Environmental Engineering Reference
In-Depth Information
The first value is 5% of the volume of the tank. This
comes from the tank volume calculators or Table 5-2 for
horizontal cylindrical tanks and then multiplied by 0.05
to obtain the 5% volume (for the horizontal cylindrical
tank use 0.1 as the factor to obtain the 5% volume).
Next, insert the value from Table 5-6 for the chemical
selected (liquid chlorine, sodium hypochlorite, or calcium
hypochlorite).
The third factor is an adjustment for the strength of the
chemical if it differs from the amount in Table 5-6. The
factor is the strength shown in the table divided by the
strength you are using.
The fourth factor is the volume used in Table 5-6 (either
100,000 gallons for US units or 100 cubic meters for SI
units).
Example 1.
The chlorinate and fill method is used for a
vertical cylindrical tank that is 20 ft in diameter and the maxi-
mum depth to the overflow is 30 ft. The disinfection chemical
selected is 10% sodium hypochlorite.
Use all US units.
1. Volume from vertical cylindrical tank calculator
5.87
20 ft
20 ft
30 ft
0.05 = 70,400 gal
0.05 =
×
×
×
×
×
3,520 (for 5% depth and volume)
2. Amount of sodium hypochlorite from Table 5-6
97 gal
3. Chemical strength factor is Table 5-6 strength/strength
in example
5% ÷ 10% = 0.5
4. Volume used in Table 5-6
100,000 gal
Plug these values into the calculator.
3,520
0.5 ÷ 100,000 = 1.7 gal of 10% sodium
hypochlorite
97
×
×
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