TM 10-4610-241-24
TO 40W4-13-42
3-46.
MULTIMEDIA FILTER REPAIR-continued.
f.
Assembly.
CAUTION
Pouring coarse gravel through upper handhole opening may damage filter lining.
(1)
Place a total of 240 pounds (109 kg) of 1/4-inch medium underbed gravel in multimedia filter (17) through
lower handhole opening (28).
(2)
Use paddle or narrow board to level gravel.
(3)
On lower handhole opening (28), install flange gasket (27), flange cover (26) and twelve bolts (25) and nuts
(24).
NOTE
Steps (4) thru (7) must be performed in the given sequence. After each addition of
filter material the material must be leveled.
Approximate levels of filtration material are indicated in illustration.
(4)
Using hand scoop, load 170 pounds (77 kg) of No. 12 coarse garnet through upper handhole opening (23).
Using paddle or narrow board level the added material.
(5)
Repeat step (4) for 180 pounds (82 kg) of No. 50 fine garnet.
(6)
Repeat step (4) for 230 pounds (104 kg) of filter sand.
(7)
Repeat step (4) for 345 pounds (156 kg) of No. 2 anthracite.
(8)
On upper handhole opening (23), install gasket (22), flange cover (21), eight bolts (20) and nuts (19).
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