(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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In their latest editions, they form a part of this standard to the extent specified within the standard. The person, company, or organization that purchases any materials or work to be performed. What is that symbol. Drainage should take place away from the construction or work area. Since this is a threshold velocity, 3.
American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions.
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Also, at least one tablet shall be awwq in each hydrant branch and in other awwz. For larger mains, pigging or other suitable method acceptable to the purchaser is an option in place of high-velocity flushing. Between the time the satisfactory bacteriological sample results are received and the time that the connection piping is installed, the ends of the piping must be sealed with plastic wraps, watertight plugs, or caps.
Determine the status of certifications by parties offering to certify products for contact with, or treatment of, drinking water.
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.
For repaired mains that are maintained under pressurized conditions at all times, bacteriological testing is not required When required, samples are now specified to be collected at least 16 hr apart, or 15 min apart after a hr rest period. Crews responsible for the repair of mains should be aware of the potential health hazards and be trained to carefully observe prescribed construction practices and disinfection procedures.
Yarning or packing material shall consist of molded or tubular rubber rings, rope of treated paper, or other approved materials. The use of AWWA standards is entirely voluntary. Additionally, any accessible upstream and downstream interior of the existing pipe should be disinfected by swabbing or spraying with a minimum 1 percent chlorine solution.
Precautions shall be taken to ensure that air pockets are eliminated. Inspecting and cleaning, followed by disinfection of spraying or swabbing with a minimum 1 percent chlorine solution: For very-large-diameter pipe where personnel may safely enter the pipein lieu of flushing following disinfection, the interior of the pipe at the repair site may be cleaned by sweeping or high pressure wash using potable water before disinfection.
The pipeline may be returned to service prior to obtaining bacteriological results. This standard describes methods of disinfecting newly constructed potable water mains; mains that have been removed from service for planned repairs or for maintenance that exposes them to contamination; mains that have undergone emergency repairs because of physical failure; and mains that, under normal operation, continue to show the presence of coliform organisms.
There should be no water in the trench up to the connection for sampling.
Figure 1 applies to pipes with diameters 4 in. Standing water and debris from the cleaning must be removed from x651-05 pipe prior to disinfection. It should be recognized that the primary means of ensuring the sanitary integrity of a main are the sanitary handling of materials, the practices during repair work, and continual inspection of work. Attach tablets inside and at the top of the main.
As appropriate, advising affected customers to adequately flush their service lines upon return to service. Also called free available chlorine, the amount of chlorine available as dissolved gas Cl2hypochlorous acid HOCland hypochlorite OCl— that is not combined with ammonia NH3 or other compounds in water that c65105 available for disinfection.
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Dechlorination equipment may not be capable of handling high flows with high levels of chlorine. Clarified differences in the requirements between new and repaired awwq foreword II. It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. Water mains taken out of service for inspection, repair, or other activities may or may not require disinfection and sampling, depending on the risk of contamination.
Some variations from this format may be found in a particular standard. If direction of flow is not known, samples shall be collected on either side of the repair site.
AWWA C651-14 Disinfecting Water Mains
Those procedures included in the standard that are designated as optional, that are to be included in the purchase documents.
An American National Standard is intended as a guide to f651-05 the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standard. Option A samples are 16 hr apart, and X651-05 B samples are 15 min apart after a hr rest period foreword II.
Solutions with a minimum 1 percent chlorine concentration may be prepared with sodium hypochlorite or calcium hypochlorite. Use of Annex A procedures may not always aswa identical, depending on the certifier.
After the applicable retention period, heavily chlorinated water should not remain in prolonged contact with pipe. Changed the requirement for bacteriological sampling in new mains from two sets of samples 24 hr apart to add two options for two sets c651-50 samples: A comparator kit containing a suitable range of standards.
Samples shall be taken of water that has stood in the new main for at least 16 hr after final flushing has been completed.