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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An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public.

Makeshift equipment is not c651-005 when liquid chlorine gas cylinders are used.

Feed lines shall be made of material capable of withstanding the corrosion caused by the concentrated chlorine solutions and the maximum pressures that may be created by the pumps. Removing, by flushing or other means, those materials that may have entered the water main or appurtenances. Attach tablets inside and at the top of the main.

Changed the requirement for bacteriological sampling in new mains from two f651-05 of samples 24 hr apart to add two options for two sets of samples: Where necessary, federal, state, local, or provincial regulatory agencies should be contacted to determine special provisions for the disposal of heavily chlorinated water.

C51-05 Water Main O n Feb. New water mains shall be disinfected before they are placed in service.

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Specific policies of the state or local agency. Before the main is chlorinated, it shall be filled with potable water to eliminate air pockets and flushed to remove particulates. The main should undergo hydrostatic testing prior to disinfection. If dirt enters the pipe, it shall be removed and the interior pipe surface swabbed with a minimum 1 percent free chlorine disinfecting solution. Therefore, the procedures of this section must be observed to ensure that a water main and its appurtenances have been thoroughly cleaned for the final disinfection by chlorination.

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The spray method is suitable for use in large-diameter transmission lines where spray equipment can be used to disinfect all surfaces of the pipe. 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.

For example, if gas chlorination is the chosen chemical when either continuous-feed or slug methods are being used, use only properly designed and constructed equipment; makeshift equipment is not acceptable when liquid chlorine gas cylinders are used.

Levels should be as expected or typical for the water system. Dechlorination equipment may not be capable of handling high flows with high levels of chlorine.

This allows backflow of water into the cylinder, resulting in severe cylinder corrosion and the escape of chlorine gas. After the applicable retention period, heavily chlorinated water should not remain in prolonged contact with pipe. Delay in placement of delivered pipe invites contamination.

The awwq liquid chlorine is sometimes used to describe a hypochlorite solution. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifications. Nonetheless, the repair work needs to be accomplished using sanitary and safe procedures by well-trained crews with proper supervision and guidance. Flushing locations, rates of flushing, and locations of drainage facilities Sec.

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AWWA C651-14 Disinfecting Water Mains

Lucie County Department of Health. The free chlorine residual shall be measured in the slug as it moves through the main. Sodium hypochlorite contains approximately 5 percent to 15 percent available chlorine, and the storage conditions and time must be controlled to minimize its deterioration.

If there is any question that damage may be caused by chlorinated-waste discharge to fish life, plant life, physical installations, or other downstream water c651-055 of any typethen an adequate amount of reducing agent should be applied to water being disposed of in order to thoroughly neutralize the chlorine residual remaining in the water.

When dechlorination is required, it is recommended that any high-velocity flushing be completed prior to disinfection.

Purchaser Options and Alternatives. This figure applies to pipes up to and including 8-in.

If water accumulates in the trench, the plugs shall remain in place until the trench is free of standing water and mud that may enter wwwa pipe.

Packing material shall be handled in a manner that avoids contamination. Chlorine dosage reference tables are provided as appendix B of this standard. Inspecting and cleaning, followed by disinfection of spraying or swabbing with a minimum 1 percent chlorine solution: