TM 5-4610-223-12
2-6. STOPPING.
a.
Stopping Distribution Pump.
CAUTION
This unit retains water in its piping assemblies and is susceptible to damage from freezing if not
properly drained.
In order to completely drain the system and avoid damage, follow the step by step draining instructions in steps
(1) and (2) below, and paragraphs 2-6, b. and c.
(1)
Electrically driven pump. If an electrically driven pump is used to distribute the filtered water, stop it, and
service as follows:
(a)
Press STOP button (14, fig. 2-1) to stop pump.
(b)
If the weather is cold enough to freeze, drain all hoses. Open draincock (9, fig. 2-18) in base of
pump. After all water drains, close draincock.
(2)
Gasoline engine driven pump. If the gasoline engine driven pump was used for distributing the filtered
water, see instruction plate on the pump engine for stopping Instructions.
b.
Shutting Down Diatomite Filter. The diatomite filter elements must be backwashed and the diatomite filter
drained whenever the flow through the filter stops or the effluent pressure gage PG-3 (8, fig. 2-23) reads approximately 5
psi. All old filter cake must be removed quickly and drained to waste.
(1)
Backwashing filter elements.
(a)
Close gate control valve CV-40 (11, fig. 2-23), located below flow controller valve CV-45 (6).
(b)
Allow filter pumps to operate until effluent pressure gage PG-3 (8) reads same as filter influent gage
PG-2 (7). Stop filter pumps by pressing STOP buttons (11 and 12, fig. 2-1).
(c)
Close quick acting gate control valve CV-34 (14, fig. 2-23), on suction line to filter pump.
(d) Turn air release valve ARV-50 (2) to BACKWASH position, and then immediately open filter quick acting drain valve
DV49 (16).
(e)
After filters have completely drained, turn influent plug control valve CV-36 (3, fig. 2-19) to WASH
position. This will allow water to enter the wash ring (6, fig. 2-28) and clean the bottom of the filters.
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