(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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Documents Flashcards Grammar checker. This edition approved June 8, It is not a specification.
AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifications. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until each optional feature is specified by the user, the product or service is not fully defined. AWWA publication of a standard does not constitute endorsement of any c61-05 or product type, nor does AWWA test, certify, or approve any product.
The use of AWWA standards is entirely voluntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or codes of any governmental authority. AWWA standards are intended to represent a consensus of the water supply industry qwwa the product described will provide satisfactory service. C615-05 action becomes effective on the first day of the month following the month of Journal – American Water Works Association publication of the official notice.
American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American Awwz Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does c651-0 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.
AWWA C651-14 Disinfecting Water Mains
American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility awda advertising and promotional materials or on tags or labels that the goods are produced in conformity with particular American National Standards.
This American National Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of ANSI approval. Revenue from the sales of this AWWA material supports ongoing product development.
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 c51-05 excerpts or quotations for review purposes, without the written permission of the publisher.
Hagar, Carollo Engineers, Phoenix, Ariz.
Henderson, Consultant, Concord, Mass. Vidika, Dixon Engineering Inc. Wailes, Consultant, Black Hawk, Colo. Gordhamer, Measurement Technologies Inc. Smith, Smith LaSalle Inc. Some variations from this format may be found in a particular standard.
A Information on Application of This Standard A Purchaser Options and Alternatives B Modification to Standard 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.
The disinfecting agents discussed in this standard are chlorine solutions that may be derived from liquid chlorine Cl2calcium hypochlorite Ca OCl 2or sodium hypochlorite NaOCl.
Combinations of free chlorine residual and contact time are provided. Chlorine dosage reference tables are provided as appendix B of this standard. This standard was first approved on Sept.
Revisions were approved on Sept. This edition was approved on June 8, In the United States, authority to regulate products for use in, or in contact with, drinking water rests with individual states. Specific policies of the state or local agency. Individual states or local agencies have authority to accept or accredit certification organizations within their jurisdictions.
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Accreditation of certification organizations may vary awws jurisdiction to x651-05. Use of Annex A procedures may not always be identical, depending on the certifier. Thus, users of this standard should consult awwz appropriate state or local agency having jurisdiction in order to 1.
Determine additives requirements including applicable standards. Determine the status of certifications by parties offering to certify products for contact with, or treatment of, drinking water. Determine current information on product certification. Information on Application of This Standard. C6551-05, it is easier to disinfect a new main than one that has had emergency repairs in terms of access, sanitary control, and the time available for disinfection, sampling, and testing.
For a new main, there is typically more time available for disinfection and testing since there is no immediate demand from customers. Given c615-05 often significant amount of time and materials involved in a new water main project, careful disinfection and testing of the main are reasonable and necessary to ensure public health protection.
Conditions for pipe repair projects vary tremendously in terms of the size of the repair, the sanitary conditions, and the time c65105 resulting from immediate customer demands. It should be noted if the line is depressurized or opened to the environment prior to or during repair, the sanitary integrity of the pipe is compromised and it is critical to follow sanitary procedures throughout the repair—not just as it is being returned to service.
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.
Because of the differences between initial installation and repair, the disinfection requirements for each situation are also different. The installation of new mains requires that two sets of samples for coliform analysis are collected at least 16 hr apart, or two sets collected 15 aswa apart after at least a hr rest period.
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 c651-50 apart after a hr rest period.
The purpose of this change is to consider the balance between public health, awwwa test methods, and timely work completion. This timing is sufficient to allow bacterial regrowth within the line if awaw was a contamination problem and provides more flexibility in the scheduling of various work activities. Bacteriological testing in accordance with Sec. Failure to pass the bacteriological test requires that the flushing or disinfection process be repeated.
It must be remembered that the final water quality test is not the primary means for certifying the sanitary condition of a main. Four methods of disinfecting newly constructed water mains are described in this standard: The utility should decide which of these methods is most suitable c651-5 a given situation.
Factors to consider when choosing a method should include the length and diameter awwx the main, type of joints present, availability of materials, equipment required c65105 disinfection, training v651-05 the personnel who will perform the disinfection, and safety concerns.
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. Thorough consideration should be given to the impact of highly chlorinated water flushed into the environment.
If there is any question that damage may be caused by chlorinated-waste discharge to fish life, plant life, c651–05 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.
The tablet method cannot be used unless the main can be kept clean and dry. 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.
When using the tablet method, the chlorine concentration is not uniform throughout the main because the hypochlorite solution is dense and tends to concentrate at the bottom of the pipe. The use of the tablet method precludes preliminary flushing. The tablet method is convenient to use in mains having diameters up to 24 in.
The continuous-feed method is suitable for general application. Preliminary flushing removes light particulates from the main but not from the pipe-joint spaces. The chlorine concentration is uniform throughout the main. The slug method is suitable for awwaa in large-diameter mains where the volume of water awwaa the continuous-feed method impractical and difficult to achieve for short attachments.
The slug method results in appreciable savings of chemicals used to disinfect long large-diameter mains. Also, this method reduces the volume of heavily chlorinated water to be flushed to waste. 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.
This method reduces the volume of heavily chlorinated water to be flushed to waste. The purpose of all four chlorination methods is to disinfect water lines, resulting in an absence of coliforms as confirmed by laboratory analysis. As noted above, the four methods attempt to provide flexibility in responding to specific situations. While the contact times of awda methods may not be identical, the end result, absence of coliforms, is the same for all four methods.
Disinfectants other than chlorine may be appropriate to use. Although this standard describes only the use of liquid chlorine gassodium hypochlorite solutions, and calcium hypochlorite, the applicability of other disinfectants should be evaluated.
Ozone and chemical cleaners have been c651-055, and these warrant further investigation. Whichever disinfectant or method is selected, approval from the local regulatory agency may be required.
Use of This Standard. 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. Purchaser Options and Alternatives. The following information should be provided by the purchaser.
Approval requirements before use. Those procedures included in the standard that are designated as optional, that are to be included in the purchase documents. Details of other federal, state or provincial, and local requirements Section 4. Form of chlorine to be used Sec.
Method of chlorination Sec. Flushing locations, rates of flushing, and locations of drainage facilities Sec. Responsibility for tapping wawa mains and connections to new mains Sec.
The number and frequency of samples for bacteriological tests Sec.