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1、The Authoritative Resource on Safe WaterSM ANSI/AWWA C603-05 (Revision of ANSI/AWWA C603-96 R00) AWWA Standard Effective 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,
2、 2005. Installation of Asbestos Cement Pressure Pipe Advocacy Communications Conferences Education and Training ?Science and Technology Sections 6666 West Quincy Avenue Denver, CO 80235-3098 T 800.926.7337 www.awwa.org Copyright American Water Works Association Provided by IHS under license with AWW
3、A Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without license from IHS -,-,- ii AWWA Standard This document is an American Water Works Association (AWWA) standard. It is not a specification. AWWA standards descri
4、be 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 s
5、ervice is not fully defined. AWWA publication 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. AWWA standards are intended to represent a consensus of the water supply i
6、ndustry that the product described will provide satisfactory service. When AWWA revises or withdraws this standard, an official notice of action will be placed on the first page of the classified advertising section of Journal AWWA. The action becomes effective on the first day of the month followin
7、g the month of Journal AWWA 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 National Standard is intended as a guide to aid the manufacturer, the consumer, and
8、 the general public. 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. American National
9、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 in advertising and promotional materials or on tags or labels that the goods a
10、re produced in conformity with particular American National Standards. CAUTION NOTICE:The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at a
11、ny time. ANSI procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards
12、 Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036; (212) 642-4900. Science and Technology AWWA unites the entire water community by developing and distributing authoritative scientific and technological knowledge. Through its members, AWWA develops industry standards for products and
13、 processes that advance public health and safety. AWWA also provides quality improvement programs for water and wastewater utilities. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recordin
14、g, 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. Copyright 2005 by American Water Works Association Printed in USA Copyright American Water Works Association Provided by IHS under licen
15、se with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Committee Personnel The AWWA Standards Committee on AsbestosCement Pressure Pipe, which reviewed and approved this stand
16、ard, had the following personnel at the time of approval: Leo A. Kinney, Jr., Chair Bobby J. Pigg, Secretary General Interest Members Marcel Cossette, Asbestos Expertise, Sherbrooke, Que.(AWWA) R.C. Graff, Consultant, Poway, Calif.(AWWA) L.A. Kinney Jr., Consultant, Lakewood, Colo.(AWWA) P.J. Olson,
17、* Standards Engineer Liaison, AWWA, Denver, Colo.(AWWA) W.R. Perrell, Consultant, Birmingham, Ala.(AWWA) K.E. Wilson,* Standards Council Liaison, PBS and elastomers, such as used in jointing gaskets and packing glands, are subject to permeation by lower molecular weight organic solvents or petroleum
18、 products. If a water pipe must pass through such a contaminated area or an area subject to contamination, consult with the manufacturer regarding permeation of pipe walls, jointing materials, etc., before selecting materials for use in that area. Sec. 4.3Alignment and Grade Pipe shall be laid to an
19、d maintained at the lines and grades required by the purchaser. Fittings, valves, air vents, and hydrants shall be installed at the required locations with joints centered, spigots home, and valve and hydrant stems plumb. No deviation shall be made from the required line or grade without approval of
20、 the purchaser. Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without license from IHS -,-,- 4AWWA C603-05 Sec. 4.4Excavation and P
21、reparation of Trench The trench shall be excavated to the required alignment and depth shown on the purchasers drawings or as subsequently required in writing by the purchaser, and only so far in advance of pipe laying as permitted by the purchaser. 4.4.1Excavation methods.When necessary to prevent
22、caving, trench excava- tions shall be sheeted and braced or sloped according to applicable laws and ordinances. When sheeting and bracing are used, the trench width shall not be less than that specified in Sec. 4.4.2. As backfill is placed and sheeting is withdrawn, the sheeting shall be withdrawn v
23、ertically in increments of not more than 1 ft (0.3 m), and the void left by the withdrawn sheeting shall be filled and compacted before the next increment is withdrawn. Excavated material shall be piled in a manner that will not endanger the work or obstruct sidewalks and driveways. Gutters shall be
24、 kept clear or other provisions made for surface drainage. 4.4.2Trench width.The trench width shall be ample to permit the pipe to be laid and jointed properly and the backfill to be placed and compacted as specified by the purchaser. Trenches shall be of such extra width, when required, to permit t
25、he convenient placing of timber supports and sheeting and bracing, as well as the handling of specials. 4.4.3Trench preparation.The trench shall be prepared for the direct placement of the pipe. This preparation includes digging coupling holes in the trench bottom or bedding. (Illustrations of the v
26、arious bedding conditions are presented in ANSI/AWWA C401 and ANSI/AWWA C403.) 4.4.4Excavation in poor soil and refilling to grade.Any part of the trench excavated below grade shall be backfilled to grade with thoroughly compacted material acceptable to the purchaser. When an unstable subgrade condi
27、tion is encountered and, in the opinion of the purchaser, it cannot support the pipe, an additional depth shall be excavated and refilled to pipe foundation grade with crushed stone or other suitable material as required by the purchaser to achieve a satisfactory trench bottom. 4.4.5Pipe laid on tre
28、nch bottom or bedding.Before the pipe is lowered into the trench, the constructor shall 1.Excavate a coupling hole having sufficient length, width, and depth to permit assembly and provide a minimum clearance of 2 in. (50 mm) below the coupling. 2.Provide the pipe with continuous support between cou
29、pling holes. Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without license from IHS -,-,- INSTALLATION OF ASBESTOSCEMENT PRESSURE P
30、IPE5 NOTE: Use of cohesionless, free-draining material for bedding is recommended as a preferred method of preparing the trench bottom for pipe installation. Sec. 4.5Laying of Pipe 4.5.1Lowering of pipe and accessories into trench.Pipe shall not be lowered into the trench until the pipe bedding mate
31、rial has been brought to grade. Pipe and accessories shall be inspected for defects. Dirt and other foreign matter shall be removed from the interior and the machined ends of the pipe before it is lowered into the trench. Pipe and accessories shall be lowered carefully into the trench by hand or wit
32、h suitable equipment in a manner that will prevent damage to pipe and fittings or injury to the installers. The sealing surfaces of all materials shall be kept clean during installation. 4.5.2Pipe joints.The machined ends of pipe to be jointed, coupling grooves, and rubber rings shall be cleaned imm
33、ediately before assembly, and assembly shall be made as recommended by the manufacturer. CAUTION: Do not reverse the gasket when placing it in the coupling. Each pipe joint shall be sealed with a coupling consisting of an asbestoscement sleeve and two rubber rings or an equivalent coupling or joint
34、of equivalent strength and performance. The pipe joint shall not be deflected either vertically or horizontally beyond the limits recommended by the manufacturer. 4.5.2.1When pipe laying is not in progress, the open ends of installed pipe shall be closed to prevent the entrance of water into the lin
35、e. 4.5.2.2Whenever water is in the pipe trench, enough backfill shall be placed on the pipe to prevent it from floating. Any pipe that has floated shall be removed from the trench and the bedding shall be corrected to conform to Sec. 4.4.3. No pipe shall be laid when the weather is unsuitable for pr
36、oper installation, as determined by the purchaser. 4.5.3Closure system.Closure lengths and closure couplings should be used for tying in asbestoscement pipe. Closure lengths and closure couplings can span closure distances up to 13 ft (3.96 m) without any field cutting. They eliminate any possible a
37、irborne asbestos fiber exposure, which may result from the field cutting of pipe. 4.5.4Pipe cutting.Since the introduction of the closure system, pipe cutting is no longer required in the field. If pipe cutting is performed, methods that produce a smooth square-cut end, without damage to the pipe, a
38、nd that do not produce airborne Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without license from IHS -,-,- 6AWWA C603-05 particle
39、s, shall be employed. Abrasive discs are prohibited unless they are equipped with local exhaust ventilation and a high-efficiency particulate air (HEPA) filter dust collection system. 4.5.5End preparation.Whenever it is necessary to cut a length of pipe in the field, the end shall be prepared as fol
40、lows: 4.5.5.1The pipe end of random lengths shall be machined by commercially available field lathes designed to ensure that the diameter, profile, and roundness meet the pipe manufacturers specifications. The machined surface on which the compression ring seals shall be smooth and cylindrical to en
41、sure joint integrity. 4.5.5.2The pipe end of machined overall lengths shall be beveled according to the pipe manufacturers specifications. 4.5.6Length of pipe at fittings and rigid structures.Where rigid joints are formed by caulked materials or by bolts with rubber-ring seals, such as at fittings,
42、the length of 8-in. (200-mm) diameter and smaller pipe fitted into the bell of the fittings shall not exceed 3 ft 3 in. (1 m); the length of 10-in. (250-mm) diameter and larger pipe shall not exceed 6 ft 6 in. (2 m). At least one flexible joint shall be used between two adjacent rigid joints. A coup
43、ling shall be cast in the wall of rigid structures at the point of entry of pipelines to provide flexibility at the wall. To provide additional flexibility, the pipe at the point of entry shall have a laying length of not more than 6 ft 6 in. (2 m). Sec. 4.6Jointing of Pipe to Valves, Hydrants, and
44、Fittings 4.6.1General.Each valve, hydrant, or fitting connected to asbestoscement pipe shall have a profile that permits a seal to be made between the machined pipe and the bell of the fitting with a continuous rubber-ring gasket. 4.6.1.1Before valves, hydrants, or fittings are laid, all lumps, blis
45、ters, and excess coating shall be removed from the bell. The inside of the bell shall then be wire-brushed, and both the inside of the bell and the spigot end of the pipe shall be wiped clean and dry. Surfaces to be jointed shall be kept clean until the joints are made. 4.6.2Push-on joint.The push-o
46、n joint is a single rubber-gasket joint. It shall be assembled by positioning a continuous rubber-ring gasket in the annular groove of the fitting bell and pulling the machined pipe end into the bell. A lubricant acceptable to the pipe manufacturer must be used. The correct size of gasket for the fi
47、tting bell shall be used with the correct size of asbestoscement pipe. Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:37:59 MDTNo reproduction or networking permitted without licens
48、e from IHS -,-,- INSTALLATION OF ASBESTOSCEMENT PRESSURE PIPE7 4.6.3Mechanical joint.The mechanical joint is a bolted joint of the stuffing-box type. In some sizes and classes, an adaptor is required between the asbestoscement pipe and the mechanical joint. The joints and assembly shall conform to t
49、he current revision of ANSI/AWWA C111/A21.11. Sec. 4.7Setting of Hydrants, Valves, and Fittings 4.7.1General.Hydrants, valves, and fittings shall be provided and installed as shown on the drawings or as specified by the purchaser. They shall be inspected carefully and cleaned as required in Sec. 4.6.1.1 before they are lower