1、The Authoritative Resource for Safe WaterANSI/AWWA C620-07(First Edition)AWWA StandardEffective date: Oct. 1, 2008.This first edition approved by AWWA Board of Directors June 24, 2007.Approved by American National Standards Institute July 29, 2008.Spray-Applied In-Place Epoxy Lining of Water Pipelin
2、es, 3 In. (75 mm) and Larger6666 West Quincy AvenueDenver, CO 80235-3098T 800.926.7337www.awwa.orgAdvocacyCommunicationsConferencesEducation and TrainingScience and TechnologySectionsiiAWWA StandardThis document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA
3、standardsdescribe minimum requirements and do not contain all of the engineering and administrative information normallycontained in specifications. The AWWA standards usually contain options that must be evaluated by the user of thestandard. Until each optional feature is specified by the user, the
4、 product or service is not fully defined. AWWApublication of a standard does not constitute endorsement of any product 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 takeprecedence over or disp
5、lace any applicable law, regulation, or codes of any governmental authority. AWWA standardsare intended to represent a consensus of the water supply industry that the product described will provide satisfactoryservice. When AWWA revises or withdraws this standard, an official notice of action will b
6、e placed on the first page ofthe classified advertising section of Journal AWWA. The action becomes effective on the first day of the month followingthe month of Journal AWWA publication of the official notice.American National StandardAn American National Standard implies a consensus of those subst
7、antially concerned with its scope and provisions. AnAmerican National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. Theexistence of an American National Standard does not in any respect preclude anyone, whether that person hasapproved the standard or
8、not, from manufacturing, marketing, purchasing, or using products, processes, or proceduresnot conforming to the standard. American National Standards are subject to periodic review, and users are cautionedto obtain the latest editions. Producers of goods made in conformity with an American National
9、 Standard areencouraged to state on their own responsibility in advertising and promotional materials or on tags or labels that thegoods are produced in conformity with particular American National Standards.CAUTION NOTICE: The American National Standards Institute (ANSI) approval date on the front
10、cover of this standardindicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn atany time. ANSI procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than fiveyears from the date of publication. Purchaser
11、s of American National Standards may receive current information on allstandards by calling or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York,NY 10036; (212) 642-4900.All rights reserved. No part of this publication may be reproduced or transmitted in
12、any form or by any means, electronicor mechanical, including photocopy, recording, or any information or retrieval system, except in the form of briefexcerpts or quotations for review purposes, without the written permission of the publisher. Copyright 2008 by American Water Works AssociationPrinted
13、 in USAiiiCommittee PersonnelThe AWWA Standards Committee on Pipe Rehabilitation, which developed and approvedthis standard, had the following personnel at the time of approval:Edward O. Norris, ChairDarin H. Thomas, Vice-ChairGeneral Interest MembersD.T. Bradley,*Standards Council Liaison, Oak Lodg
14、e Water District, Milwaukie, Ore. (AWWA)R.W. Bonds, Ductile Iron Pipe Research Assoc., Birmingham, Ala. (AWWA)P. Glus, Malcolm Pirnie Inc., Jackson Heights, N.Y. (AWWA)T.J. Hodnik, Nies Engineering Inc., Hammond, Ind. (AWWA)T.D. Humphrey, Winzler limits of pipeline shutdowns, if servicerequirements
15、make limits necessary; location of access manholes, location, type, andxsize of valves; location of interconnecting pipelines, hydrant branches, and servicepipes; location of fittings and restrictions that could interfere with cleaning and liningoperations; location, diameter, and connections of tem
16、porary bypass, if required; andother details of the pipe within the scope of the contract between the purchaser andthe contractor.3. Characteristics of epoxy lining. Nominal dry film thickness (DFT) ofepoxy lining requiredgenerally 40 mil (1 mm) and minimum cure time of epoxybetween epoxy applicatio
17、n and reintroduction of water into the pipe.4. Services furnished by purchaser. Description of services or field operationsto be performed by the purchaser, such as locating the main to be cleaned and lined,removal and replacement of line valves, operation of valves, tagging valves that sepa-rate th
18、e main to be cleaned and lined from the water system to prevent accidentalopening, shutting off inflow of water from connecting pipelines, locating and operat-ing blowoffs, connecting and disconnecting temporary bypasses to customer services,obtaining permits required for the work, handling customer
19、 contacts, disinfection,and conducting flow tests.5. Additional work to be performed by constructor. Description of work,including repairs to deteriorated pipe, excavation, backfill, and resurfacing work ataccess excavations; method of opening and closing access openings in the pipeline;flushing, la
20、ying, and removing temporary bypass pipe; and operation of main line orblowoff valves.NOTE: When it is necessary to repair deteriorated pipe before lining, the pipe willbe repaired by the purchaser or under provisions of the contract between thepurchaser and the constructor.6. Water for cleaning and
21、 lining operations. Location of water sources,method of providing, quantity available, and pressure information.7. Disposal of cleaning water and debris. Requirements for the disposal ofcleaning water, old lining, and other debris; instructions regarding permits from theresponsible authorities.8. Pu
22、rchaser options. Options that may be specified by the purchaser:a. Affidavit of compliance.b. Access openings and pavement repairs.c. Traffic control.d. Cleaning of valves, installing new bolts and gaskets.e. Temporary bypass.xif. Disinfection of temporary bypass.g. Replacing/repairing faulty/leakin
23、g valves.h. Cathodic protection.i. Service box repairs.j. Meter upgrades.k. Hydrant replacement.9. Rejection of work. The purchaser should specify a procedure for reportingthe rejection of work not performed in accordance with this standard. The purchasershould also outline the responsibility of the
24、 purchaser and the constructor in cases ofnonstandard work.10. Warranty period. The purchaser should specify the duration of the war-ranty period and warranty inspection protocols and outline the responsibility of thepurchaser and the constructor in cases of nonconforming work discovered during thew
25、arranty period.III.B. Modification to Standard. Any modification to the provisions, defini-tions, or terminology in this standard must be provided by the purchaser. IV. Major Revisions. This is the first edition of this standard.V. Comments. If you have any comments or questions about this standard,
26、please call the AWWA Volunteer however, lining of lateral portions of pipe fittingsis not achieved. Such fittings are commonly removed and often used as access points.4.2.2 Determining access points. The purchaser and the constructor shalldetermine together the location of the access openings necess
27、ary to perform thework. Generally, valve, tee, and cross locations are chosen that facilitate thereplacement of these appurtenances if necessary. Access openings necessary for thelining work shall be prepared and closed by the constructor. Traffic control shall beas specified by the purchaser.4.2.3
28、Preparing surface. The pipe interior shall be sound and free ofcorrosion by-products; chemicals or other deposits; loose and deteriorated remains ofold coating materials; and oil, grease, and accumulations of water, dirt, and debris.Any technique may be used to clean the pipe as long as it leaves th
29、e pipe bore smoothand free of corrosion debris. Care shall be taken to ensure standing water is removedand that the section of pipe to be lined is isolated from the rest of the network. Inpractice, power boring, drag cleaning, or abrasive pigging followed by foam swabbingis an effective means to pre
30、pare the pipe.4.2.4 Method of applying epoxy. The epoxy shall be mixed and applied usinga manufacturers approved system and a manufacturer-approved material, process,and equipment, including a specially designed spray head that applies the liningcentrifugally. Unmixed or uncured resin and hardener m
31、ay represent a chemicalhazard. For safety aspects, refer to material safety data sheets (MSDS) available fromthe chemical supplier or manufacturer.4.2.5 Application temperatures. The manufacturers recommendations forboth minimum and maximum application temperatures for applying epoxy shall befollowe
32、d.4.2.6 Number of coats and film thickness. One coat is recommended with aminimum dry film thickness of 40 mil (1 mm).*Thickness is generally verified by acalculation of material applied per surface area. The wet film thickness (WFT)should be measured with a wet film thickness gauge at both ends of
33、the pipe. Atpurchaser discretion, thickness measurement may be taken with random sampling byextracting spool pieces or coupons of pipe after curing.*Metric conversions stated in this standard are direct conversions of US customary units and are notthose specified in the International Organization fo
34、r Standardization (ISO) standards.SPRAY-APPLIED IN-PLACE EPOXY LINING OF WATER PIPELINES 54.2.7 Overlining. If it is necessary to apply an overlining, the first coat ofepoxy must be cured before the second coat is applied as recommended in themanufacturers guidelines. Manufacturer guidelines must al
35、so prescribe a maximumdrying time and additional preparation needed if an overlining coat is required.Sec. 4.3 Procedures for Applying Epoxy Lining to Water Mains4.3.1 Cutting the existing pipe. The existing pipe shall be cut to provideaccess for the cleaning and lining operations. Generally, a shor
36、t section is removedfrom the pipe, usually with the removal of valve or fitting, to allow entry ofequipment. If one side of the pipeline has to be capped and repressurized during thecleaning and lining operations, the constructor shall block, brace, tie back, orotherwise ensure that the pressurized
37、pipeline remains in service.4.3.2 Cleaning the pipe sections. The interior surfaces of the pipe to be linedshall be cleaned by methods approved by the purchaser to remove corrosion products;chemicals or other deposits; loose and deteriorated remains of old coating materials;and oil, grease, and accu
38、mulations of water, dirt, and debris. If flushing water is usedfor cleaning, the constructor shall collect and dispose of the water after consulting withthe purchaser and in accordance with the regulating organization. Generally, cleaningdebris is deposited into a sump in the access pit. However, de
39、pending on the quantityof scale being removed, a sediment tanker may be required. Disposal of effluent andsolids shall be made in accordance with regulatory disposal requirements.4.3.3 Drying the pipe interior. The constructor shall ensure that residualwater and debris are removed from the pipe prio
40、r to lining. Water and debris may beremoved by pulling rubber disk squeegees through the pipe, but they are normallyremoved by swabbing. Oversized foam swabs can be driven through the main usingfiltered compressed air. The filters must be capable of removing the compressor oiland must be checked and
41、 cleaned regularly. The number of swab passes requireddepends on the condition of the main, but swabbing must continue until the swabsemerge clean and dry. The constructor shall observe manufacturer recommendationson dehumidifying the pipe, if any. The presence of substantial amounts of debris orwat
42、er suggests inadequate cleaning or leaking valves. These faults should beinvestigated and remedied before epoxy lining begins.4.3.4 Inspecting pipe with a CCTV before lining. The constructor shallinspect the cleaned pipe throughout the length to be lined with a closed circuittelevision (CCTV) system
43、. The television equipment should be dedicated to potable6 AWWA C620-07water main service only. If there is concern about contamination from equipment,the constructor shall disinfect all parts of the equipment before insertion into thepipe.The CCTV system camera shall be specifically designed and co
44、nstructed forpipe inspection. The camera should provide the flexibility in examining pipe details,especially joints and service connections extending into the pipe. The lighting systemshall be capable of lighting the full periphery of the pipe. The camera shall provide acolor picture.The interior su
45、rfaces of the pipe must be clean and free of excessive or standingwater before the epoxy lining is applied. Additional drying may be required as afunction of the epoxy product. Service connections must be carefully inspected toensure that there is no debris blocking any service taps and there is no
46、inflow of waterinto the pipe. If any services are leaking, appropriate steps must be taken to stop theleak to a drip-tight condition. A video recording shall be made of the entireinspection and submitted to the purchaser prior to lining. If the initial videoinspection reveals significant issues and
47、resolution is not clear, the CCTV inspectionmay be repeated.4.3.5 Applying epoxy lining. Only equipment that has been approved by theepoxy manufacturer to apply the epoxy lining to the interior surface of the pipe shallbe used. Before the epoxy is actually applied, the constructor shall demonstrate
48、thatthe equipment is functioning properly by recirculating the resin and hardener in theepoxy lining machine. Temperature of the raw materials and weight ratio of thepumped material shall be verified (by weight or volume) to be within themanufacturers tolerances.After pulling the hoses through the l
49、ength of pipe to be lined and attaching thelining head, the constructor shall “spin-up” the lining head to its operating rotationspeed and sample the mixed epoxy for the uniform color expected of a thoroughlymixed resin and hardener. The weight ratios of the resin and hardener shall becontinuously monitored.Once the operation of the epoxy lining machine has been proven, the winchshall be started and the lining head drawn back through the pipe at a speed that iscalibrated to leave a minimum 40 mil (1 mm) thickness of epoxy uniformlydistributed on the interior pipe surface. The entire pr
