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ANSI/AWWA C515-15 (Revi si on of AN SI /AW WA C51 5 - 0 9)

®

AWWA Standard

Reduced-Wall, ResilientSeated Gate Valves for Water Supply Service

Efecti ve date: Feb. 1 , 201 6. First edition approved by AWWA Board o f Directors Jan. 24, 1 999. This edition approved J une 7, 201 5. Approved by American N ational Standards Institute Oct. 30, 201 5.

SM

Copyright © 201 6 American Water Works Association. All Rights Reserved.

AWWA Standard This document is an American Water Works Association (AWWA) standard. It is not a speci f cation. AWWA standards describe minimum requirements and do not contain all o f the engineering and administrative in formation normally contained in speci f cations. The AWWA standards usually contain options that must be evaluated by the user o f the standard. Until each optional feature is speci f ed by the user, the product or service is not fully de f ned. AWWA pub lication o f a standard does not constitute endorsement o f any product or product type, nor does AWWA test, certi fy, or approve any product. The use o f AWWA standards is entirely voluntary. This standard does not supersede or take precedence over or displace any applicable law, regulation, or code o f any governmental authority. AWWA standards are intended to represent a consensus o f the water supply industry that the product described will provide satis factory service. When AWWA revises or withdraws this standard, an o f cial notice o f action will be placed on the f rst page o f the O f cial Notice section o f Journal – American Water Works Association . The action becomes efective on the f rst day o f the month following the month o f Journal – American Water Works Association publication o f the o f cial notice. -

American National Standard An American National Standard implies a consensus o f those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manu facturer, the consumer, and the general public. The existence o f an American National Standard does not in any respect preclude anyone, whether that person has ap proved the standard or not, from manu facturing, marketing, purchasing, or using products, processes, or procedures not con forming to the standard. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers o f goods made in con formity with an American National Standard are encour aged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods are produced in con formity with particular American National Standards.

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C au tion n otiCe : The American National Standards Institute (ANSI) approval date on the front cover o f this standard

indicates completion o f the ANSI approval process. This American National Standard may be revised or withdrawn at any time. ANSI procedures require that action be taken to rea f rm, revise, or withdraw this standard no later than f ve years from the date o f publication. Purchasers o f American National Standards may receive current in formation on all standards by calling or writing the American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, N Y 1 0036; 21 2.642.4900; or emailing in [email protected].

This AWWA content is the product of thousands of 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 AWWA’s mission to support the water community.

ISBN-1 3, print:

978-1 -62576-1 37-8

eISBN-1 3, electronic: 978-1 -61 300-363-3 DOI: http://dx.doi.org/1 0.1 2999/AWWA.C51 5.1 5

All rights reserved. No part o f this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any in formation or retrieval system, except in the form o f brie f excerpts or quotations for review purposes, without the written permission o f the publisher. Copyright © 201 5 by American Water Works Association Printed in USA

ii Copyright © 201 6 American Water Works Association. All Rights Reserved.

Committee Personnel

Te AWWA Standards C515 Subcommittee that reviewed this standard had the following personnel at the time of approval: Tomas J. Mettler, Chair M.H. Burns, One Bolt Inc., Denver, Colo. (AWWA) L.W. Fleury Jr., Mueller Group, Smithfeld, R.I. (AWWA) S. Flora, M&H Valve Company, Anniston, Ala. (AWWA) J.J. Gemin, AECOM, Kitchener, Ont., Canada (AWWA) T.C . Harbour, Clow Valve Company, Oskaloosa, Iowa (AWWA) T.R. Ingalls,* EJ USA Inc., East Jordan, Mich. (AWWA) R.L. Larkin, American Flow Control, Birmingham, Ala. (AWWA) R. Looney, American AVK Company, Minden, Nev. (AWWA) T.J. Mettler, Waterous Company, South St. Paul, Minn. (AWWA) K.J. Wright, EJ USA Inc., East Jordan, Mich. (AWWA) Te AWWA Standards Committee on Gate Valves and Swing Check Valves, which reviewed and approved this standard, had the following personnel at the time of approval: Joseph J. Gemin, Chair Robert Gardner, Vice-Chair General Interest Members

J.M. Assouline,* CH2M HILL, Englewood, Colo. M.D. Bennett, MWH, Cleveland, Ohio D. Diefenbach, Carollo, Phoenix, Ariz. J.J. Gemin, AECOM, Kitchener, Ont., Canada J. Hebenstreit, Underwriters Laboratories, Northbrook, Ill. M.C. Johnson, Utah State University Water Research Laboratory, Logan, Utah S.M. Passarelli,† Standards Engineer Liaison, AWWA, Denver, Colo. T.R. Volz, AECOM, Denver, Colo. M.P. Yoke, Anniston, Fla. * Alternate † Liaison, nonvoting iii

Copyright © 201 6 American Water Works Association. All Rights Reserved.

(AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA) (AWWA)

Producer Members J.V. Ballun, Val-Matic Valve & Manufacturing Corporation, Elmhurst, Ill.

f

J. Bolender, J and S Valves, Hu man,

Texas

(AWWA) (AWWA)

D.E. Burczynski,* Kennedy Valve, Elmira, N.Y.

(AWWA)

L.W. Fleury Jr., Mueller Group, Smith feld, R.I.

(AWWA)

T.C. T.R.

Harbour, Clow Valve Company, Oskaloosa, Iowa

(AWWA)

Ingalls,* East Jordan Iron Works Inc., East Jordan, Mich.

(AWWA)

R.L. Larkin,* J and S Valves, Gardendale, Ala.

(AWWA)

R. Looney, American AVK Company, Minden, Nev.

(AWWA)

T.J.

Mettler, Waterous Company, South St. Paul, Minn.

(AWWA)

D.B. Scott,* American Flow Control, Birmingham, Ala.

(AWWA)

J.H. Wilber,* American AVK, Littleton, Colo.

(AWWA)

K.J. Wright, EJ USA Inc., East Jordan, Mich.

(AWWA)

User Members R.L. Gardner,† Standards Council Liaison, Wannacomet Water Company, Nantucket, Mass.

(AWWA)

B. Hasanabadi, Colorado Springs Utilities, Colorado Springs, Colo. S. Hattan,

Tarrant Regional Water District,

Fort Worth,

K. S. Jeng-Bulloch, City of Houston, Houston,

Texas

Texas

(AWWA) (AWWA) (AWWA)

M. MacConnell, Metro Vancouver, Burnaby, B.C., Canada

(AWWA)

J. S. Olson, Front Range Standard Committee, Littleton, Colo.

(AWWA)

A. Quiniones, US Bureau of Reclamation, Denver, Colo.

(AWWA)

D. Rausch, City of Aurora Water Department, Aurora, Colo.

(AWWA)

P.J. Ries, Denver Water Department, Denver, Colo.

(AWWA)

* Alternate † Liaison, nonvoting iv

Copyright © 201 6 American Water Works Association. All Rights Reserved.

Contents All AWWA standards follow the general format indicated subsequently. Some variations from this format may be found in a particular standard. SEC.

PAGE

SEC.

PAGE

4.3 General Design ............................... 10 I Introduction .................................... vii 4.4 Detailed Design .............................. 11 I.A Background..................................... vii 4.5 Fabrication ...................................... 22 I.B History............................................ vii 5 Verifcation I.C Acceptance ...................................... vii 5.1 Testing ............................................ 22 II Special Issues. ................................... ix 5.2 Plant Inspection and Rejection ........ 24 II.A Chlorine and Chloramine Degradation of Elastomers ......... ix 6 Delivery III Use of Tis Standard ........................ ix 6.1 Marking .......................................... 25 6.2 Preparation for Shipment................. 25 III.A Purchaser Options and Alternatives ................................ ix 6.3 Afdavit of Compliance .................. 25 III.B Modifcation to Standard ................. xi IV Major Revisions................................ xi Appendix V Comments ....................................... xi A Installation, Operation, and Foreword

Maintenance of Reduced-

Standard

Wall, Resilient-Seated Gate Valves

........................................... 27 1.1 Scope ................................................ 1 A.A.21 General ....................................... 27 1.2 Purpose ............................................. 2 A.3 Unloading Inspection ....................... 27 1.3 Application........................................ 2 A.4 Receiving Storage ............................................ 28 2 References ........................................ 2 A.5 Installation ...................................... 28 3 Def nitions ....................................... 5 A.6 Maintenance ................................... 31 A.7 Repairs ............................................ 32 4 Requirements 4.1 Data to Be Supplied by the Manufacturer .............................. 6 Tables 1 Design Torque................................. 11 4.2 Materials ........................................... 7 2 Minimum Waterway Sizes .............. 12 1

General

v

Copyright © 201 6 American Water Works Association. All Rights Reserved.

SEC.

3 4 5 6 7

PAGE

SEC.

Minimum Tickness of Body and Bonnet ............................... 12 Minimum Tickness for Ductile-Iron Connecting End Flanges ........... 13 Excess Flange Tickness ................. 14 Stem, Gate, Trust Collar, and Stem Nut Copper Alloys .................... 16 Stainless-Steel Valve Stem Alloys ..... 17

PAGE

8 Minimum Diameter of Stem and Minimum Number of Turns To Open.................................... 18 9 Outside Diameter of Handwheels .............................. 20 10 Gear Ratios ..................................... 21 11 Proof-of-Design Torque ................... 23

vi

Copyright © 201 6 American Water Works Association. All Rights Reserved.

Foreword Tis foreword is for information only and is not a part ofANSI*/AWWA C515. I.

Introduction.

I.A. Background. Tis standard describes reduced-wall, resilient-seated gate valves with nonrising stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping gate valves, for water supply service. Te standard applies to water supply service having a pH range of 6.5 to 8.5 and a temperature from 33° to 125°F (0.6° to 52°C). I.B. History. Te frst edition of ANSI/AWWA C509, Resilient-Seated Gate Valves, was published in 1980. ANSI/AWWA C509 includes body and bonnet parts of either gray or ductile cast iron with shell-wall thicknesses equal to those of the ANSI/ AWWA C500, Metal-Seated Gate Valves, which was frst issued in 1952 as ANSI/ AWWA C500 but had its roots going back to the frst AWWA standard for gate valves adopted June 24, 1913. In 1993, the AWWA Standards Committee on Gate Valves and Swing Check Valves received authorization from the AWWA Standards Council to prepare a standard covering reduced-wall, resilient-seated gate valves. Just as other recent AWWA standards have been developed as a result of the attendant strength of ductile iron (for pressure pipe and compact fttings), this standard results from its application for gate valves. Te Manufacturers Standardization Society of the Valves and Fittings Industry (MSS) has played an important role in developing this standard. Founded in 1924, MSS has had ofcial organizational representation on AWWA standards committees dealing with valve and hydrant products since 1930. ANSI/AWWA C515-09 was approved by the AWWA Board of Directors on Jan. 25, 2009. Tis edition was approved on June 7, 2015. I.C. Acceptance. In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF)† to develop voluntary third-party consensus standards and a certifcation program for direct and indirect drinking water additives. Other members of the original consortium included the Water Research Foundation‡ (formerly AwwaRF) * American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036. † NSF International, 789 North Dixboro Road, Ann Arbor, MI 48105. ‡ Water Research Foundation, 6666 West Quincy Avenue, Denver, CO 80235. vi i

Copyright © 201 6 American Water Works Association. All Rights Reserved.

and the Conference of State Health and Environmental Managers (COSHEM). Te American Water Works Association (AWWA) and the Association of State Drinking Water Administrators (ASDWA) joined later. In the United States, authority to regulate products for use in, or in contact with, drinking water rests with individual states.* Local agencies may choose to impose requirements more stringent than those required by the state. To evaluate the health efects of products and drinking water additives from such products, state and local agencies may use various references, including 1. An advisory program formerly administered by USEPA, Ofce of Drinking Water, discontinued on Apr. 7, 1990. 2. Specifc policies of the state or local agency. 3. Two standards developed under the direction of NSF: NSF/ANSI 60, Drinking Water Treatment Chemicals—Health Efects, and NSF/ANSI 61, Drinking Water System Components—Health Efects. 4. Other references, including AWWA standards, Food Chemicals Codex, Water Chemicals Codex,† and other standards considered appropriate by the state or local agency. Various certifcation organizations may be involved in certifying products in accordance with NSF/ANSI 61. Individual states or local agencies have authority to accept or accredit certifcation organizations within their jurisdictions. Accreditation of certifcation organizations may vary from jurisdiction to jurisdiction. Annex A, “Toxicology Review and Evaluation Procedures,” to NSF/ANSI 61 does not stipulate a maximum allowable level (MAL) of a contaminant for substances not regulated by a USEPA fnal maximum contaminant level (MCL). Te MALs of an unspecifed list of “unregulated contaminants” are based on toxicity testing guidelines (noncarcinogens) and risk characterization methodology (carcinogens). Use of Annex A procedures may not always be identical, depending on the certifer. ANSI/AWWA C515 does not address additives requirements. Users of this standard should consult the appropriate state or local agency having jurisdiction in order to 1. Determine additives requirements, including applicable standards. 2. Determine the status of certifcations by parties ofering to certify products for contact with, or treatment of, drinking water. 3. Determine current information on product certifcation. * Persons outside the United States should contact the appropriate authority having jurisdiction. † Both publications are available from National Academy of Sciences, 500 Fifth Street, NW, Washington, DC 20001. vi i i

Copyright © 201 6 American Water Works Association. All Rights Reserved.

In an alternative approach to inadvertent drinking water additives, some jurisdictions (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 certifers have been assessing products against these lead content criteria, and a new ANSI-approved national standard, NSF/ANSI 372, Drinking Water System Components—Lead Content, was published in 2010. On Jan. 4, 2011, legislation was signed revising the defnition for “lead free” within the Safe Drinking Water Act (SDWA) as it pertains to “pipe, pipe fttings, plumbing fttings, and fxtures.” Te changes went into efect on Jan. 4, 2014. In brief, the new provisions to the SDWA require that these products meet a weighted average lead content of not more than 0.25 percent. II.A. Chlorine and Chloramine Degradation of Elastomers. Te selection of materials is critical for water service and distribution piping in locations where there is a possibility that elastomers will be in contact with chlorine or chloramines. Documented research has shown that elastomers such as gaskets, seals, valve seats, and encapsulations may be degraded when exposed to chlorine or chloramines. Te impact of degradation is a function of the type of elastomeric material, chemical concentration, contact surface area, elastomer cross section, and environmental conditions as well as temperature. Careful selection of and specifcations for elastomeric materials and the specifcs 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 specifed. 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. Te following information should be provided by the purchaser: 1. Standard used—that is, ANSI/AWWA C515, Reduced-Wall, ResilientSeated Gate Valves for Water Supply Service, of latest revision. 2. Whether compliance with NSF/ANSI 372, Drinking Water System Components—Lead Content, or an alternative lead content criterion is required. 3. Whether or not the purchaser requires that the cast ferrous valve components, in addition to the body and bonnet, be made of ductile iron. 4. Quantity required. 5. Special packaging for shipment as may be required for protection of coatings. 6. Whether the pH level of the water is less than 6.5 or greater than 8.5. II.

Special Issues.

III.

Use of Tis Standard.

ix

Copyright © 201 6 American Water Works Association. All Rights Reserved.

7. Size and type of valve, NRS or OS&Y (Sec. 1.1). 8. Whether or not the valve will be used in a corrosive environment (Sec. 1.1 .4) determined by methods described in AWWA Manual M27. 9. Catalog data, net weight, and assembly drawings to be provided by the manufacturer (Sec. 4.1), if required. 10. Details of other federal, state, or provincial and local requirements (Sec. 4.2.1). 11. If test records of valve componet materials are required (Sec. 4.2.4.2). 12. Whether or not the valve will be subjected to water that reacts chemically with materials used in these valves. Consultation with the manufacturer is advised to determine the suitability in cases of doubt (Sec. 4.2.4.5.5). 13. Other coating requirements (Sec. 4.2.4.11) and whether coating (Sec. 4.5.2) shall be NSF/ANSI 61 approved. 14. Cutter diameter must be specifed for tapping valves (Sec. 4.3.3). Note: Tapping machine shell-cutters are made in either full size (outside diameter [OD] is full nominal size) or undersize (OD is less than full nominal size, i.e., usually ½ in. (13 mm) less [MSS SP-113]). Te purchaser should specify the size of the shellcutter that the valve must accept. 15. Whether 54-in. (1,350-mm) valves shall have a reduced or full-size waterway (Sec. 4.3.3.2). 16. Type of valve ends—fanged, including dimensions (Sec. 4.4.1 .4.1-2), spot facing (Sec. 4.4.1 .4.1 -3), straddled bolt holes (Sec. 4.4.1 .4.1 -5), mechanical joint (Sec.  4.4.1 .4.2), push-on joint (Sec. 4.4.1 .4.3), tapping valve fange (Sec. 4.4.1 .4.4), and end fange requirements for large tapping valves (Sec. 4.4.1 .4.4-3). 17. Whether or not bolting material with physical and chemical properties other than ASTM A307 is required (Sec. 4.4.4). It is recommended that the purchaser verify with the supplier the appropriateness of any alternative bolting materials required. What alternative, if any, is desired in the type of rustproofng for bolts and nuts (Sec. 4.4.4.1). 18. Type of stem seal for NRS valves (Sec. 4.4.6.1) and for OS&Y valves (Sec. 4.4.6.2). 19. Packing material requirements (Sec. 4.4.6.2.1). 20. Whether the valve is handwheel or wrench-nut operated and the direction in which the handwheel or wrench nut shall turn to open (Sec. 4.4.7). 21. Detailed description of wrench nut, if not in accordance with Sec. 4.4.7.1 . 22. Whether gearing is required (Sec. 4.4.8). 23. Gear material requirements (Sec. 4.4.8.1). 24. If gear casing is required (Sec. 4.4.8.2). x

Copyright © 201 6 American Water Works Association. All Rights Reserved.

25.

If position indicators are required (Sec. 4.4.8.3).

26.

Whether or not records of tests speci fed in Section 5 are to be provided.

27.

Special markings (Sec. 6.1.1.1.1), if required.

28.

A

fdavit of compliance (Sec. 6.3), if required.

Modifcation to Standard.

III.B.

Any modi fcation of the provisions, de f nitions,

or terminology in this standard must be provided by the purchaser.

IV.

Major Revisions.

Major revisions made to the standard in this edition

include the following: 1.

Changed “if required by the purchaser” to “when required in the purchase

document.” User needs to call out options in its purchase documents. 2.

Format was updated to comply with the Style Guide for AWWA standards

and harmonized with AWWA C509. 3.

Updated Applicability to address considerations regarding valve suitability

for wastewater applications. 4.

Scope of standard was expanded to include 54-in. (1,350-mm) diameter

valves. 5.

Updated de f nition for Nominal Pipe Size and added de f nition for Nominal

Valve Size. 6.

Added new def nitions for Full Waterway and Reduced Waterway and added

new table for Minimum Waterway Sizes. 7.

Added minimum yield strength and minimum elongation requirements for

ductile iron. 8.

Updated requirements for Coatings to include minimum average thickness.

9.

Added requirements for Permeation.

V.

Comments.

If you have any comments or questions about this standard,

please call AWWA Engineering and

Technical

Services at 303.794.7711; FAX at

303.795.7603; write to the department at 6666 West Quincy Avenue, Denver, CO 80235 -3098; or email at [email protected].

xi

Copyright © 201 6 American Water Works Association. All Rights Reserved.

Tis page intentionally blank.

Copyright © 201 6 American Water Works Association. All Rights Reserved.

ANSI/AWWA C515-15 (Revi si on of AN SI /AW WA C51 5 - 0 9)

AWWA Standard

®

Reduced-Wall, Resilient-Seated Gate Valves for Water Supply Service SEC TI ON 1 :

Sec. 1.1

G EN ER AL

Scope

Tis standard describes reduced-wall, resilient-seated gate valves with nonrising stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping gate valves, for water supply service having a temperature range of 33° to 125°F (0.6° to 52°C). 1.1 .1 Velocity. Tese valves are intended for applications where fuid velocity does not exceed 16 ft/sec (4.9 m/sec) when the valve is in the full-open position. 1.1 .2 Sizes. Tis standard describes nonrising-stem resilient-seated gate valves 3-in. (75-mm) through 54-in. (1,350-mm) nominal pipe size (NPS) and outside screw-and-yoke (OS&Y) rising stem valves, 3-in. (75-mm) NPS through 16-in. (400-mm) NPS. 1.1 .3 Valve pressure rating. Te minimum design working water pressure shall be 200 psig (1,380 kPa) for all sizes. 1.1 .4 Conditions and materials not covered. Tis standard is not intended to describe special conditions of gate valve installation or operation, such as builtin power drive, installation in unusually corrosive soil, conveyance of unusually corrosive water, excessive water hammer, frequent operation (as in flter service), or 1

Copyright © 201 6 American Water Works Association. All Rights Reserved.

2 

AWWA C51 5 -1 5

operation in a throttled position. Tese conditions are beyond the intended scope of this standard and require special consideration in design and construction. 1.1 .5 Joint accessories. Joint accessories for end connections, such as bolts, gaskets, glands, and follower rings, are not described in this standard. Sec. 1.2

Purpose

Sec. 1.3

Application

Te purpose of this standard is to provide the minimum requirements for reduced-wall, resilient-seated gate valves for water supply service, including application, materials, design, testing, inspection, rejection, marking, and shipping.

Tis standard can be referenced in specifcations for purchasing and receiving reduced-wall, resilient-seated gate valves for water supply service. 1.3.1 Stipulations. Te stipulations of this standard apply when this document has been referenced and then only to reduced-wall, resilient-seated gate valves for water supply service. 1.3.2 Compatibility. Te valves encompassed by this standard require considerations for compatibility with the material being conveyed from both chemical and physical perspectives. Wastewater implies a lack of control over its chemical and physical composition. Valves in compliance with this standard may be suitable for wastewater applications; however, compliance does not ensure manufacturer approval of a specifc valve in wastewater applications. Suitability for a specifc valve should be determined by analyzing a particular wastewater application in conjunction with the manufacturer. SECTION 2:

REFERENCES

Tis standard references the following documents. In their latest editions, they form a part of this standard to the extent specifed within the standard. In any case of confict, the requirements of this standard shall prevail. ANSI*/AWWA C110/A21.10—Ductile-Iron and Gray-Iron Fittings. ANSI/AWWA C111/A21.11—Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings. ANSI/AWWA C153/A21.53—Ductile-Iron Compact Fittings for Water Service. * American National Standards Institute, 25 West 43rd Street, Fourth Floor, New York, NY 10036. Copyright © 201 6 American Water Works Association. All Rights Reserved.

REDUCED -WALL, RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE 

3

ANSI/AWWA C207—Steel Pipe Flanges for Waterworks Service, Sizes 4 In. Trough 144 In. (100 mm Trough 3,600 mm). ANSI/AWWA C550—Protective Interior Coatings for Valves and Hydrants. ANSI/AWWA C600—Installation of Ductile-Iron Mains and Teir Appurtenances. ANSI/SAE* AS 568A—Aerospace Size Standard for O-Rings. ASME† B16.1 —Gray Iron Pipe Flanges and Flanged Fittings: Classes 25, 125, and 250. ASME B16.10—Face-to-Face and End-to-End Dimensions of Valves. ASME B18.2.1 —Square, Hex, and Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series). ASME B18.2.3.1 M—Metric Hex Cap Screws. ASME B18.3—Socket Cap, Shoulder, Set Screws, and Hex Keys (Inch Series). ASME B18.3.1 M—Socket Head Cap Screws (Metric Series). AS TM‡ A27/A27M-13—Standard Specifcation for Steel Castings, Carbon, for General Application. ASTM A126-04—Standard Specifcation for Gray Iron Castings for Valves, Flanges, and Pipe Fittings. ASTM A153/A153M-09—Standard Specifcation for Zinc Coating (HotDip) on Iron and Steel Hardware. ASTM A276/A276M-15—Standard Specifcation for Stainless Steel Bars and Shapes. ASTM A307-14—Standard Specifcation for Carbon Steel Bolts, Studs, and Treaded Rod 60,000 PSI Tensile Strength. ASTM A380/A380M-13—Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems. ASTM A395/A395M-99—Standard Specifcation for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures. ASTM A473-15—Standard Specifcation for Stainless Steel Forgings. ASTM A536-84—Standard Specifcation for Ductile Iron Castings. ASTM A582/A582M-12e1—Standard Specifcation for Free Machining Stainless Steel Bars. * SAE International, 400 Commonwealth Drive, Warrendale, PA 15096. † ASME International, 3 Park Avenue, New York, NY 10016. ‡ AS TM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428. Copyright © 201 6 American Water Works Association. All Rights Reserved.

4 

AWWA C51 5 -1 5

AS TM A743/A743M-13ae1 —Standard Speci fcation for Castings, IronChromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application. AS TM B16/B16M-10 —Standard Speci fcation for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines. AS TM B62-15 —Standard Speci fcation for Composition Bronze or Ounce Metal Castings. AS TM B98/B98M-1 3 —Standard Speci fcation for Copper-Silicon Alloy Rod, Bar, and Shapes. AS TM B1 24/B1 24M-15 —Standard Speci fcation for Copper and Copper Alloy Forging Rod, Bar, and Shapes. AS TM B1 38/B1 38M-11 —Standard Speci fcation for Manganese Bronze Rod, Bar, and Shapes. AS T M B148 -14 —Standard Speci f cation for Aluminum-Bronze Sand Castings. AS TM B154-1 2e1 —Standard

Test

Method of Mercurous Nitrate

Test

for

Copper Alloys. AS TM B283/B283 -14a—Standard Speci fcation for Copper and CopperAlloy Die Forgings (Hot-Pressed). AS TM B584-14 —Standard Speci fcation for Copper Alloy Sand Castings for General Applications. AS TM B633-1 3 —Standard Speci fcation for Electrodeposited Coatings of Zinc on Iron and Steel. AS TM B763/B763M-15 —Standard Speci fcation for Copper Alloy Sand Castings for Valve Applications. AS TM B824-14—Standard Speci fcation for General Requirements for Copper Alloy Castings. AS TM D395 -14—Standard

Test Methods for Rubber Property—Compres-

sion Set. AS TM D429-14—Standard

Test Methods

for Rubber Property—Adhesion

to Rigid Substrates. AS TM D471-15 —Standard

Test

f

Method for Rubber Property—E ect of

Liquids. AS TM D1149-07—Standard

Test

Methods for Rubber Deterioration—

Cracking in an Ozone Controlled Environment. AS TM D2000-1 2—Standard Classi fcation System for Rubber Products in Automotive Applications.

Copyright © 201 6 American Water Works Association. All Rights Reserved.

REDUCED -WALL, RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE 

5

ASTM D5363-03—Standard Specifcation for Anaerobic Single-Component Adhesives (AN). ASTM D56/SAE HS-1806. 2012. Standard Test Method for Metals and Alloys in the Unifed Numbering System. AWWA Manual M27—External Corrosion for Infrastructure Sustainability. Fed. Spec.* HH-P-106d—Packing; Flax or Hemp. ISO 6509†—Corrosion of Metals and Alloys—Determination of Dezincifcation Resistance of Brass. MSS‡ SP-9—Spot Facing for Bronze, Iron, and Steel Flanges. MSS SP-60—Connecting Flange Joints Between Tapping Sleeves and Tapping Valves. MSS SP-113—Connecting Joints Between Tapping Machines and Tapping Valves. NSF/ANSI§ 61—Drinking Water System Components—Health Efects. NSF/ANSI 372—Drinking Water System Components—Lead Content. SECTION 3:

DEFINITIONS

Te following defnitions shall apply in this standard: 1. Antiseize compound: A compound that aids in nondestructive assembly and disassembly of threaded components. 2. Cosmetic defect: Blemishes that have no efect on the ability of the component to meet the structural design and production test requirements of this standard. Should the activities of plugging, welding, grinding, or repairing of the blemish cause the component to fail these requirements, the blemish may not be considered a cosmetic defect. 3. Flanged joint: Te fanged and bolted joint as described in ANSI/ AWWA C110/A21.1 0 or ASME B16.1 Class 125 or Sec. 4.4.1 .4.1 of this standard. * Federal specifcations are available from Naval Publications and Form Center, 5801 Tabor Avenue, Philadelphia, PA 19120. † ISO Standards are available from International Organization for Standardization, ISO Central Secretariat 1, ch. de la Voie-Creuse CP 56-CH-1211, Geneva 20, Switzerland. ‡ Manufacturers Standardization Society of the Valve and Fittings Industry, 127 Park Street, NE, Vienna, VA 22180. § NSF International, P.O. Box 130140, 789 North Dixboro Road, Ann Arbor, MI 48105. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

4. Full waterway: Te waterway through the entire length of the valve in the full-open position that provides an unobstructed cylindrical fow path. Te diameter of the fow path is equal to or larger than the nominal valve size. 5. Manufacturer: Te party that manufactures, fabricates, or produces materials or products. 6. Mechanical joint: Te gasketed and bolted joint as described in ANSI/ AWWA C110/A21.10, ANSI/AWWA C111/A21.11, or ANSI/AWWA C153/A21.53. 7. Nominal pipe size (NPS): A size identifcation number, not necessarily the actual dimension, that approximates the diameter of pipe. 8. Nominal valve size: Te size of valve expressed in inches or millimeters as the integer value of the nominal pipe size (NPS) designation with which the end connection of the valve is intended to be used. 9. Reduced waterway: Te waterway through the valve in the full-open position that provides a cross-sectional area of fow at any location that is less than the area of a circle having a diameter equal to the nominal valve size. 10. Purchaser: Te person, company, or organization that purchases any materials or work to be performed. 11. Push-on joint: Te single rubber-gasket joint as described in ANSI/ AWWA C111/A21.11. 12. Structural defect: Flaws that cause the component to fail the structural design or test requirements of this standard. Tese include but are not limited to imperfections that result in leakage through the walls of a casting, failure to meet minimum wall thickness requirement, or failure to meet production tests. 13. Supplier: Te party that supplies materials or services. A supplier may or may not be the manufacturer. 14. Tapping valve: A special gate valve designed with end connections and an unobstructed waterway to provide proper alignment and positioning of a tapping sleeve, valve, and machine for tapping a pipe dry or under pressure. SECTION 4: Sec. 4.1

REQUIREMENTS

Data to Be Supplied by the Manufacturer

When required in the purchase documents, the manufacturer shall provide the following information when supplying reduced-wall, ductile iron–body, resilientseated gate valves: Copyright © 201 6 American Water Works Association. All Rights Reserved.

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4.1 .1 Catalog data. Te manufacturer shall supply catalog data, including illustrations and a parts list that identify the materials used for various parts. 4.1 .1 .1 Catalog detail. Te information shall be in sufcient detail to serve as a guide in the assembly and disassembly of the valve and for ordering repair parts. 4.1 .2 Weight information. Manufacturer shall provide a statement of the net assembled weight for each size of valve exclusive of joint accessories. 4.1 .3 Assembly drawings. Manufacturer shall submit to the purchaser one set of drawings showing the principal dimensions, construction details, and materials used for valve parts. 4.1 .3.1 Drawing review. Work shall be done and valves shall be provided in accordance with these drawings after the drawings have been reviewed and accepted by the purchaser. Sec. 4.2

Materials

Materials used in valves produced according to this standard shall conform to the requirements stipulated in the following sections. 4.2.1 General. Materials shall comply with the requirements of the Safe Drinking Water Act and other federal regulations for potable water and reclaimed water systems, as applicable. 4.2.2 Permeation. Te selection of materials is critical for potable water, wastewater, and reclaimed water service and distribution piping in locations where there is likelihood that the pipe will be exposed to signifcant concentrations of pollutants composed of low-molecular-weight petroleum products or organic solvents or their vapors. Research has documented that pipe materials such as polyethylene, polybutylene, polyvinyl chloride, and asbestos cement and elastomers, such as those used in jointing gaskets and packing glands, are subject to permeation by lowermolecular-weight organic solvents or petroleum products. If a potable water, wastewater, or reclaimed 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, and so forth before selecting materials for use in that area. 4.2.3 Dissimilar metals. In the presence of an electrolyte, direct contact between metals of dissimilar corrosion resistance may result in galvanic corrosion of the more active, less corrosion-resistant material. 4.2.3.1 Selection of materials. When dissimilar metals must be used for internal parts, the rate of corrosion shall be reduced as much as practical through

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

the selection of materials that exhibit similar resistance to corrosion, by placing a dielectric material between metals, or by applying a dielectric coating. 4.2.3.2 Water quality or premature failure. When contact between dissimilar metals cannot be avoided, the assembly shall be designed so that the resulting corrosion will be minimized and will not adversely afect water quality or result in malfunctioning or premature failure of the assembly. 4.2.4 Physical and chemical properties. Te requirements of AWWA, ANSI, AS TM, or other standards referenced in this text shall govern the physical and chemical characteristics of the valve components. 4.2.4.1 Testing. Whenever valve components are to be made in conformance with AWWA, ANSI, AS TM, or other standards that include test requirements or testing procedures, the manufacturer or supplier shall comply with those procedures. 4.2.4.2 Test records. Records of tests performed shall, if required by the purchase documents, be made available to the purchaser. 4.2.4.3 Gray iron. Gray iron shall conform to or exceed the requirements of AS TM A126, Class B. 4.2.4.4 Ductile iron. Ductile iron shall conform to the requirements of AS TM A395 or AS TM A536. In addition, ductile iron shall have a minimum yield strength of 45,000 psi and minimum elongation of 5 percent. 4.2.4.5 Copper alloys. Copper alloys used in valves shall comply with the following: 4.2.4.5.1 Copper alloy valve components shall be made to AS TM-recognized alloy specifcations with unifed numbering system (UNS)* for metals and alloys designations. 4.2.4.5.2 Copper alloys are not limited to those specifed in this standard. 4.2.4.5.3 Copper alloys must meet the performance requirements of this standard including minimum yield strength, chemical requirements, and corrosion resistance. 4.2.4.5.4 Any copper alloy used in the cold-worked condition shall be capable of passing the mercurous nitrate test in accordance with AS TM B154 to minimize susceptibility to stress corrosion. 4.2.4.5.5 Waters in some areas have been shown to promote corrosion in the form of dezincifcation or dealuminization of copper alloys. Te manufacturer * Joint publication of AS TM and SAE (AS TM DS56E/SAE HS-1086, 2012). Copyright © 201 6 American Water Works Association. All Rights Reserved.

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9

should be notifed if this condition exists. Copper alloys that contain more than 16 percent zinc shall not be used in these waters unless specimens of the alloy tested in accordance with ISO 6509 exhibit dezincifcation depth of less than 25 µm. If aluminum bronze is used, the alloys shall be inhibited against dealuminization. 4.2.4.5.6 Copper alloys that contain more than 16 percent zinc shall not contain less than 57 percent copper. 4.2.4.5.7 Copper alloys that contain 16 percent or less zinc shall not contain less than 79 percent copper. 4.2.4.5.8 Valve components manufactured from some grades of manganese, bronze, or some other materials are subject to stress corrosion. Te manufacturer shall design the valve and select materials to minimize stress corrosion. 4.2.4.5.9 Copper alloys that contact drinking water shall comply with the Safe Drinking Water Act. 4.2.4.6 Carbon steel. Carbon steel castings, when used, shall conform to the requirements of AS TM A27 Grade U-60-30 or equivalent. 4.2.4.7 Stainless steel. Stainless steel used in valves shall comply with the following: 4.2.4.7.1 Te chemical composition of stainless-steel valve components shall contain not less than 15 percent chromium or more than 0.25 percent carbon, and shall be processed to reduce the formation of chromium carbides. 4.2.4.7.2 Stainless-steel valve components shall be made to AS TM recognized alloy specifcations with metal and alloys in the unifed numbering system (UNS). 4.2.4.7.3 Stainless-steel alloys are not limited to those specifed herein. 4.2.4.7.4 Stainless-steel alloys must meet the performance requirements of this standard including the minimum yield strength and chemical requirements. 4.2.4.7.5 After fnal forming and machining, exogenous iron shall be removed from fnished stainless-steel components that come in contact with water or those components shall be passivated in accordance with AS TM A380. 4.2.4.7.6 Other stainless-steel components shall be cleaned and descaled in accordance with the manufacturer’s requirements. 4.2.4.8 Gaskets. Gasket material shall be made of inorganic mineral fber, natural or synthetic rubber composition, or paper that is free from corrosive ingredients. 4.2.4.9 O-rings. O-rings or other suitable elastomeric seals may be used. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

Sec. 4.3

4.2.4.9.1 O-rings shall meet the requirements of AS TM D2000 and have physical properties suitable for the application. 4.2.4.10 Watertightness. Gaskets, O-rings, or other suitable elastomeric seals shall be used on fanged joints intended to be watertight. 4.2.4.11 Coatings. Unless otherwise specifed by the purchaser, valve coatings, as required in Sec. 4.5.2, shall be water-based enamel coating, black asphalt coating, or epoxy coating except as required by Sec. 4.4.1 .3. 4.2.4.1 2 Elastomers. Elastomers shall comply with the following: 1. Rubber seats shall be resistant to microbiological attack, copper poisoning, and ozone attack. 2. Rubber-seat compounds shall contain no more than 8 ppm of copper ion and shall include copper inhibitors to prevent copper degradation of the rubber material. 3. Rubber-seat compounds shall be capable of withstanding an ozone resistance test when tested in accordance with AS TM D1149. Te tests shall be conducted on unstressed samples for 70 hours at 104°F (40°C) with an ozone concentration of 500 ppb without visible cracking in the surfaces of the test samples after a test. 4. Rubber-seat compounds shall have a maximum compression set value of 20 percent when tested in accordance with AS TM D395 Method B for 22 hours at 158°F (70°C). 5. Rubber-seat compounds shall contain no more than 1.5 parts of wax per 100 parts of rubber hydrocarbon, and shall have less than 2 percent volume increase when tested in accordance with AS TM D471 after being immersed in distilled water at 73.4°F ±2°F (23°C ±1°C) for 70 hours. Reclaimed rubber shall not be used. 6. Rubber-seat compounds shall be free of vegetable oils, vegetable oil derivatives, animal fats, and animal oils.

General Design

4.3.1 Structural design. Valve parts shall be designed to withstand, without being structurally or otherwise damaged, (1) an internal test pressure of twice the rated design working pressure of the valve; and (2) the full-rated internal working pressure when the closure member is cycled once from a fully open to a fully closed position against the full-rated unbalanced working water pressure. 4.3.2 Stem torque. Te valve assembly and mechanism shall be capable of withstanding a design valve stem input torque as shown in Table 1. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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Table 1

Design torque

Nominal Valve Size

in.

3–4 6–16 Larger than 16

* (75–100) (150–400) (400) (mm)

* Nominal valve size mm is soft conversion (nominal in. size × 25). † Torque Nm is rounded to nearest 5 Nm (ft-lb × 1.356).

Design Torque ft-lb

200 300

(Nm)

11

†

(270) (405) Consult Manufacturer

4.3.3 Size ofwaterway. 4.3.3.1 Valves 48 in. (1,200 mm) and smaller shall have a full waterway the minimum diameter of which is in accordance with Table 2. 4.3.3.2 Valves of 54-in. (1,400-mm) size shall have either a full waterway the minimum diameter of which is in accordance with Table 2 or a reduced waterway the minimum diameter of which is in accordance with Table 2. 4.3.3.3 Pigging and tapping. 4.3.3.3.1 For pipelines that are to be cleaned by pigging and for tapping valves, the size of the waterway shall include appropriate clearance for the diameter of the pig or the diameter of the tapping machine cutter that is recommended by the valve manufacturer. 4.3.3.3.2 Since some tapping valves may require an undersized cutter, which is smaller than the nominal diameter of the valve, the valve manufacturer shall publish the maximum size cutter for each valve size. Sec. 4.4

Detailed Design

4.4.1 Body and bonnet. 4.4.1 .1 Material. Te body and bonnet shall be made of ductile iron. 4.4.1 .2 Shell thickness. Shell thickness at no point shall be less than the minimum metal thickness shown in Table 3. 4.4.1.3 Body seating surfaces. Resilient seats shall seal against a corrosionresistant surface. 4.4.1 .3.1 Te surface may be either metallic or nonmetallic, applied in a manner to withstand the action of the line fuids and the operation of the sealing gate during long-term service. 4.4.1 .3.2 A metallic surface shall have a corrosion resistance equivalent to or better than that of bronze.

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

Table 2

Minimum waterway sizes

Minimum Minimum Reduced Nominal Full Waterway Waterway Valve Size Diameter Diameter 3 3.00 — 4 4.00 — 6 6.00 — 8 8.00 — 10 10.00 — 12 12.00 — 14 14.00 — 16 16.00 — 18 18.00 — 20 20.00 — 24 24.00 — 30 30.00 — 36 36.00 — 42 42.00 — 48 48.00 — 54 54.00 48.00 in.

Table 3

in.

in.

Minimum Minimum Reduced Nominal Full Waterway Waterway Valve Size Diameter Diameter 75 76.2 — 100 101.6 — 150 152.4 — 200 203.2 — 250 254.0 — 300 304.8 — 350 355.6 — 400 406.4 — 450 457.2 — 500 508.0 — 600 609.6 — 750 762.0 — 900 914.4 — 1,050 1,066.8 — 1,200 1,219.2 — 1,350 1,371.6 1,219.2 mm

Minimum thickness of body and bonnet

Nominal Valve Size

in.

3 4 6 8 10 12 14 16 18 20 24 30 36 42 48 54

(mm)

(75) (100) (150) (200) (250) (300) (350) (400) (450) (500) (600) (750) (900) (1,050) (1,200) (1,350)

*

* Nominal valve size mm is soft conversion (nominal in. size × 25). † Minimum metal thickness mm is hard conversion (in. × 25.4).

mm

mm

Minimum Metal Tickness in.

0.30 0.31 0.32 0.34 0.36 0.38 0.45 0.50 0.5 6 0.5 6 0.62 1.06 1.31 1.42 1.44 1.44

(mm)

(7.6) (7.9) (8.1) (8.6) (9.1) (9.7) (11.4) (12.7) (14.2) (14.2) (15.7) (26.9) (33.3) (36.0) (39.6) (39.6)

Copyright © 201 6 American Water Works Association. All Rights Reserved.

†

REDUCED-WALL, RESILI EN T-SE ATED G ATE VALVES FOR WATER SUPPLY SERVI CE 

Table 4

13

Minimum thickness for ductile-iron connecting end fanges

Nominal Valve Sizes

in.

4 6 8 10 12 14 16 18 20 24 30 36 42 48 54

* (100) (150) (200) (250) (300) (350) (400) (450) (500) (600) (750) (900) (1,050) (1,200) (1,350) (mm)

* Nominal valve size mm is soft conversion (nominal in. size × 25). † Flange thickness mm is hard conversion (in. × 25.4).

Flange Tickness

in.

¾ ¾

7 15/1 6

1 1 1 1 11 13/ 6 1 1¾ 2 21 2 1

3

3

(mm)

†

(19.1) (19.1) (22.2) (23.8) (25.4) (25.4) (25.4) (25.4) (28.6) (30.1) (34.9) (44.5) (50.8) (54.0) (60.3)

4.4.1 .3.3 A nonmetallic surface shall be epoxy coating. 4.4.1 .4 Valve end connections. Except as agreed upon by the purchaser and supplier, valve end connections shall conform to the requirements of one of the following end connection types. 4.4.1 .4.1 Flanged ends: 1. Te thickness of ductile-iron end fanges may be less than specifed in ASME B16.1 or ANSI/AWWA C110/A21.1 0 but not less than shown in Table 4. 2. Other dimensions and drilling of end fanges of fanged valves shall conform to ASME B16.1 Class 125, ANSI/AWWA C207, or ANSI/AWWA C110/ A21.10 except as modifed by the purchase documents. 3. Unless spot facing is required by the purchase documents, the bolt holes of the end fanges shall not be spot faced except: a. When the thickness at any point within the spot-face area, as defned in MSS SP-9, exceeds the required minimum fange thickness by more than indicated in Table 5 or if the fange is not sufciently fat. b. When the bearing surfaces for bolting, as defned as the minimum spotface diameter according to bolt size in MSS SP-9, are not parallel within 3 degrees of the fange face. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

Table 5

Excess

fange thickness

Nominal Valve Size

Excess Tickness (maximum)

* 3–12 (75–300) 1 14–24 (350–600) 3/ 6 30–54 (750–1,350) ¼ * Nominal valve size mm is soft conversion (nominal in. size × 25). † Excess thickness mm is hard conversion (in. × 25.4). in.

(mm)

in.

1

(mm)

†

(3.2) (4.8) (6.4)

c. If the foregoing requirements are not met, either spot facing or backfacing shall be used to meet the requirements. 4. When required, spot facing shall be done in accordance with MSS SP-9. 5. Bolt holes shall straddle the vertical centerline of the valve, unless otherwise specifed by the purchaser. 6. Te laying lengths of fanged valves 12 in. (300 mm) and smaller shall conform to the requirements for double-disc gate valves listed in Table 1 of ASME B16.1 0. 4.4.1 .4.2 Mechanical-joint ends: 1. Mechanical-joint bell dimensions shall conform to ANSI/AWWA C111/ A21.11 or ANSI/AWWA C153/A21.53. 2. Slots with the same width as the diameter of the bolt holes may be provided instead of holes in the bell fange where the valve body and bonnet interfere with the joint assembly. 4.4.1 .4.3 Push-on joints shall conform to the requirements of ANSI/ AWWA C111/A21.11. 4.4.1 .4.4 Tapping valve ends: 1. Te end fange of a tapping valve that forms a joint with the tapping sleeve shall conform to the dimensions of MSS SP-60 in sizes 3-in. (75-mm) through 12-in. (300-mm) NPS. For larger sizes, fange dimensions shall be as agreed to by the purchaser and supplier. 2. Te connecting fange of the tapping valve mating with the tapping machine must be parallel and concentric with the opposite fange and concentric with the waterway to provide proper alignment for the tapping operation. 3. Te end fange of a tapping valve that forms a joint with the tapping machine shall conform to the dimensions of MSS SP-113. 4.4.1 .5 Yokes on OS&Y valves. On OS&Y valves, the yokes on bonnets may be integral or of bolted-on construction. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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4.4.1 .5.1 If the yoke is not an integral part of the bonnet, it shall be made of ductile iron or gray iron. 4.4.1 .5.2 Te design shall be such that a hand cannot be jammed between a yoke and the handwheel. 4.4.2 Gate. Te material of the gate shall be ductile iron, gray iron, or copper alloy (see Table 6 for copper alloys). 4.4.2.1 Resilient seats. Resilient seats shall be bonded or mechanically attached to the gate. 4.4.2.1 .1 Te proof-of-design test method used for bonding or vulcanizing shall be AS TM D429, either Method A or Method B. 4.4.2.1 .2 For Method A, the minimum strength shall not be less than 250 psi (1,725 kPa). 4.4.2.1 .3 For Method B, the peel strength shall not be less than 75 lb/in. (13.2 N/mm). 4.4.2.1 .4 Exposed mechanical attaching devices and hardware used to retain the resilient seat shall be of a corrosion-resistant material. 4.4.3 Guides. If guiding is required to obtain shutof, the design shall be such that corrosion in the guide area does not afect seating. 4.4.4 Bolting. Bolting materials, excluding joint accessories, shall meet the mechanical strength requirements of AS TM A307 and shall have either regular square, hexagonal, or socket heads with dimensions conforming to ASME B18.2.1 , ASME B18.2.3.1 M, ASME B18.3, or ASME B18.3.1 M. 4.4.4.1 Corrosion resistance. Bolts, studs, and nuts shall be zinc-coated (ASTM A153 or AS TM B633) or made corrosion resistant by some other process disclosed to and acceptable to the purchaser. 4.4.4.1 .1 Te purchaser may specify bolts, studs, and nuts made from a specifed corrosion-resistant material, such as low-zinc bronze, nickel-copper alloy, or stainless steel. 4.4.4.1.2 Stainless-steel bolts and studs shall not be used on stainless-steel nuts unless the threads are coated with an antiseize compound or the fastening components are made of diferent alloys or some other means are used to prevent galling. 4.4.4.2 Recessed sockets. Recessed socket in bolts shall be plugged and/or sealed. 4.4.5 Stem, stem nut, and thrust collar. Copper alloy stems, stem nuts, thrust collars, and gates shall be made from an alloy listed in Table 6. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

Table 6

Stem, gate, thrust collar, and stem nut copper alloys

Copper Alloy* AS TM Specifcation Number Alloy Designation AS TM B16 UNS C36000 AS TM B138 UNS C67500 Stems, Gates, and Trust Collars AS TM B283 UNS C67600 AS TM B98 UNS C66100 UNS C86200 AS TM B148 UNS C95200 UNS C95300 UNS C95500 AS TM B584 UNS C86200† UNS C86500† UNS C86700 UNS C87500 UNS C87600 UNS C87610 AS TM B763 UNS C86200† UNS C86500† UNS C86700 UNS C99400 UNS C99500 AS TM B62 UNS C83600 AS TM B824 UNS C84400† Stem Nuts and Gates AS TM B124 UNS C37700 AS TM B148 UNS C95200 UNS C95300 UNS C95500† AS TM B584 UNS C84400 UNS C83450† UNS C86700 UNS C87500 UNS C87610 AS TM B763 UNS C86500†† UNS C86700 UNS C95200 UNS C95500 UNS C95800 UNS C99400 UNS C99500

* Alloys actually used or specifed are not limited to those listed—see Sec. 4.2.4.5.2. † Compliance with ANSI/AWWA C515 requires the manufacturer to specify minimum mechanical (yield strength) or chemical (copper and/or zinc) requirements that exceed the minimums required for this alloy by the AS TM specifcation(s) listed. Copyright © 201 6 American Water Works Association. All Rights Reserved.

REDUCED-WALL, RESILI EN T-SE ATED G ATE VALVES FOR WATER SUPPLY SERVI CE 

Table 7

17

Stainless-steel valve stem alloys

AS TM Specifcation Number Alloy Designation* AS TM A276 UNS S30400 AS TM A276 UNS S31600 AS TM A276 UNS S43100 AS TM A473 UNS S30400 AS TM A473 UNS S31600 AS TM A582 UNS S43020 AS TM A743/A743M CF8 J92600 AS TM A743/A743M CF8M J92900 * Alloys actually used or specifed are not limited to those listed—see Sec. 4.2.4.7.

4.4.5.1 Stainless-steel stems. Stainless-steel stems shall be made from an alloy listed in Table 7. 4.4.5.1 .1 When stainless-steel stems are used, the stem, stem nut, and thrust collar materials shall be selected to prevent galling when subjected to the torques given in Table 11. 4.4.5.2 Stem yield strength. Valve stems shall have a yield strength of 20,000 psi (137,800 kPa) or greater. 4.4.5.3 Stem nuts. Stem nuts shall be made from copper alloys that have a yield strength of 14,000 psi (96,500 kPa) or greater (see Table 6). 4.4.5.4 NRS stems. Te stem must have a thrust collar that shall be integral or nonintegral with the stem. 4.4.5.5 OS&Y stems. OS&Y valve stems shall be of sufcient length so as to be at least fush with the top of the stem nut after the gate is fully closed. 4.4.5.5.1 Te design shall prevent any possibility of the gate leaving the stem or the stem turning during the operation of the valve. 4.4.5.6 Treads. Te threads of stems and stem nuts shall be of Acme, modifed Acme, stub Acme, or one-half V type. 4.4.5.6.1 Stems and stem nuts shall be threaded straight and true and shall work true and smooth throughout the lift of opening and thrust of closing the valve. 4.4.5.7 Diameter. Te stem diameters and turns to open shall be as shown in Table 8. 4.4.6 Stem sealing. Te sealing system shall be designed to be watertight at the rated working pressure of the valve. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

Table 8

Minimum diameter of stem and minimum number of turns to open

NRS Valves

Minimum Minimum Diameter Number of Nominal Valve Size of Stem* Turns of Stem § ¶ to Open 3 (75) 0.859 (21.82) 9 4 (100) 0.859 (21.82) 12 6 (150) 1.000 (25.40) 18 8 (200) 1.000 (25.40) 24 10 (250) 1.1 25 (28.58) 30 12 (300) 1.188 (30.18) 36 14 (350) 1.250 (31.75) 42 16 (400) 1.438 (36.53) 48 18 (450) 1.625 (41.28) 54 20 (500) 1.750 (44.45) 40 24 (600) 1.969 (50.01) 48 30 (750) 2.188 (55.58) 60 36 (900) 2.500 (63.50) 72 42 (1,050) 2.750 (69.85) 84 48 (1,200) 3.430 (87.1 2) 96 54** (1,350) 3.430 (87.1 2) 96 54†† (1,350) 3.630 (92.20) 108 in.

(mm)

in.

(mm)

OS&Y Valves Minimum Diameter Minimum of Stem Unthreaded Number of Section and Tread OD† Turns of Stem ¶ to Open‡ ¾ (19.1) 7 1 (25.4) 9 1¼ (28.6) 18 1¼ (31.8) 25 1 (34.9) 31 1 (34.9) 37 1 / 6 (36.5) 42 1½ (38.1) 48 in.

(mm)

3

3

71

* Te diameter of the stem at the base of the thread or at any point below that portion shaped to receive the wrench nut or gear on NRS valves or the minimum diameter of the stem unthreaded section and thread OD for OS&Y valves shall not be less than specifed. † Outside diameter. ‡ Values shown for 6-in. to 12-in. nominal valve sizes are for single-lead threads. If a double-lead thread is used, minimum turns become 13, 17, 21, and 25 for sizes 6-in. to 12-in. NPS inclusive. § Nominal valve size mm is soft conversion (nominal in. size × 25). ¶ Stem diameter mm is hard conversion (in. × 25.4). ** Reduced waterway. †† Full waterway.

4.4.6.1 NRS valves. 4.4.6.1 .1 A stem-seal plate or O-ring packing plate shall be made of ductile iron or gray iron. 4.4.6.1.2 Stem openings, if bushed, or stem-seal cartridges shall be of a copper alloy or a synthetic polymer with physical properties suitable for the application. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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19

4.4.6.1 .3 Stem-seal plate bolts and nuts shall conform to the requirements as specifed in Sec. 4.4.4. 4.4.6.1 .4 On NRS valves, the stem opening, thrust bearing recess, and bonnet face of the stem-seal plate shall be machined or fnished in a manner that will provide surfaces that are smooth and either parallel or perpendicular to the stem axis within 0.5 degrees. 4.4.6.1 .5 When an O-ring or other pressure-actuated stem seal is used, the design shall incorporate at least two such seals. 4.4.6.1 .6 Te dimensions of the O-rings shall be in accordance with ANSI/ SAE AS 568A. 4.4.6.2 OS&Y valves. A stufng box shall be provided to contain stem packing. 4.4.6.2.1 Stufng-box packing shall be made of fax conforming to Fed. Spec. HH-P-106d. Hemp, asbestos, or jute packing shall not be used. 4.4.6.2.2 Stufng boxes shall have a depth not less than the diameter of the valve stem. 4.4.6.2.3 Te internal diameter of the stufng box shall be large enough to contain adequate packing to prevent leakage around the stem. 4.4.6.2.4 Stufng boxes shall be packed properly and ready for service when valves are delivered to the purchaser. 4.4.6.2.5 Stufng-box bolts may need to be adjusted to stop leakage at the time of installation. 4.4.6.3 Packing glands, gland followers, gland bolts, and gland-bolt nuts. Te packing gland assembly shall be of solid, solid-bushed, or two-piece designs. 4.4.6.3.1 Followers may be formed as a fanged end on the gland or as a separate item. 4.4.6.3.2 Packing glands shall be made of a copper alloy, synthetic polymer, gray iron, or ductile iron. 4.4.6.3.3 If a gland follower is used, it shall be made of either ductile iron or gray iron or a copper alloy. 4.4.6.3.4 Gland bolts and nuts shall be according to Sec. 4.4.4. 4.4.6.3.5 Gland-bolt nuts shall be made of a copper alloy or stainless steel. 4.4.6.4 Stem-seal replacement. 4.4.6.4.1 NRS valves shall be designed so that the seal above the stem collar can be replaced with the valve under pressure in the fully open position. 4.4.6.4.2 Design of OS&Y valves shall be such that the stufng box can be packed when the valves are in the fully open position and under pressure. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

4.4.7 Wrench nuts and handwheels. Except as shown in Sec. 4.4.8.6, wrench nuts and handwheels shall be made of gray iron or ductile iron. 4.4.7.1 Nuts. Unless otherwise explicitly required by the purchase documents, the wrench nuts shall be 115/ 6-in. (49.2-mm) square at the top, 2-in. (50.8-mm) square at the base, and 1¾-in. (44.5 -mm) high. 4.4.7.1 .1 Nuts shall have a fanged base on which shall be cast an arrow at least 2-in. (50.8-mm) long showing the direction of the opening. 4.4.7.1 .2 Te word “OPEN” in ½-in. (12.7-mm) or larger letters shall be cast on the nut to indicate clearly the direction to turn the wrench when opening the valve. 4.4.7.2 Handwheels. Handwheels shall be ofthe spoke type only. Webbed or disc types are not permissible. 4.4.7.2.1 Te outside diameter of handwheels shall not be less than those given in Table 9. 4.4.7.2.2 An arrow showing the direction to turn the handwheel to open the valve, with the word “OPEN” in ½-in. (12.7-mm) or larger letters in a break in the arrow shaft, shall be cast on the rim of the handwheel so as to be read easily. 4.4.7.3 Operating mechanism. NRS valves are to be supplied with wrench nuts or handwheels. OS&Y valves are to be supplied with handwheels. 4.4.7.4 Direction of opening. Te standard direction of opening is counterclockwise as viewed from the top. Valves opening in the opposite direction (clockwise) may be specifed. 4.4.7.5 Method of securing. Wrench nuts or handwheels shall be ftted to the valve stem on NRS valves. Handwheels shall be ftted to the stem nut on OS&Y valves. In both cases, they shall be secured by mechanical means. 1

Table 9

Outside diameter of handwheels*

Nominal Valve Size

in.

3 4 6 8 10 12

(mm)

(75) (100) (150) (200) (250) (300)

†

* For sizes larger than 12 in. (300 mm), consult the manufacturer. † Nominal valve size mm is soft conversion (nominal in. size × 25). ‡ Handwheel diameter mm is hard conversion (in. × 25.4).

Minimum Diameter of Handwheel in.

7 10 12 14 16 16

(mm)

‡

(178) (254) (305) (356) (406) (406)

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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4.4.7.6 Color coding. Wrench nuts and handwheels that open the valve by turning to the right (clockwise) shall be painted red, and wrench nuts and handwheels that open the valve by turning to the left (counterclockwise) shall be painted black. 4.4.8 Gearing. If gears are required by the purchase documents, they shall be accurately formed and smooth running, with a pinion shaft operating in a bronze, self-lubricating, or permanently sealed antifriction bearing. 4.4.8.1 Material. Geared valves shall be equipped with steel, ductile-iron, or gray-iron gears. 4.4.8.1 .1 If cast-iron gears are provided, the pinion shall be steel. 4.4.8.1 .2 Material for steel gears shall be AS TM A27 Grade U-60-30 or equivalent. 4.4.8.2 Gear cases. Valves using O-ring or V-type stem seals may have the gear case attached directly to the valve. 4.4.8.2.1 When geared valves are provided, enclosed gear cases are required unless defnitely excluded by the purchaser’s requirements. 4.4.8.3 Indicators. When required by the purchase documents, geared valves shall be equipped with indicators to show the position of the gate in relation to the waterway. 4.4.8.4 Gear ratio. Gear ratios shall not be less than those shown in Table 10. 4.4.8.5 Input torque. Te maximum input torque shall be as recommended by the manufacturer. 4.4.8.6 Wrench nut/handwheel. Geared valves may have a fabricated wrench nut or handwheel with an “open” direction tag and arrow mechanically secured. Table 10

Gear ratios

Nominal Valve Size

* 16–24 (400–600) 30–36 (750–900) 42–54 (1,050–1,350) * Nominal valve size mm is soft conversion (nominal in. size × 25). in.

(mm)

Minimum Gear Ratio 2:1 3:1 4:1

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AW WA C51 5 -1 5

4.4.9

Bypasses.

Bypass sizes vary depending on the type of bypass and the

manufacturer’s valve design. 4.4.9.1

Size.

If a bypass is required by the purchase documents, the

bypass size shall be by agreement between the purchaser and the manufacturer.

Sec. 4.5

Fabrication 4.5.1

Workmanship.

Valve parts shall conform to their required dimensions

and shall be free from defects that could prevent proper functioning of the valve. 4.5.1.1

Interchangeable parts.

Like parts of valves of the same model and

size produced by the same manufacturer shall be interchangeable. 4.5.1.2

Castings.

Castings shall be clean and sound without defects that

will weaken their structure or impair their service. 4.5.1.2.1

Plugging, welding, or repairing of cosmetic defects is allowed.

4.5.1.2.2

Repairing of structural defects is not allowed unless agreed to by

the purchaser. 4.5.1.2.3

Repaired valves shall comply with the testing requirements of this

standard. 4.5.1.2.4 4.5.2

Repairs within the bolt circle of any

Coating.

fange face are not allowed.

Interior ferrous surfaces of the body and bonnet that are

in contact with liquid shall be coated with a material conforming to the quali fcation testing requirements of ANSI/AWWA C550 to a minimum average dry

f lm

thickness of 6 mil. 4.5.2.1

Other exposed interior ferrous surfaces.

ferrous surfaces except

Other exposed interior

f nished or bearing surfaces shall be coated with a material

speci fed in Sec. 4.2.4.11. 4.5.2.2

Exterior ferrous surfaces.

A coating material as speci fed in

Sec.  4.2.4.11 shall be applied to exterior ferrous surfaces.

SECTION 5: Sec. 5.1

Testing 5.1.1 5.1.1.1

VERIFICATION

Proof-of-design testing. Hydrostatic gate test.

One prototype valve of each size and class

of the manufacturer’s design shall be hydrostatically tested with twice the speci fed rated pressure applied to one side of the gate and zero pressure on the other side.

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REDUCED-WALL, RESI LIEN T-SEATED G ATE VALVES FOR WATER SUPPLY SERVI CE 

Table 11

Proof-of-design torque

Nominal Valve Size

in.

3–4 6–12 14–24 30 36 42 48 54‡ 54§

* (75–100) (150–300) (350–600) (750) (900) (1,050) (1,200) 1,200 1,350 (mm)

* Nominal valve size mm is soft conversion (nominal in. size × 25). † Torque Nm is rounded to nearest 5 Nm (ft-lb × 1.356). ‡ Reduced waterway. § Full waterway.

Design Torque ft-lb

250 350 400 500 600 700 800 800 1,000

(Nm)

23

†

(340) (475) (545) (680) (820) (950) (1,085) (1,085) (1,355)

5.1 .1 .1 .1 Te test is to be made in each direction across the gate for a minimum period of 5 minutes. 5.1 .1 .1 .2 Te manufacturer may make special provisions to prevent leakage past the seats. 5.1 .1 .1 .3 No part of the valve or gate shall remain visually deformed by the test. 5.1 .1 .2 Torque test. A prototype of each size shall be overtorqued in the closed and open positions to demonstrate that no distortion of the valve stem or thrust collar or damage to the resilient seat occurred as evidenced by the failure to seal at the rated pressure. 5.1 .1 .2.1 Te torque applied to the main valve stem shall be in accordance with Table 11. 5.1 .1 .2.2 For valves using stainless-steel stems, upon disassembly there shall be no visible evidence of galling on the stem, thrust collar, or stem nut after completion of the torque test. 5.1 .1 .3 Leakage test. One prototype valve of each size shall be fully opened and closed to a seal for 500 complete cycles with sufcient fow that the valve is at the rated working pressure for the pressure diferential at the point of closing. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

5.1 .1 .3.1 Te valves shall be drip-tight under the rated pressure diferential applied alternately to each side of the gate after the completion of the tests. 5.1 .1 .4 Hydrostatic shell test. One prototype of each valve size shall be tested to 2.5 times the rated working pressure with the gate in the open position. 5.1 .1 .4.1 For a period of 5 minutes, there shall be no rupture or cracking of the valve body, valve bonnet, or seal plate. 5.1 .1 .4.2 Leakage at pressure-containing joints shall not be a cause for failure of the test. 5.1 .1 .4.3 No part of the valve shall remain visibly deformed after the test. 5.1 .2 Production testing. After manufacture, each gate valve shall be subjected to operation and hydrostatic tests at the manufacturer’s plant as specifed in this section. 5.1 .2.1 Operation test. Each valve shall be operated through a complete cycle to ensure proper functioning of parts. 5.1 .2.1 .1 Any defects in workmanship shall be corrected, and the test repeated until a satisfactory performance is demonstrated. 5.1 .2.2 Shell test. A hydrostatic test pressure equal to twice the rated working pressure of the valve shall be applied to the assembled valve with the gate in the open position. 5.1.2.2.1 Te test shall show no leakage through the metal pressurecontaining joints or stem seals. 5.1 .2.3 Seat test. A hydrostatic test shall be made from each direction at a minimum of the rated working pressure to prove the sealing ability of each valve from both directions of fow. 5.1.2.3.1 Te test shall show no leakage through the metal pressurecontaining joints or past the seat. Sec. 5.2

Plant Inspection and Rejection

5.2.1 Plant inspection. Work performed according to this standard, except prototype testing, shall be subject to inspection and acceptance by the purchaser, who shall have access to places of manufacture where these valves are being produced and tested. 5.2.2 Rejection. Any valve or part that may be determined as not conforming to the requirements of this standard shall be made satisfactory, or it shall be rejected and repaired or replaced by the manufacturer. 5.2.2.1 Repair. Repaired valves must be acceptable to the purchaser and specifcally accepted when submitted or resubmitted. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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5.2.3 Afdavit ofcompliance. Whether the purchaser has a representative at the plant or not, an afdavit of compliance may be required from the manufacturer as provided in Sec. 6.3 of this standard. SECTION 6:

DELIVERY

Sec. 6.1

Marking

Sec. 6.2

Preparation for Shipment

Sec. 6.3

A davit of Compliance

6.1 .1 Markings. Markings shall be cast on the bonnet or body or provided on a corrosion-resistant tag afxed to each valve. 6.1 .1 .1 Requirements. Markings shall show the manufacturer’s name or mark, the year the valve was made, the size of the valve, the letters “C515,” and the designation of working water pressure; for example, “200W.” 6.1 .1 .1 .1 Special markings in addition to these can be supplied when specifed by the purchaser’s requirements on agreement between purchaser and manufacturer. 6.2.1 Completeness. Valves shall be complete in detail when shipped. 6.2.1 .1 Draining. Valves shall be drained before shipment. 6.2.1 .2 Separate packaging. Handwheels and valve accessories may be packed separately.

f

Te manufacturer shall, when required by the purchase documents, provide the purchaser with an afdavit stating that the valve and materials used in its construction conform to the applicable requirements of this standard and the purchase documents and that tests specifed in this standard have been performed and test requirements have been met.

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APPENDIX A Installation, Operation, and Maintenance of Reduced-Wall, Resilient-Seated Gate Valves Tis appendix is for information only and is not a part ofANSI/AWWA C515.

SECTION A.1 : GENERAL

Resilient-seated gate valves form a signifcant component part of many frefghting or water-distribution systems. Failure of a resilient-seated gate valve in these systems, either as a result of faulty installation or improper maintenance, could result in extensive damage and costly repairs. In addition, many resilientseated gate valves are installed in buried-service or underground applications. Problems or malfunctions of the valves because of faulty installation or improper maintenance can result in extensive and costly unearthing operations to efectively correct or eliminate the problem. Many resilient-seated gate-valve problems and failures can be traced back to improper handling, storage, installation, operation, or maintenance procedures. SECTION A.2: UNLOADING

Valves should be unloaded carefully. Each valve should be carefully lowered from the truck to the ground; it should not be dropped. In the case of larger valves, forklifts or slings around the body of the valve or under the skids should be used for unloading. Only hoists and slings with adequate load capacity to handle the weight of the valve or valves should be used. Hoists should not be hooked into or chains fastened around yokes, gearing, motors, cylinders, or handwheels. Failure to carefully follow these recommendations is likely to result in damage to the valve. SECTION A.3: RECEIVING INSPECTION

Resilient-seated gate valves should be inspected at the time of receipt for damage during shipment. Te initial inspection should verify compliance with 27

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

speci fcations, direction of opening, size and shape of operating nut, number of turns to open or close, and type of end connections. A visual inspection of the seating surfaces should be performed to detect any damage during shipment or scoring of the seating surfaces. Inspection personnel should look for bent stems, broken handwheels, cracked parts, loose bolts, missing parts and accessories, and any other evidence of mishandling during shipment. Each valve should be operated through one complete opening-and-closing cycle in the position in which it is to be installed.

SECTION A.4: STORAGE Valves should be stored indoors. If outside storage is required, the valves should be protected from weather elements. During outside storage, they should be protected from the weather, sunlight, ozone, and foreign materials. In colder climates where valves may be subject to freezing temperatures, it is absolutely essential to prevent water from collecting in the valves. Failure to do so may result in a cracked valve casting or deterioration of the resilient-seat material.

SECTION A.5: INSTALLATION Instructions supplied by manufacturers should be reviewed in detail before valves are installed. At the jobsite prior to installation, each valve should be visually inspected and any foreign material in the interior portion of the valve should be removed. A detailed inspection of the valve as outlined in Sec. A.3 should be performed prior to installation.

Sec. A.5.1

Bolts Bolts should be checked for proper tightness and protected by the installer to prevent corrosion, either with a suitable paint, bitumastic material, and/or by polyethylene wrapping or other suitable means of corrosion protection.

Sec. A.5.2

Underground Installation Valves in water-distribution lines shall, where practical, be located in easily accessible areas. A.5.2.1

During installation, there is the possibility of foreign materials in-

advertently entering the valve. Foreign material can damage internal working parts during operation of the gate valve. For this reason, gate valves should be installed

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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in the closed position. Each valve should be placed on frm footing in the trench to prevent settling and excessive strain on the connection to the pipe. Piping systems should be supported and aligned to avoid damage to the valve. A.5.2.2 A valve box or vault should be provided for each valve used in a buried-service application. Te valve box should be installed so as not to transmit loads or stress to the valve, valve stem, or piping system. Te valve box should be centered over the operating nut of the valve with the box cover fush with the surface of the fnished area or another level as directed by the purchaser. Valve boxes should be designed so that a trafc load on the top of the box is not transmitted to the valve stem or piping system. A.5.2.3 Valves buried in unusually deep trenches have special provisions for operating the valve. Tese are either a riser on the stem to permit a normal key to be used or a notation on valve records that a long key will be required. A.5.2.4 When valves with exposed gearing or operating mechanisms are installed belowground, a vault designed to allow pipe clearance and prevent settling on the pipe should be provided. Te operating nut should be accessible from the top opening of the vault with a valve key. Te size of the vault should provide for easy removal of the valve bonnet and internal parts of the valve for purposes of repair. Consideration should be given to the possible entry of groundwater or surface water and to the need to provide for the disposal thereof. Sec. A.5.3

Aboveground Installation

Sec. A.5.4

Inspection

Sec. A.5.5

Testing

Valves installed aboveground or in a plant piping system should be supported and aligned to avoid damage to the valve. Valves should not be used to correct misalignment of piping. After installation and before pressurization of the valve, pressure-containing bolting (bonnet, seal plate, packing gland, and end connections) should be inspected for adequate tightness to prevent leakage. In addition, an inspection should be made for adequate tightness of tapped and plugged openings to the valve interior. Proper inspection at this time will minimize the possibility of leaks after the piping system has been pressurized. o prevent time lost searching for leaks, it is recommended that valve excavations not be backflled until pressure tests have been completed. After installation, it is desirable to test newly installed piping sections, including valves, at T

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

some pressure above the system design pressure. Te test pressure should not exceed the rated working pressure of the valve. After the test, steps should be taken to relieve any trapped pressure in the body of the valve. Te resilient-seated gate valve should not be operated in either the opening or closing directions at diferential pressures above the rated working pressure. It should be noted that valves seat better at or near the rated working pressure of the valve. In addition, wear or foreign material may damage valve seating surfaces and may cause leakage (see ANSI/AWWA C600). Sec. A.5.6

Records

Sec. A.5.7

Application Hazards

Once the valve is installed, the valve location, size, make, type, date of installation, number of turns to open, direction of opening, and other information deemed pertinent should be entered on permanent records. Resilient-seated gate valves should not be installed in applications or for service other than those recommended by the manufacturer. Te following list of precautions is not inclusive but will help avoid some applications hazards. A.5.7.1 Resilient-seated gate valves should not be installed in lines where service pressure will exceed the rated working pressure of the valve. A.5.7.2 Resilient-seated gate valves should not be used for throttling service unless the design is specifcally recommended for that purpose or accepted in advance by the manufacturer. A.5.7.3 Resilient-seated gate valves should not be used in applications that are exposed to freezing temperatures unless sufcient fow is maintained through the valve or other protection is provided to prevent freezing. A.5.7.4 Pipe, fttings, and valves installed in underground piping are generally joined with push-on or mechanical joints. Tese joints are considered unrestrained-type joints because no signifcant restraint against longitudinal separation is provided. Gate valves should not be installed at a dead end or near a bend in a pipeline without proper and adequate restraint to support the valve and prevent it from blowing of the end of the line. Rigid piping systems incorporating fanged valves are not recommended for buried service. Trust blocks, restrained joints, or other means of restraint are needed on or adjacent to valves on pipelines; or where unusual conditions exist, such as high internal pressures, adjacent fttings, or unsuitable soils; or as a means to anchor a pressurized pipe section when an adjacent section is depressurized to be modifed or repaired. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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A.5.7.5 To prevent damage, 3-in. (75-mm) NPS and 4-in. (100-mm) NPS resilient-seated gate valves should not be operated with input torques greater than 200 ft-lb (270 Nm). Gate valves 6-in. (150-mm) NPS to 16-in. (400-mm) NPS should not be operated with input torques greater than 300 ft-lb (406 Nm). For valves larger than 16 in. (400 mm), consult the manufacturer. SECTION A.6: MAINTENANCE Sec. A.6.1

Valve Exercising

Sec. A.6.2

Inspection

Each valve should be operated through a full cycle and returned to its normal position on a time schedule that is designed to prevent a buildup of tuberculation or other deposits that could render the valve inoperable or prevent a tight shutof. Te interval of time between operations of valves in critical locations or valves subjected to severe operating conditions should be shorter than for other less important installations, but it can be whatever time period is found to be satisfactory based on local experience. Te number of turns required to complete the operation cycle should be recorded and compared with permanent installation records to ensure full gate travel. When using portable auxiliary power actuators with input torque capacities exceeding the maximum operating torques recommended in Sec. A.5.7.5, extreme care should be taken to avoid applying excessive torque to the valve stem. If the actuator has a torque-limiting device, it should be set below the values in Sec. A.5.7.5. If there is no torque-limiting device, the recommended practice is to stop the power actuator three or four turns before the valve is fully opened or fully closed and complete the operation manually. Maintenance should be performed at the time a malfunction is discovered to avoid a return trip to the same valve or to prevent neglecting it altogether. A recording system should be adopted that provides a written record of valve location, condition, maintenance, and each subsequent inspection of the valve. Each valve should be operated through one complete operating cycle. If the stem action is tight, the operation should be repeated several times until proper operation is achieved. With the gate in the partially open position, a visual inspection should be performed, where practical, to check for leakage at joints, connections, and areas of packing or seals. If leakage is observed, defective O-rings, seals,

Copyright © 201 6 American Water Works Association. All Rights Reserved.

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AWWA C51 5 -1 5

gaskets, or end-connection sealing members should be replaced. If the leakage cannot be corrected immediately, the nature of the leakage should be reported promptly to those who are responsible for repairs. If the valve is inoperable or irreparable, its location should be clearly established to prevent loss of time for repair crews. Te condition of the valve and, if possible, the gate position should be reported to the personnel responsible for repairs. In addition, fre departments and other appropriate municipal departments should be informed that the valve is out of service. Sec. A.6.3

Record Keeping

o carry out a meaningful inspection and maintenance program, it is essential that the location, make, type, size, and date of installation of each valve be recorded. Depending on the type of record-keeping system used, other information may be entered in the permanent record. When a resilient-seated gate valve is inspected, an entry should be made in the permanent record indicating date of inspection and condition of the valve. If repair work is necessary, it should be indicated; and on completion of the work, the nature of the repairs and date completed should be recorded. T

SECTION A.7: REPAIRS

Leakage, broken parts, hard operation, and other major defects should be corrected by a repair crew as soon as possible after the defect is reported. If repairs are to be performed in the feld, the repair crew should take a full complement of spare parts to the jobsite. Provisions should be made to isolate the defective valve from water pressure and relieve internal trapped pressure prior to performing any corrective maintenance. Disassembly of the valve should be accomplished in accordance with the procedure supplied by the manufacturer. After repair of the valve, the operating mechanism should be cycled through one complete operating cycle. With full line pressure applied to the valve in the open position, an inspection should be made to detect leakage in the areas around the seal plate, bonnet, packing gland, and body-end connections. A record should be made to indicate that the valve has been repaired and is in working condition. Any markings that the valve is inoperable should be deleted. In addition, fre departments and other appropriate municipal departments should be informed of the satisfactory repair of the valve. Copyright © 201 6 American Water Works Association. All Rights Reserved.

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