Disinfection of Storage Facilities - Disinfection of Pipelines and Storage Facilities Field Guide - page 77

Fill Line

Fire Hydrant
(Alternate Source
When Applicable)

Clear Water Reservoir CL 2 Tank

Pump Discharge
Upstream
Source
to Tank

1½-in.
Fire Hose

Wash Line
Injection Point 2½-in.

MFHA

Closed
Isolation Valve
(Inside Pump
Station or Vault)

2½-in.
MFHA

2½-in.
MFHA

Wash Line

Courtesy Nicole Peschel
Figure 5-2 Surface application method installation (large tank example)

Chlorination Amount Calculation
This method uses a 200 mg/L chlorine solution (prepared
according to Table 5-4) to spray all of the exposed surfaces inside
the storage facility. The volume needed will vary depending on
the size of the facility. Sodium and calcium hypochlorite are com-
monly used to make the chlorine solution used for this method.

Example 1. How much 10% sodium hypochlorite is
needed to prepare 150 gal of 200 mg/L chlorine solution needed
to spray the inside of a storage facility?
From Table 5-4: 4.8 cups or 1.2 L are needed .

Chlorinate and Fill Method
Chlorine and water are added so that about 5 percent of the
storage volume of the facility is filled (Figures 5-3, 5-4, and 5-5),
and this water has a chlorine residual of approximately 50 mg/L.
After a retention period of at least 6 hr, the facility is filled to