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AWWA C105 A21 5-2010 Polyethylene Encasement for Ductile-Iron Pipe Systems.pdf

1、ANSI/AWWA C105/A21.5-10 (Revision of ANSI/AWWA C105/A21.5-05) AWWA Standard Effective date: Oct. 1, 2010. First edition approved by AWWA Board of Directors in 1972. This edition approved June 20, 2010. Approved by American National Standards Institute July 15, 2010. 6666 West Quincy Avenue Advocacy

2、Denver, CO 80235-3098 Communications T 800.926.7337 Conferences www.awwa.org Education and TrainingScience and TechnologySections The Authoritative Resource on Safe Water Polyethylene Encasement for Ductile-Iron Pipe Systems ii AWWA Standard This document is an American Water Works Association (AWWA

3、) standard. It is not a specification. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifi- cations. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until ea

4、ch 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 product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards is entirely voluntary. This standar

5、d 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 that the product described will provide satisfactory service. When AWWA revises or withdr

6、aws 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 following the month of Journal AWWA publication of the official notice. American National Standard An Ame

7、rican 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 the general public. The existence of an American National Standard does not in any respect precl

8、ude 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. Ameri- can National Standards are subject to periodic review, and users are cautioned to obtain the latest editions

9、. 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 are produced in conformity with particular American National Standards. Caution n oti Ce : The A

10、merican 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 any time. ANSI procedures require that action be taken to reaffirm, revise, or withdraw this

11、 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 Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036; (212) 642-4900, or e-mai

12、ling infoansi.org. 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, recording, or any information or retrieval system, except in the form of brief excerpts or quotations for review purposes,

13、without the written permission of the publisher. Copyright 2010 by American Water Works Association Printed in USAiii Committee Personnel Subcommittee 4, Coatings and Linings, which reviewed and developed this revision, had the fol- lowing personnel at the time: Richard W. Bonds, Chair General Inter

14、est Members D.R. Kroon, Corrpro Companies Inc., Houston, Texas (AWWA) P.I. McGrath Jr., Consultant, Birmingham, Ala. (AWWA) J.R. Plattsmier, HDR Engineering Inc., Denver, Colo. (AWWA) E.S. Ralph,* Standards Engineer Liaison, AWWA, Denver, Colo. (AWWA) D.W. Russom, Russom Technical Services LLC, Vilo

15、nia, Ark. (AWWA) C.R. Schwenker, Malcolm Pirnie Inc., Arlington, Va. (AWWA) P.A. Selig, Consultant, Birmingham, Ala. (AWWA) W.H. Smith, W.H. Smith provided new figures showing installation methods; and extended the length of connecting piping to be wrapped from 2 ft (0.6 m) to 3 ft (0.9 m). Addition

16、ally, a requirement for wrapping service lines of dissimilar metals for a distance of 3 ft (0.9 m) from the ductile-iron pipe was also incorporated. In the 1993 revision of the standard, Sec. 4.1, Materials, was expanded to include 4-mil high-density cross-laminated (HDCL) polyethylene, and Class B

17、(colors) mate- rial was added to allow the purchase of colored polyethylene. Additionally, Table 1 was modified to reflect reduced tube widths comparable with push-on joint pipe and fittings, * International Organization for Standardization (ISO), ISO Central Secretariat, 1 ch. de la Voie- Creuse, C

18、ase postale 56, CH-1211, Geneva 20, Switzerland. CIPRA became the Ductile Iron Pipe Research Association (DIPRA) in 1979.xi and the size range was expanded to include 60- and 64-in. (1,500- and 1,600-mm) pipe. A recommendation that circumferential wraps of tape be placed at 2-ft (0.6-m) intervals al

19、ong the barrel of the pipe for installation below the water table or in areas subject to tidal actions was added to Sec. 4.3.1, and Sec. 4.3.6 was revised to indicate the preferred method of making direct service taps on polyethylene-encased pipe. An illustration of this procedure was added. In 1999

20、, the format was changed to AWWA standard style; Sec. II.D, Copper Service Connections, was added to the foreword of the standard; and, definitions of parties and types of polyethylene film were added to Section 3, Definitions, of the standard. Additionally, changes to Sec. 4.1, Materials, included:

21、 (1) deletion of low- density polyethylene film; (2) the addition of linear low-density polyethylene film and appropriate material requirements and physical properties; (3) increasing the tensile strength requirements for the high-density cross-laminated polyethylene film; (4) the addition of impact

22、- and tear-resistance requirements for both polyethylene materials; (5) deletion of the minus tolerance on film thickness for both materials; and, (6) the addition of an ultraviolet inhibitor to any natural or colored film except black film con- taining 2 percent or more of carbon black. Other chang

23、es to the standard included the addition of Sec. 4.3, Marking, to facilitate traceability and to help ensure compliance with the standard; the addition of an alternate method of using a 3-ft (0.9-m) sheet of polyethylene rather than a 3-ft (0.9-m) length of polyethylene tube for joint makeup to Sec.

24、 4.4.2.2, Method; and, the addition of Sec. 5.1, Inspection and Certification by Manufacturer, to help ensure compliance with the standard. Also, in appendix A, a new paragraph on stray current corrosion and a new section on uniquely severe environ- ments were added. Additionally, the resistivity ra

25、nges in Table A.1, Soil-Test Evalua- tion, were increased to make the procedure more conservative. The next edition of ANSI/AWWA C105/A21.5 was approved by the AWWA Board of Directors on June 12, 2005. This edition of ANSI/AWWA C105/A21.5 was approved on June 20, 2010. II. Special Issues. II.A. Usef

26、ul Life of Polyethylene. Tests of polyethylene used to protect ductile- iron and gray-iron pipe have shown that after 40 years of exposure to severely corrosive soils, strength loss and elongation reduction are insignificant. US Bureau of Reclamation (BUREC) studies* of polyethylene film used underground illustrate * Laboratory and Field Investigations of Plastic Films. US Department of the Interior, Bureau of Reclamation, Rept. No. ChE-82 (September 1968).

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