What is AWWA C651?
Back to AWWA C651-05 Disinfecting Water Mains. This standard describes essential procedures for the disinfection of new and repaired potable water mains. New water mains shall be disinfected before they are placed in service.
How long should Mains be flushed prior to disinfection?
The required number of tablets are placed on the inside top of each joint and held in place by an approved mastic. The main is then filled with water at a velocity of less than 1 fps and the water is left in the main for at least 24 hours before flushing.
What is AWWA c652?
This standard for disinfection of water-storage facilities describes materials, facility preparation, application of disinfectant to interior surfaces of facilities, and sampling and testing for the presence of coliform bacteria, chlorine residual, and acceptable aesthetic water quality.
How do you disinfect a pipeline?
There are various ways of disinfecting pipelines, but the most common is to use chlorine. The two forms of chlorine suitable for disinfecting pipelines are calcium hypochlorite and sodium hypochlorite. These are described in Fact Sheets 2.19 and 2.20.
What disinfectants are approved for water system disinfection?
Chlorine and chloramine are the major disinfectants used in public water systems.
How much chlorine do I need to disinfect my water pipes?
An initial chlorine concentration of 50 to 100 parts per million (ppm) is recommended.
How do you chlorinate water pipes?
Disinfect The pipe should be dosed to 50mg/l of free chlorine and then held for one hour. The residual at the end of this period should be at least 45mg/l. The pipe should then be flushed clear of all highly chlorinated water as above. All highly chlorinated water must be de-chlorinated before discharge.
How do you Dechlorinate super chlorinated water?
Currently, sodium bisulfite, sodium sulfite and sodium thiosulfate are most frequently used by water utilities for dechlorination.
Does chlorine damage copper pipe?
Chlorine Is Corrosive To Copper This has a corrosive effect on the inside of the pipes and slowly erodes the piping over time. Eventually, chlorine eats all the way through the pipes and creates pinhole leaks, which if left unchecked, can cause a myriad of problems within the home.
How does chlorine disinfect?
How does chlorine disinfection work? Chlorine kills pathogens such as bacteria and viruses by breaking the chemical bonds in their molecules. Disinfectants that are used for this purpose consist of chlorine compounds which can exchange atoms with other compounds, such as enzymes in bacteria and other cells.