AWWA C651 FREE DOWNLOAD

The pipettes should not be interchanged. The update takes into account the findings from a recent project from the Water Research Foundation Project No. Table 3 shows the rates of flow required to produce a velocity of 3. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information or retrieval system, except in the form of brief excerpts or quotations for review purposes, without the written permission of the publisher. 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. Preventing contaminating materials from entering the water main during storage, construction, or repair and noting potential contamination at the construction site. This figure applies to pipes up to and including 8-in.

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AWWA C Disinfecting Water Mains

There should be no water in the trench up to the connection for sampling. American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions.

For larger-diameter pipe 12 in. The vacuum-operated chlorinator mixes the chlorine gas in solution water; the booster pump then injects the chlorine solution into the main to be disinfected. No contaminated material or any material capable of supporting growth of microorganisms shall be used for sealing joints.

Drainage should take place away from the construction or work area. 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. Tablets dissolve in approximately 7 hr and must be given adequate contact time.

Standing water and debris from the cleaning must be removed from the pipe prior to disinfection. Solutions with a minimum 1 percent chlorine concentration may be prepared with sodium hypochlorite or calcium hypochlorite. 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. Add to collection s Add to saved.

No bacteriological testing is necessary. Inspecting and cleaning, followed by disinfection of spraying or swabbing with a minimum 1 percent awwx solution: The planned, unplanned, or emergency repair of a water main or appurtenance e. Potable water shall be used for disinfection, hydrostatic pressure testing, and flushing.

Disinfection should be accomplished by the procedures in Sec.

Materials such as jute or hemp shall not be used. The cross-connection control device shall be consistent with the degree of hazard for backflow protection of the active distribution system see Figure 1. 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.

Wailes, Consultant, Black Hawk, Colo. This standard was first approved on Sept. The more closely the rate of delivery is correlated to the rate of pipe laying, the lower the risk of contamination. A combination of free chlorine, awa chlorine, and organochlorine species. A suggested combination blowoff and sampling tap used for mains up to and including 8-in.

Any modification of the provisions, definitions, or terminology in this standard must be provided by the purchaser. Calculate the milligrams per liter of free residual chlorine as follows: The procedures described in Sec. Table 2 shows the number of tablets required for commonly used sizes of pipe. Since this is a threshold velocity, 3. Calcium hypochlorite granules shall be placed at the upstream end of the first section of pipe, at the upstream end of each branch main, and at ft m intervals.

AWWA C651-14 Disinfecting Water Mains

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 uses 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.

If, in the opinion of the purchaser, the dirt remaining in the pipe will not be removed using the flushing operation, the interior of the pipe shall be cleaned using mechanical means, such as a hydraulically propelled foam pig or other suitable device acceptable to the purchaser in conjunction with the application of a minimum 1 percent free chlorine disinfecting solution.

The party that manufactures, fabricates, or produces materials or products. 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. You can add this document to your saved list Sign in Available only to authorized users.