Pipeline Chlorination Simplified - Disinfection of Pipelines and Storage Facilities Field Guide - page 115

Fill Line

Flowmeter

¾-in. Sample Tap

Fire Hydrant

Cl 2 Tank

2½-in. MFHA
2-in. Isolation
Valve

Gauge

2 ft

Pump Discharge

Existing Ground Line

1½-in. Corporation Valve #2

2½-in. MFHA

1½-in. Corporation Valve #1

Water Main

Main

Isolation Valve #1 Isolation Valve #2

20% Slug

Courtesy Nicole Peschel
Figure 8-1 Pipeline disinfection slug method example

Table 8-4 should be used to calculate the volume of the pipe-
line and its 20 percent volume of the slug. The 20 percent slug
volume will be the volume of 100 mg/L chlorine solution that will
be needed. The fill rate and the withdrawal rate are the same in
this case so the variables are reduced. The withdrawal rate for a
3-hr contact time is given in Table 8-5. The 100 mg/L chlorine
solution is prepared as needed in a tank or is prepared by match-
ing the fill rate with the feed rate from a 1 percent or 5 percent
chlorine solution source (Table 8-5).