force water through the filter.
d Chemical Feed Metering Pump Assembly (4). Draws chemical solutions from chemical cans and injects them into
water at various points in purification system.
e. Chemical Feed Metering Pump Motor (5). Provides power for four chemical feed metering pump drive units.
f. Polymer Drive Unit (6) Adds polymer solution to raw water Polymer solution collects small pieces of floating solid
matter into groups large enough to be removed by multimedia filter.
g. Sodium Hex Drive Unit (7). Adds sodium hex to raw water. Sodium hex prevents scaling.
h. Citric Acid Drive Unit (8). Adds citric acid to output of multimedia filter prior to ROWPU shutdown. Citric acid
removes scaling developed in system during operation
i. Raw Water Flow Meter (9). Indicates rate of flow of water drawn in by raw water pumps.
j. Backwash Valve (10). In NORMAL position, allows raw water to enter multimedia filter and closes the backwash
line. In BACKWASH position, allows brine to enter multimedia filter and closes raw water line.
k. Multimedia Filter Control Valve (11). Routes water flow into and out of multimedia filter. During normal ROWPU
operation, the multimedia filter control valve routes raw water from the backwash valve to top of multimedia filter
while routing filtered output from bottom of multimedia filter to booster pump. During backwash, the multimedia
control valve routes brine from backwash valve to bottom of multimedia filter while routing contaminated water
from top of multimedia filter out of ROWPU through WASTE outlet on front panel. The multimedia filter control
valve also changes flow rate during different stages of backwash.