ANSI AWWA C603-2005 Installation of Asbestos - Cement Pressure Pipe《石棉安装.水泥压力管》.pdf

1、The Authoritative Resource on Safe WaterSMANSI/AWWA C603-05(Revision of ANSI/AWWA C603-96 R00)AWWA StandardEffective date: May 1, 2005.First edition approved by AWWA Board of Directors Jan. 27, 1964.This edition approved Jan. 16, 2005.Approved by American National Standards Institute Feb. 25, 2005.I

2、nstallation of AsbestosCement Pressure PipeAdvocacyCommunicationsConferencesEducation and TrainingH17012 Science and TechnologySections6666 West Quincy AvenueDenver, CO 80235-3098T 800.926.7337www.awwa.orgCopyright American Water Works Association Provided by IHS under license with AWWANot for Resal

3、eNo reproduction or networking permitted without license from IHS-,-,-iiAWWA StandardThis document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standardsdescribe minimum requirements and do not contain all of the engineering and administrative information n

4、ormallycontained 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 product or service is not fully defined. AWWApublication of a standard does not constitute endorsement of any pr

5、oduct or product type, nor does AWWA test, certify,or approve any product. The use of AWWA standards is entirely voluntary. AWWA standards are intended to represent aconsensus of the water supply industry that the product described will provide satisfactory service. When AWWA revisesor withdraws thi

6、s standard, an official notice of action will be placed on the first page of the classified advertisingsection of Journal AWWA. The action becomes effective on the first day of the month following the month of JournalAWWA publication of the official notice.American National StandardAn American Natio

7、nal Standard implies a consensus of those substantially 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, w

8、hether that person hasapproved the standard or 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 goo

9、ds made in conformity with an American National 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 Standar

10、ds Institute (ANSI) approval date on the front 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 fi

11、veyears from the date of publication. Purchasers 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.Science and TechnologyAWWA unites the

12、entire water community by developing and distributing authoritative scientific and technologicalknowledge. Through its members, AWWA develops industry standards for products and processes that advance publichealth and safety. AWWA also provides quality improvement programs for water and wastewater u

13、tilities.All rights reserved. No part of this publication may be reproduced or transmitted in 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

14、written permission of the publisher. Copyright 2005 by American Water Works AssociationPrinted in USACopyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiCommittee PersonnelThe AWWA Sta

15、ndards Committee on AsbestosCement Pressure Pipe, which reviewedand approved this standard, had the following personnel at the time of approval:Leo A. Kinney, Jr., ChairBobby J. Pigg, SecretaryGeneral Interest MembersMarcel Cossette, Asbestos Expertise, Sherbrooke, Que. (AWWA)R.C. Graff, Consultant,

16、 Poway, Calif. (AWWA)L.A. Kinney Jr., Consultant, Lakewood, Colo. (AWWA)P.J. Olson,*Standards Engineer Liaison, AWWA, Denver, Colo. (AWWA)W.R. Perrell, Consultant, Birmingham, Ala. (AWWA)K.E. Wilson,*Standards Council Liaison, PBS andelastomers, such as used in jointing gaskets and packing glands, a

17、re subject topermeation by lower molecular weight organic solvents or petroleum products. If awater pipe must pass through such a contaminated area or an area subject tocontamination, consult with the manufacturer regarding permeation of pipe walls,jointing materials, etc., before selecting material

18、s for use in that area.Sec. 4.3 Alignment and GradePipe shall be laid to and maintained at the lines and grades required by thepurchaser. Fittings, valves, air vents, and hydrants shall be installed at the requiredlocations with joints centered, spigots home, and valve and hydrant stems plumb. Nodev

19、iation shall be made from the required line or grade without approval of thepurchaser.Copyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 AWWA C603-05Sec. 4.4 Excavation and Preparation

20、 of TrenchThe trench shall be excavated to the required alignment and depth shown onthe purchasers drawings or as subsequently required in writing by the purchaser, andonly so far in advance of pipe laying as permitted by the purchaser.4.4.1 Excavation methods. When necessary to prevent caving, tren

21、ch excava-tions shall be sheeted and braced or sloped according to applicable laws andordinances. When sheeting and bracing are used, the trench width shall not be lessthan that specified in Sec. 4.4.2. As backfill is placed and sheeting is withdrawn, thesheeting shall be withdrawn vertically in inc

22、rements of not more than 1 ft (0.3 m),and the void left by the withdrawn sheeting shall be filled and compacted before thenext increment is withdrawn. Excavated material shall be piled in a manner that willnot endanger the work or obstruct sidewalks and driveways. Gutters shall be keptclear or other

23、 provisions made for surface drainage.4.4.2 Trench width. The trench width shall be ample to permit the pipe tobe laid and jointed properly and the backfill to be placed and compacted as specifiedby the purchaser. Trenches shall be of such extra width, when required, to permit theconvenient placing

24、of timber supports and sheeting and bracing, as well as thehandling of specials.4.4.3 Trench preparation. The trench shall be prepared for the directplacement of the pipe. This preparation includes digging coupling holes in the trenchbottom or bedding. (Illustrations of the various bedding condition

25、s are presented inANSI/AWWA C401 and ANSI/AWWA C403.)4.4.4 Excavation in poor soil and refilling to grade. Any part of the trenchexcavated below grade shall be backfilled to grade with thoroughly compactedmaterial acceptable to the purchaser. When an unstable subgrade condition isencountered and, in

26、 the opinion of the purchaser, it cannot support the pipe, anadditional depth shall be excavated and refilled to pipe foundation grade withcrushed stone or other suitable material as required by the purchaser to achieve asatisfactory trench bottom.4.4.5 Pipe laid on trench bottom or bedding. Before

27、the pipe is lowered intothe trench, the constructor shall1. Excavate a coupling hole having sufficient length, width, and depth topermit assembly and provide a minimum clearance of 2 in. (50 mm) below thecoupling.2. Provide the pipe with continuous support between coupling holes.Copyright American W

28、ater Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INSTALLATION OF ASBESTOSCEMENT PRESSURE PIPE 5NOTE: Use of cohesionless, free-draining material for bedding is recommendedas a preferred method of preparin

29、g the trench bottom for pipe installation.Sec. 4.5 Laying of Pipe4.5.1 Lowering of pipe and accessories into trench. Pipe shall not be loweredinto the trench until the pipe bedding material has been brought to grade. Pipe andaccessories shall be inspected for defects. Dirt and other foreign matter s

30、hall beremoved from the interior and the machined ends of the pipe before it is loweredinto the trench. Pipe and accessories shall be lowered carefully into the trench byhand or with suitable equipment in a manner that will prevent damage to pipe andfittings or injury to the installers. The sealing

31、surfaces of all materials shall be keptclean during installation.4.5.2 Pipe joints. The machined ends of pipe to be jointed, couplinggrooves, and rubber rings shall be cleaned immediately before assembly, and assemblyshall be made as recommended by the manufacturer. CAUTION: Do not reverse thegasket

32、 when placing it in the coupling. Each pipe joint shall be sealed with a couplingconsisting of an asbestoscement sleeve and two rubber rings or an equivalentcoupling or joint of equivalent strength and performance. The pipe joint shall not bedeflected either vertically or horizontally beyond the lim

33、its recommended by themanufacturer.4.5.2.1 When pipe laying is not in progress, the open ends of installed pipeshall be closed to prevent the entrance of water into the line.4.5.2.2 Whenever water is in the pipe trench, enough backfill shall be placedon the pipe to prevent it from floating. Any pipe

34、 that has floated shall be removedfrom the trench and the bedding shall be corrected to conform to Sec. 4.4.3. No pipeshall be laid when the weather is unsuitable for proper installation, as determined bythe purchaser.4.5.3 Closure system. Closure lengths and closure couplings should be usedfor tyin

35、g in asbestoscement pipe. Closure lengths and closure couplings can spanclosure distances up to 13 ft (3.96 m) without any field cutting. They eliminate anypossible airborne asbestos fiber exposure, which may result from the field cutting ofpipe.4.5.4 Pipe cutting. Since the introduction of the clos

36、ure system, pipe cuttingis no longer required in the field. If pipe cutting is performed, methods that produce asmooth square-cut end, without damage to the pipe, and that do not produce airborneCopyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reprod

37、uction or networking permitted without license from IHS-,-,-6 AWWA C603-05particles, shall be employed. Abrasive discs are prohibited unless they are equipped withlocal exhaust ventilation and a high-efficiency particulate air (HEPA) filter dustcollection system.4.5.5 End preparation. Whenever it is

38、 necessary to cut a length of pipe in thefield, the end shall be prepared as follows:4.5.5.1 The pipe end of random lengths shall be machined by commerciallyavailable field lathes designed to ensure that the diameter, profile, and roundnessmeet the pipe manufacturers specifications. The machined sur

39、face on which thecompression ring seals shall be smooth and cylindrical to ensure joint integrity.4.5.5.2 The pipe end of machined overall lengths shall be beveled accordingto the pipe manufacturers specifications.4.5.6 Length of pipe at fittings and rigid structures. Where rigid joints areformed by

40、 caulked materials or by bolts with rubber-ring seals, such as at fittings, thelength of 8-in. (200-mm) diameter and smaller pipe fitted into the bell of the fittingsshall not exceed 3 ft 3 in. (1 m); the length of 10-in. (250-mm) diameter and largerpipe shall not exceed 6 ft 6 in. (2 m). At least o

41、ne flexible joint shall be used betweentwo adjacent rigid joints. A coupling shall be cast in the wall of rigid structures at thepoint of entry of pipelines to provide flexibility at the wall. To provide additionalflexibility, the pipe at the point of entry shall have a laying length of not more tha

42、n6 ft 6 in. (2 m).Sec. 4.6 Jointing of Pipe to Valves, Hydrants, and Fittings4.6.1 General. Each valve, hydrant, or fitting connected to asbestoscementpipe shall have a profile that permits a seal to be made between the machined pipeand the bell of the fitting with a continuous rubber-ring gasket.4.

43、6.1.1 Before valves, hydrants, or fittings are laid, all lumps, blisters, andexcess coating shall be removed from the bell. The inside of the bell shall then bewire-brushed, and both the inside of the bell and the spigot end of the pipe shall bewiped clean and dry. Surfaces to be jointed shall be ke

44、pt clean until the joints aremade.4.6.2 Push-on joint. The push-on joint is a single rubber-gasket joint. It shallbe assembled by positioning a continuous rubber-ring gasket in the annular groove ofthe fitting bell and pulling the machined pipe end into the bell. A lubricantacceptable to the pipe ma

45、nufacturer must be used. The correct size of gasket for thefitting bell shall be used with the correct size of asbestoscement pipe.Copyright American Water Works Association Provided by IHS under license with AWWANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-INST

46、ALLATION OF ASBESTOSCEMENT PRESSURE PIPE 74.6.3 Mechanical joint. The mechanical joint is a bolted joint of thestuffing-box type. In some sizes and classes, an adaptor is required between theasbestoscement pipe and the mechanical joint. The joints and assembly shallconform to the current revision of

47、 ANSI/AWWA C111/A21.11.Sec. 4.7 Setting of Hydrants, Valves, and Fittings4.7.1 General. Hydrants, valves, and fittings shall be provided and installed asshown on the drawings or as specified by the purchaser. They shall be inspectedcarefully and cleaned as required in Sec. 4.6.1.1 before they are lo

48、wered into the trench.4.7.2 Reaction or thrust blocking. A reaction or thrust block shall be providedat each hydrant, valve, bend, and tee and at reducers or fittings where changes in pipediameter occur. Each block shall be centered on the longitudinal axis and extendedto solid undisturbed ground. H

49、ydrants may be tied to the water main with rods. Thesize and shape of thrust blocks and the number and size of the tie rods shall be asshown on the drawings prepared by the purchaser or as specified by the purchaser.Sec. 4.8 Plugging Dead EndsPlugs shall be inserted into the bells of dead-end fittings. Spigot ends of fittingsand plain ends of pipe shall be capped. A reaction or thrust block shall be providedat dead ends of pipe that are capped or p