Environmental Engineering Reference
In-Depth Information
3. Place an equal number of tablets at each end of a given
pipe length. Place one tablet in each hydrant, hydrant
branch, and other appurtenance.
4. Gently fill the main with water. Ensure that the filling
rate does not result in a velocity greater than 1 ft/sec
(0.3 m/sec). Eliminate air pockets.
Ops
T
ip
Fill the line slowly (1 ft/sec or less) to avoid flushing all of
the granules to one end of the pipe. See Table 3-1.
Table 3-7a Calcium hypochlorite granules for 25 mg/L dosage by weight
for each 500-ft (152.4-m) interval
Pipe Diameter
Calcium Hypochlorite Granules
in
.
mm
oz
g
2
50
0.4
11,
12
4
100
1.7
11,
48
6
150
3.8
1,107
8
200
6.7
1,
190
10
250
10.5
1,
297
12
300
15.1
1,
428
14
350
20.4
1,
582
16
400
25.1
1,
761
18
450
31.8
1,
963
20
500
39.1
1,189
24
600
56.5
1,712
Table
Tamer
Table 3-7a is used to determine the weight of calcium
hypochlorite needed to achieve a 25 mg/L chlorine residual
in a 500-ft length of pipe of different diameters.
Example: Amount needed for 500 ft of 6-in. pipe = 3.8 oz or
107 g (about
¹₄
lb). See shaded row above.
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