Disinfection of Pipelines - Disinfection of Pipelines and Storage Facilities Field Guide - page 44

Table 3-9b Chlorine solution required for 25 mg/L dosage

Amount 1% Solution
Needed for *

Amount of 5% Solution
Needed for

500 ft
(152.4 m)
in . mm gal L gal L gal L gal L
2 11, 50 0.04 0.2 0.20 0.8 0.01 0.03 0.04 0.2
4 1, 100 0.16 0.6 0.80 3.1 0.03 0.12 0.16 0.6
6 1, 150 0.36 1.4 1.79 6.9 0.07 0.28 0.36 1.4
8 1, 200 0.64 2.5 3.19 12.3 0.13 0.49 0.64 2.5
10 1, 250 1.00 3.9 4.98 19.3 0.20 0.77 1.00 3.9
12 1, 300 1.43 5.6 7.17 27.8 0.29 1.1 0 1.43 5.6
16 1, 350 2.55 9.9 12.75 49.4 0.51 2.0 0 2.55 9.9
18 1, 400 3.23 12.5 16.13 62.5 0.65 2.5 0 3.23 12.5
20 1, 450 3.98 15.4 19.92 77.2 0.80 3.1 0 3.98 15.4
24 1, 600 5.74 22.2 28.68 111.1 1.15 4.4 0 5.74 22.2
30 1, 750 8.96 34.7 44.82 173.7 1.79 6.9 0 8.96 34.7
36 1, 900 12.91 50.0 64.54 250.1 2.58 10.0 0 12.91 50.0
42 1,100 17.57 68.1 87.84 340.4 3.51 13.6 0 17.57 68.1
48 1,200 22.95 88.9 114.73 444.6 4.59 17.8 0 22.95 88.9
54 1,400 29.04 112.5 145.20 562.7 5.81 22.5 0 29.04 112.5
60 1,500 35.85 138.9 179.26 694.7 7.17 27.8 0 35.85 138.9
64 1,600 40.79 158.1 203.96 790.4 8.16 31.6 0 40.79 158.1
* Prepare 1% chlorine solution by mixing 1 lb (454 g) calcium hypochlorite or 3 L of
10% sodium hypochlorite solution in 8 gal (30.3 L) of water.

Pipe
Diameter

100 ft
(30.48 m)

500 ft
(152.4 m)

100 ft
(30.48 m)

Table
Tamer

These tables show the amount of chlorine needed to
achieve a 25 mg/L dosage in pipelines of various diameters
and in both 100- and 500-ft lengths. The term “liquid
chlorine” follows the convention used in ANSI/AWWA
Standard B301. Example using Table 3-9b: 500 ft of 24-in.
pipeline requires about 5.74 gallons of 5% sodium
hypochlorite solution to achieve a 25 mg/L dosage.

Continuous-Feed Method Calculator
To calculate the chlorine feed rate to achieve 25 mg/L inside
pipeline (does not account for chlorine demand).