TM 5-4610-223-12
Legend for figure 2-23:
1. Filter air vent gate
11.
Gate control valve CV-40,
control valve CV-38, 3/8 in.
1 1/2 in.
2. Air release valve ARV-50
12.
Influent draincock DC-42,
3. Filter housing cover
1/8 in.
4. Swing check valve SCV-47,
13.
Effluent draincock DC-44,
1 1/2 in.
1/8 in.
5. Effluent plug control valve
14.
Quick acting gate valve
CV-46, 1 1/2 in.
CV-34, 1 1/2 in.
6. Flow controller valve
15.
Draincock DC-39, 1/8 in.
CV-45
16.
Quick acting gate valve,
7. Influent pressure gage
drain valve, DV-49, 2 in.
PG-2
17.
Precoat funnel control
8. Effluent pressure gage
gate valve CV-37, 3/4 in.
PG-3
18.
Precoat funnel (2 reqd)
9. Effluent draincock
19.
Draincocks, brass, DC-53
DC-43, 1/4 in.
and DC-54, 1/8 in.
10. Influent draincock
20.
Filter window
DC-41, 1/4 in.
(d)
Close draincocks DC-53 and DC-54 (19) located on valve CV-45 (6).
(e)
Turn valve CV-46 (5) to RECIRCULATE position.
(f)
Turn valve CV-36 (9, fig. 2-24) to FILTER position.
(g)
Set valve ARV-50 (2, fig. 3-21) to FILTER position and valve CV-45 (6) for 20 gpm.
(h)
Open valve CV-37 (17) below precoat funnel (18) and valve CV-38 (1) above funnel.
(2)
Introducing filter aid and precoating.
(a)
The concentration of diatomaceous earth slurry for the initial charge is 1/2 pound per gallon of
water, as shown on the calibration chart, figure 2-25.
(b)
Use the aluminum measure and measure out 1/2 pound of diatomaceous earth into it.
(c)
Place diatomaceous earth in 3-gallon rubber pail and add 1 gallon of coagulated water to pail
and mix well.
NOTE
Coagulated water may be obtained for a general purpose from valve CV-15 (7, fig. 2-15) (d) Pour
diatomite slurry from pail into precoat funnel (18, fig. 2-23).
2-42 Change 1
