Disinfection of Storage Facilities - Disinfection of Pipelines and Storage Facilities Field Guide - page 74

factor is the strength shown in the table divided by the
strength you are using.

￿ The fourth factor is the volume used in Table 5-3 (either

100,000 gallons for US units or 100 cubic meters for SI
units).

Example 1. The full storage facility chlorination method
is used for a vertical cylindrical tank that is 20 ft in diameter
and the maximum depth to the overflow is 30 ft. The disinfec-
tion chemical selected is 10 percent sodium hypochlorite.
Use all US units.
1. Volume from vertical cylinder calculator
5.87 30 ft = 70,400 gal

2. Amount of chemical from Table 5-3 for 5% sodium
hypochlorite
19.4 gal
3. Chemical strength factor is Table 5-3 strength/strength
in example
5% ÷ 10% = 0.5
4. Volume used in Table 5-3
100,000 gal
Plug these values into the calculator.
70,400

20 ft 20 ft

× × ×

19.4 0.5 ÷ 100,000 = 6.8 gal of 10% sodium

× ×

hypochlorite

Example 2. Using the full storage facility chlorination
method for a 10 mg/L chlorine dosage and a 24 hr contact time,
how much 65 percent calcium hypochlorite is needed for a rec-
tangular tank that is 10 m long, 5 m wide, and has a maximum
water depth of 5 m?
Use all SI units.
1. Volume from rectangular tank calculator
10 × 5 × 5 = 250 m 3