AWWA C517-2016 Resilient-Seated Cast-Iron Eccentric Plug Valves.pdf

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1、AWWA Standard SM Resilient-Seated Cast-Iron Eccentric Plug Valves Effective date: Oct. 1, 2016. First edition approved by AWWA Board of Directors June 12, 2005. This edition approved Jan. 16, 2016. Approved by American National Standards Institute March 9, 2016. ANSI/AWWA C517-16 (Revision of ANSI/A

2、WWA C517-09)ii AWWA Standard This document is an American Water Works Association (AWWA) 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 specifications. The AWWA standards

3、 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 pub- lication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify

4、, 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 code of any governmental authority. AWWA standards are intended to represent a consensus of the water industry that the p

5、roduct described will provide satisfactory ser- vice. When AWWA revises or withdraws this standard, an official notice of action will be placed on the first page of the Official Notice section of Journal American Water Works Association. The action becomes effective on the first day of the month fol

6、lowing 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 National Standard is intended as a guide to aid th

7、e manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether that person has ap - proved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming

8、 to the standard. 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 encour - aged to state on their own responsibility in advertising and promotional material

9、s or on tags or labels that the goods are produced in conformity with particular American National Standards. Caution n oti Ce : The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American Nationa

10、l 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 publication. Purchasers of American National Standards may receive current information on all standards by calling

11、 or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036; 212.642.4900; or emailing infoansi.org. ISBN-13, print: 978-1-62576-183-5 eISBN-13, electronic: 978-1-61300-392-3DOI: http:/dx.doi.org/10.12999/AWWA.C517.16 All rights reserved. No part of t

12、his 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, without the written permission of the publisher. Cop

13、yright 2016 by American Water Works Association Printed in USA hours of work by your fellow water professionals. Revenue from the sales of this AWWA material supports ongoing product development. Unauthorized distribution, either electronic or photocopied, is illegal and hinders AWWAs mission to sup

14、port the water community. This AWWA content is the product of thousands ofiii Committee Personnel The AWWA Standards Committee on Eccentric Plug Valves, which reviewed and approved this standard, had the following personnel at the time of approval: Fred L. Hinker, Chair General Interest Members A. A

15、li, ADA Consulting Ltd, Surry, B.C., Canada (AWWA) B.E. Bosserman, Mission Viejo, Calif. (AWWA) F.L. Hinker, Santa Rosa, N.M. (AWWA) M.B. Horsley, Horsley Engineering LLC, Overland Park, Kan. (AWWA) T.J. McCandless,* Standards Engineer Liaison, AWWA, Denver, Colo. (AWWA) W.H. Peffley, Crawford, Murp

16、hy and NSF/ANSI 61, Drinking Water System ComponentsHealth Effects. * American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036. Persons outside the United States should contact the appropriate authority having jurisdiction. NSF International, 789 North Dixboro Roa

17、d, Ann Arbor, MI 48105.viii 3. Other references, including AWWA standards, Food Chemicals Codex, Water Chemicals Codex,* and other standards considered appropriate by the state or local agency. Various certification organizations may be involved in certifying products in accor- dance with NSF/ANSI 6

18、1. Individual states or local agencies have authority to accept or accredit certification organizations within their jurisdictions. Accreditation of certi- fication organizations may vary from jurisdiction to jurisdiction. Annex A, “Toxicology Review and Evaluation Procedures,” to NSF/ANSI 61 does n

19、ot stipulate a maximum allowable level (MAL) of a contaminant for substances not regulated by a USEPA final maximum contaminant level (MCL). The MALs of an unspecified list of “unregulated contaminants” are based on toxicity testing guidelines (noncarcinogens) and risk characterization methodology (

20、carcinogens). Use of Annex A procedures may not always be identical, depending on the certifier. ANSI/AWWA C517 does not address additives requirements. Users of this stan- dard should consult the appropriate state or local agency having jurisdiction in order to 1. Determine additives requirements,

21、including applicable standards. 2. Determine the status of certifications by parties offering to certify products for contact with, or treatment of, drinking water. 3. Determine current information on product certification. In an alternative approach to inadvertent drinking water additives, some jur

22、isdic- tions (including California, Maryland, Vermont, and Louisiana at the time of this writing) are calling for reduced lead limits for materials in contact with potable water. Various third-party certifiers have been assessing products against these lead content criteria, and a new ANSI-approved

23、national standard, NSF/ANSI 372, Drinking Water System ComponentsLead Content, was published in 2010. On Jan. 4, 2011, legisla- tion was signed revising the definition for “lead free” within the Safe Drinking Water Act (SDWA) as it pertains to “pipe, pipe fittings, plumbing fittings, and fixtures.”

24、The changes went into effect on Jan. 4, 2014. In brief, the new provisions to the Safe Drinking Water Act (SDWA) require that these products meet a weighted average lead content of not more than 0.25 percent. II. Special Issues. II.A. General. Conditions under which a valve is to be operated must be

25、 evaluated carefully by the purchaser. Torque requirements for valve operation vary * Both publications available from National Academy of Sciences, 500 Fifth Street, NW, Washington, DC 20001.ix considerably with differential pressure across the valve, uid velocity, uid temperature, and upstream pip

26、ing conditions. Flow and pressure direction are important in the installation and use of an eccen- tric plug valve. Valve performance and sealing characteristics vary with direction of pressure on the plug (closure member). II.B. Advisory Information on Product Application. This standard does not co

27、ver all possible applications or manufacturing technologies. The purchaser should identify special requirements and required deviations from this standard and include appropriate language in purchase documents (refer to Sec. III.A) in this foreword. Other advisory information is provided below. 1. T

28、he maximum anticipated ow velocity through the valve, maximum non- shock shutoff pressure, and water temperature range are used by manufacturers to cal- culate torque requirements, which then may determine valve operating-component de- sign and actuator sizing. This information should be provided un

29、der items 6, 7, and 9 of Sec. III.A in this foreword. Note : If this information is not provided by the purchaser, valve actuators may be sized to actuate the valve at a shutoff pressure differential equal to the design working pressure of the valve and a maximum ow velocity of 8 ft/sec (2.4 m/sec).

30、 This may result in an oversized valve actuator and a signicant unwarranted expense for the purchaser. 2. This standard limits handwheel rim pull but not handwheel diameter. A smaller handwheel may require a more expensive actuator requiring more turns. If a large-diameter handwheel is of concern, b

31、ecause of clearance or other limitations, the diameter should be limited to an acceptable dimension under item 12.a of Sec. III.A in this foreword. 3. This standard does not require a minimum waterway area nor does it limit head loss across the valve. If these are of concern, limitations should be p

32、rovided. 4. This standard allows a party other than the valve manufacturer to mount an actuator to a valve. The purchaser is cautioned that the valve manufacturer cannot assume responsibility for the valves sealing and operating performance if the actuator is mounted or adjusted by a party other tha

33、n the valve manufacturer. If this is a concern, requirements on actuator mounting should be included in the purchase documents. 5. Electric actuators meeting ANSI/AWWA C542, Electric Motor Actuators for Valves and Slide Gates, can be supplied with or without an intermediate quarter-turn mechanism. I

34、f desired, the purchaser should specify a multiturn actuator coupled to an intermediate mechanism meeting ANSI/AWWA C542.x 6. This standard does not require rubber parts to be specically tested or to be specically suitable for service with line content containing chlorine or chloramines. Standardize

35、d tests measuring resistance to chlorine- or chloramine-bearing waters were not available at the date of introduction of this standard. If these or other chemical constituents are of concern, special requirements may be included in the purchase documents. Refer to item 27 of Sec. III.A in the forewo

36、rd. 7. Valves produced in accordance with this standard are also commonly used for wastewater applications with high solids content. For water containing suspended solids or fluids other than water, the manufacturer should be consulted about the appli- cability of the valve and the materials of cons

37、truction. 8. Chlorine and chloramine degradation of elastomers: The selection of materi- als is critical for water service and distribution piping in locations where there is a pos- sibility that elastomers will be in contact with chlorine or chloramines. Documented research has shown that elastomer

38、s such as gaskets, seals, valve seats, and encapsu- lations may be degraded when exposed to chlorine or chloramines. The impact of degradation is a function of the type of elastomeric material, chemical concentration, contact surface area, elastomer cross section, and environmental conditions as wel

39、l as temperature. Careful selection of and specifications for elastomeric materials and the specifics of their application for each water system component should be considered to provide long-term usefulness and minimum degradation (swelling, loss of elasticity, or softening) of the elastomer specif

40、ied. III. 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. III.A. Purchaser Options and Alternatives. The following information should be provi

41、ded by the purchaser. 1. Standard usedthat is, ANSI/AWWA C517, Resilient-Seated Cast-Iron Eccentric Plug Valves, of latest revision. 2. Quantity required. 3. Description of connecting piping: material, pipe outside diameter, and flanged, grooved, or plain end. 4. Type of installation: buried or aboveground. 5. For low-pressure applications, 25 psig, the purchaser should request a low- pressure 5-psig seat test to ensure the valve will not leak. For pressures below 5 psig, the purchaser should contact the manufacturer.