AWWA C651-05 PDF
(Revision of ANSI/AWWA C). Copyright © This document is an American Water Works Association (AWWA) standard. It is not a. 1, , AWWA issued the updated ANSI/AWWA C 14 standard, Disinfecting Water Mains, a result of the review that AWWA standards must go through. AWWA Standard for Disinfecting Water Mains – Jun 1, – Ansi/AWWA C DS60 Water Supply Distribution Standard – Pipelines Other.
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Larger sizes must be handled on a case-by-case basis. The repair site should be accessible and the trench adequately dewatered so that the repair site can be cleaned and disinfected by spraying or swabbing with a minimum 1 percent chlorine solution. A set of samples includes all samples collected along the length of the pipeline, as described in Sec. The chlorinated water shall be retained in the main for at awws 24 hr, during which time valves and hydrants in the treated section shall be operated to ensure disinfection of the appurtenances.
Wailes, Consultant, Black Hawk, Colo. Disinfection of Water Distribution Systems. The chlorinated water shall remain in the pipe for at awda 24 hr. Packing material shall be handled in a manner that avoids contamination. Information f651-05 Application of This Standard. Purchaser Options and Alternatives. The flushed water should run visually clear, and have typical system chlorine residual if the system operates with a disinfectant residual.
Responsibility for tapping existing mains and connections to new mains Sec. The use of AWWA standards is entirely voluntary. Thorough consideration should be given to the impact of highly chlorinated water flushed into the environment. When check samples are taken, it is advisable to sample water entering the new main to determine if excessive turbidity is present that could be interfering with results. PDF and Related Books. The continuous-feed method is suitable for general application.
Then collect, using the sampling site procedures outlined and without flushing the main, two sets of samples a minimum of 15 min apart while the sampling taps are left running. Joints of pipe in the trench shall be completed before work is stopped.
The preferred equipment for applying liquid chlorine gas is a solution-feed, vacuum-operated chlorinator and a booster pump. All connections shall be checked for tightness before the solution is applied to the main. Water Main Break Guidance Manual epa. Inspecting and cleaning, followed by awws of spraying or swabbing with a minimum 1 percent chlorine solution: Henderson, Consultant, Concord, Mass.
If chemical contamination occurs, such as a hydraulic oil leak or c615-05 product spill, the pipe sections qwwa to the contamination should be replaced and not reused for potable water applications. The party that provides the work and materials for placement or installation. Sealing aawwa or gaskets shall be handled in a manner that avoids contamination.
It cannot be used in large-diameter mains if it is necessary for a worker to enter the main to grout joints or perform inspection because the tablets may release toxic fumes after exposure to moist air.
What is that symbol. In this situation, activities are well controlled and a full shutdown is not needed, thus maintaining positive pressure to the area of shutdown and around the break aswa at all times.
In any case of conflict, the requirements of this standard shall prevail. If the initial disinfection fails to produce satisfactory bacteriological results, or if other results indicate unacceptable water quality, the main may be reflushed and shall be resampled.
AWWA C651-14 Disinfecting Water Mains
Although this assessment is unique for each system, parameters considered for testing include disinfectant residual, total coliform bacteria, HPC, turbidity, pH, alkalinity, total chlorine, odor, and specific conductance. If allowed by local regulations, the pipeline may be returned to limited service prior to obtaining bacteriological results with proper notification of the affected customers.
Dechlorination equipment may swwa be capable of handling high flows with high levels of chlorine. The interiors of pipes, fittings, and valves shall be protected from contamination. The water main is then returned to service with flushing to obtain three volumes of water turnover, making sure that the flushed water is visually clear.
Before approving a main for release, take an initial set of samples and then resample again after a minimum of 16 hr using the sampling site procedures outlined. The chlorine concentration is uniform throughout the main.
This figure applies to pipes up to and including 8-in.