Environmental Engineering Reference
In-Depth Information
Pressure
Relief
Gas-Flow
Indicator
Downstream
Vacuum
Regulator
Upstream
Vacuum
Regulator
Venturi/
Check Valve
Solution to
Point of
Application
Gas-Flow
Control
Valve
Booster
Pump
Gas
Supply
Water
Figure 3-14
Vacuum-operated solution-feed system
Chlorine Amount Calculation
The following tables and calculators should be used to deter-
mine the amount of chlorine needed for the continuous-feed
method. Chlorine is fed into the water filling the pipeline to
achieve a 25 mg/L dosage.
Use the chlorination chemical amount calculation checklist on
page 28.
The pipeline diameter and length are used to calculate the
volume of the pipeline from Table 3-6.
The number of valves, hydrants, and other appurtenances
determine the number of tablets needed for disinfection of
these items. Usually one tablet for each is adequate.
This method requires that the entire pipeline is filled with
water so the volume of the pipeline is the same as the vol-
ume of chlorination water (Table 3-6)
The amount of chlorine chemical needed for the job comes
from Tables 3-9a and 3-9b, depending on the length and
size of pipe and whether liquid chlorine or sodium
hypochlorite are used. The solution or gas chlorinator feed
rate is determined using the calculators c3-1, -2, -3, -4, -5.
Each calculator equation is for a specific chemical and unit
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