Disinfection of Pipelines - Disinfection of Pipelines and Storage Facilities Field Guide - page 13

Chapter 3
Disinfection of Pipelines
Operators should follow these important steps to provide the
maximum public health protection when installing new or
replacement drinking water mains and other pipelines intended
for potable water service. Each of these steps is discussed in more
detail in the following sections.
1. Inspection
2. Sanitary Construction Methods
3. Flushing or Cleaning
4. Preventing Backflow During Installation
5. Providing Temporary Service
6. Chlorination (Chemical Disinfection)
7. Final Flushing
8. Bacteriological Testing
9. Connection to Distribution System
10. Documentation
Inspection
The pipes and appurtenances should be examined for any
damage with close attention to joints. Any damage to the pipe
ends or gasket areas may result in leakage. Any damaged sec-
tions should be rejected. The pipe sections should be clean and
free of blemishes on the pipe interior. The coatings and linings
should be fully cured before completing installation. Before placing
pipe in a trench, it should be thoroughly inspected for contamina-
tion and interference.
Sanitary Construction Methods
The installation methods for water mains should include the
adoption of sanitary procedures that can improve disinfection.
These procedures are critical to achieve satisfactory bacteriological
13