AWWA C500-2002 供水系统用金属密封闸阀.pdf

ANSI/AWWA C500-O2 Revision of ANSI/AWWA C500-93 Amer kan Water Works Association The Authoritative Resource for Safe Drinking WaterCM A WA Standard Metal-Seated Gate Valves for Water Supply Service -I i r n W - 3 1 Amerlcan Natlonal Siandards Institute Effective date Jan. 1 , 2003. First edition approved by AWWA Board of Directors June 24, 1913. This edition approved June 16, 2002. Approved by American National Standards Institute Oct. 29, 2002. 6666 West Quincy Avenue Denver, CO 80235-3098 T 1.800.926.7337 www.awwa.org Advocacy Communications Conferences Education and Training tlcience and Technology Sections 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 ination normally contained in specifications. The AWWA standards usually contain options that must be uated by the user of the standard. Until each optional feature is specified by the user, the product or service is not fully defined. AWWA publication of a standard does not constitute endorsement of any product or product type, nor does AWWA test, certify, or approve any product. The use of AWWA standards is entirely voluntary. AWWA standards are intended to represent a consensus of the water supply industry that the product described will provide satisfactory service. When AWWA revises or withdraws this standard, an official notice of action will be placed on the first page of the classified advertising section of Journal AWWA. The action becomes effective on the first day of the month following the month of Journal AWWA publication of the official notice. American National Standard An American National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of an American National Standard does not in any respect preclude anyone, whether that person has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not coning 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 conity with an American National Standard are encouraged to state on their own responsibility in advertising and promotional materials or on tags or labels that the goods are produced in conity with particular American National Standards. CAUTION NOTICE The American National Standards Institute ANSI approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Standard may be revised or withdrawn at 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 ination on all standards by calling or writing the American National Standards Institute, 25 W. 43rd St., Fourth Floor, New York, NY 10036; 212 642-4900. Science and Technology AWWA unites the drinking water community by developing and distributing authoritative scientific and technological knowledge. Through its members, AWWA develops industry standards for products and processes that advance public health and safety. AWWA also provides quality improvement programs for water and wastewater utilities. All rights reserved. No part of this publication may be reproduced or transmitted in any or by any means, electronic or mechanical, including photocopy, recording, or any ination or retri system, except in the of brief excerpts or quotations for review purposes, without the written permission of the publisher. Copyright O 2002 by American Water Works Association Printed in USA II 标准分享网 w w w .b z f x w .c o m 免费下载 Committee Personnel The 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 Thomas M. Bowen, Vice-Chair Roland L. Larkin, Secretary Consumer Members S.K. Batra, Detroit Water and Sewerage Department, Detroit, Mich. M.O. Beagle, Lansing Board of Water and Light, Lansing, Mich. T.M. Bowen, Manchester Water Works, Manchester, N.H. M.H. Burns, Denver, Colo. K.W. Gruber, East Bay Municipal Utility District, Oakland, Calif. C.H. Kersey, Tucker Young Jackson Tul1 Inc., Detroit, Mich. S.D. Tucker, Los Angeles Water and Power, Los Angeles, Calif. General Interest Members R.L. Claudy Jr., Orlando Utilities Commission, Orlando, Fla. J.V. Fonley, Orange County Water District, Orange, Calif. J.J. Gemin, Earth Tech Canada Inc., Kitchener, Ont. S.J. Medlar, Camp Dresser Flax or Hemp. Fed. Spec. TT-C-494b-Coating Compound, Bituminous, Solvent Type, Acid MSSt SP-9-Spot Facing for Bronze, Iron, and Steel Flanges. MSS SP-60-Connecting Flange Joint Between Tapping Sleeves and Tapping Resistant. Valves. SECTION 3 DEFINITIONS In this standard, the following definitions shall apply 1. Cosmetic dect A blemish that has no effect on the ability of a component to meet the structural design and production test requirements of this standard. If the blemish or the activity of plugging, welding, grinding, or repairing the blemish causes the component to fail these requirements, then the blemish shall be considered a structural defect. *Federal Specification available from Naval Publications and s Center, 580 1 Tabor Ave., Philadelphia, PA i 9 120. Manufacturers Standardization Society of the Valve and Fittings Industry Inc., 127 Park St. N.E., Vienna, VA 22180. 标准分享网 w w w .b z f x w .c o m 免费下载 METAL-SEATED GATE VALVES 5 2. Flanged joint The flanged and bolted joint as detailed in ANSIIAWA CllO/A21.10 or ANSI B16.1, class 125. 3. Hub-end bell-and-spigot joint The poured or caulked joint as described in Sec. 4.4.3.1. 4. Manufdcturer The party that manufactures, fabricates, or produces materials or products. 5. Mechanical joint The gasketed and bolted joint as described in ANSI/ A W A C111/A21.11. 6. NPS Nominal pipe size. 7. Purchaser The person, company, or organization that purchases any materials or work to be pered. 8. Push-on joint A W A C111/A21.11. The single rubber gasket joint as described in ANSI/ 9. Structural d e A flaw that causes a component to fail the structural design or test requirements of this standard. This includes, but is 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. 10. Tipping valves 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 pipe dry or under pressure. SECTION 4 REQUIREMENTS Sec. 4.1 Data to Be Supplied by Manufacturer If requested by the purchaser, the manufacturer shall provide the following ination when filling orders for gate valves. 4.1.1 Catalog data. The manufacturer shall supply catalog data, including illustrations and a parts schedule that identifies the materials to be used for making various parts. This ination shall be in sufficient detail to serve as a guide for assembly and disassembly of the valve and for ordering parts. 4.1.2 Weight ination. The manufacturer shall provide a statement of the net assembled weight for each size of valve exclusive of joint accessories. 4.1.3 Assembly drawings. The manufacturer shall to the purchaser one set of drawings showing the principal dimensions, construction details, and 6 AWWAC500-O2 materials used for all parts of the valve. All valves shall be provided in accordance with these drawings after the drawings have been reviewed and accepted by the purchaser. Sec. 4.2 Materials 4.2.1 General. Materials shall comply with the requirements of the Safe Drinking Water Act and other federal, state, and local requirements. Legislation is subject to change. Therefore, it is the manufacturers and purchasers responsibility to veri the current requirements of federal, state, and local regulations. When reference is made to ANSI, ASTM, A W A , or other standards, it shall be understood that the latest revision thereof shall apply. Ail materials used in valves produced according to this standard shall con to the requirements stipulated in the following sections. 4.2.2 Pbysical and cbemicalproperties. The requirements of ANSI, ASTM, AWWA, or other standards to which references are made in this text shall govern the physical and chemical characteristics of the valve components. Whenever valve components are made in conance with AWWA, ANSI, ASTM, or other standards that include test requirements or testing procedures, the manufacturer or supplier shall comply with these requirements or procedures. The records of all tests shall, if required by the purchasers specification, be made available to the purchaser. Gray iron shall equal or exceed the requirement of 4.2.2.1 Gray iron. ASTM A126 class B. 4.2.2.2 Ductile iron. Ductile iron shall con to one of the following standards ASTM A395 or ASTM A536. 4.2.2.2.1 Waters in some areas have promoted corrosion in the of dezincification or dealuminization. Copper alloys that contain more than 16 percent zinc shall not be used in such waters. If aluminum bronze is used, the alloys shall be inhibited against dealuminization. 4.2.2.3 Copper alloys. Copper alloys used in valves shall comply with the following 4.2.2.3.1 Copper alloy valve components shall be made to ASTM-recognized alloy specifications with Unified Numbering System for Metals and Alloys UNS designations. Copper alloys are not limited to those specified in this standard. All copper alloys, however, must meet the perance requirements of this standard, including, but not limited to, minimum yield strength, chemical requirements, and corrosion resistance. 标准分享网 w w w .b z f x w .c o m 免费下载 METAL-SEATED GATE VALVES 7 4.2.2.3.2 Any copper alloy used in the cold-worked condition shall be capable of passing the mercurous nitrate test in accordance with ASTM B154 to minimize susceptibility to stress corrosion. 4.2.2.3.3 Copper alloys that contain more than 16 percent zinc shall not contain less than 57 percent copper 4.2.2.3.4 Copper alloys that contain 16 percent zinc or less shall not contain less than 79 percent copper. 4.2.2.3.5 Valve components manufactured from some grades of manganese, bronze, or some other materials are subject to stress corrosion. The manufacturer shall design the valve and select materials to minimize stress corrosion. 4.2.2.4 Steel. Carbon-steel castings, when used, shall be ASTM A27 grade U-60-30 or equal. 4.2.2.5 Elastomers. Elastomers shall comply with the following 4.2.2.5.1 Rubber shall be resistant to microbiological attack, copper poison- ing, and ozone attack. 4.2.2.5.2 Rubber compounds shall contain no more than 8 ppm parts per million of copper ion and shall include copper inhibitors to prevent copper degradation of the rubber material. 4.2.2.5.3 Rubber compounds shall be capable of withstanding an ozone resistance test when tested in accordance with ASTM D1149. The tests shall be conducted on the unstressed samples for 70 hr at 104F 40C with an ozone concentration of 50 pphm parts per hundred million, and there shall be no visible cracking in the surfaces of the test samples after tests. 4.2.2.5.4 Rubber compounds shall have a maximum compression set value of 20 percent when tested in accordance with ASTM D395 B for 22 hr at 158F 70C. 4.2.2.5.5 Rubber compounds shall contain no more than 1.5 parts of wax per 100 parts of rubber hydrocarbon and shall have less than a 2 percent volume increase when tested in accordance with ASTM D471 after being immersed in distilled water at 73.4“F 2 2F 23C f 1C for 70 hr. Reclaimed rubber shall not be used. 4.2.2.5.6 Rubber compounds shall be free from vegetable oils, vegetable-oil derivatives, animal fats, and animal oils. 4.2.2.6 Gaskets. Gasket material shall be made of inorganic mineral fiber, rubber composition, or paper that is free from corrosive ingredients. O-rings or other suitable elastomeric seals may be used for gaskets. 8 AWAC500-O2 4.2.2.7 O-rings. O-rings shall meet the requirements of ASTM D2000 and have physical properties suitable for the application. . 4.2.2.8 Coatings. Unless otherwise specified by the purchaser, valve coatings as specified in Sec. 4.5.2 shall at a minimum con to Federal Specification TT-C-494b or AWWA C550. Sec. 4.3 General Design 4.3.1 Structural design. All parts of all valves shall be designed to withstand, without being structurally damaged, 1 an internal test pressure of twice the rated design working water pressure of the valve and 2 the full rated internal working pressure when the wedge or gates are moved across the seats, under full unbalanced working water pressure from the fully closed position to the point of opening, then to complete closure. In addition to these pressure requirements, the valve assembly and mechanism shall be capable of withstanding an torque as follows 3-in. 75-mm NPS and 4-in. 100-mm NPS-200 ft-lb 270 Nam; 6-in. 15O-mm, 8- in. 200-mm, 10-in. 250-mm, and 12-in. 300-mm NPS-300 ft-lb 406 Nem. For sizes larger than 12 in. 300 mm, consult the manufacturer. All parts, including the body and bonnet, shall be proportioned so that the valve body or bonnet shall not fail if excessive torque is applied to the stem in the closing direction with the valve-disc seated and subjected to the working water pressure. 4.3.2 Size of waterway. With the valve open, an unobstructed waterway shall be provided. The waterway shall have a diameter equal to or larger than the full nominal diameter of the valve, except that if lugs are provided for inserting or removing the body-seat rings, they need not be removed after the valve is assembled. For tapping valves, the size of the waterway shall include appropriate clearance for the diameter of the tapping-machine cutter recommended by the valve manufacturer. Sec. 4.4 Detailed Design 4.4.1 Body and bonnet. 4.4.1.1 Shell thickness. The body and bonnet of valves shall be made of gray iron or ductile iron and shall comply with the requirements of Sec. 4.3.1. Shell- thickness measurements taken at points diametrically opposite to each other shall, when added together and divided by 2, equal or exceed the minimum metal thicknesses given in Table 1. At no point shall shell thickne