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1、American Water Works Association ANS I/AWWA C 7 50-03 (First Edition) The Authoritative Resource for Safe Drinking Wate$M A W A Stdndard lransit- 1 ime Flowmeters in Full Closed Conduits - - 1 American National Standards Institute Effective date: Aug. 1 , 2003. This edition approved by AWWA Board of
2、 Directors Jan. 19, 2003. Approved by American National Standards Institute June 5, 2003. 6666 West Quincy Avenue Denver, CO 80235-3098 T 1.800.926.7337 www.awwa.org Advocacy Communications Conferences Education and Training b Science and Technology Sections Copyright American Water Works Associatio
3、n Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- AWWA Standard This document is an American Water Works Association (AWWA) standard. It is not a
4、 specification. AWWA standards describe minimum requirements and do not contain all of the engineering and administrative information normally contained in specifications. The AWWA standards usually contain options that must be evaluated by the user of the standard. Until each optional feature is sp
5、ecified 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 repres
6、ent 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 o
7、n 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 ai
8、d 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 conformin
9、g to the standard. American National Standards are subject to periodic review, and users are cautioned to obtain the latest editions. Producers of goods made in conformity with an American National Standard are encouraged to state on their own responsibility in advertising and promotional materials
10、or on tags or labels that the goods are produced in conformity with particular American National Standards. CAUTION NOTICE: The American National Standards Institute (ANSI) approval date on the front cover of this standard indicates completion of the ANSI approval process. This American National Sta
11、ndard may be revised or withdrawn at any time. ANSI procedures require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or w
12、riting 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
13、 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 form or by any means, electronic or mecha
14、nical, including photocopy, recording, or any information or retrieval system, except in the form of brief excerpts or quotations for review purposes, without the written permission of the publisher. Copyright O 2003 by American Water Works Association Printed in USA Copyright American Water Works A
15、ssociation Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- Committee Personnel The AWWA Subcommittee on Ultrasonic Devices, which developed this
16、standard, had the following personnel at the time: Bahram Safa, Chair Ergun Bakall, AKM Consulting Engineers, Irvine, Calif. J.J. Gemin, Earth Tech Inc., Kitchener, Ont. M.D. Kyser, Badger Meter Inc., Tulsa, Okla. Bahram Safa, San Diego, Calif. J.S. Trofatter, Controlotron, Hauppauge, N.Y. ( A W N (
17、 A W N ( A W A ) (AWWA) ( A m A l The AWWA Committee on Rate Type Flowmeters, which reviewed and helped in the development of this standard, had the following personnel at the time: Joseph J. Gemin, Cbair Consumer Members S.F. Sarrouh, City of Cleveland Division of Water, Cleveland, Ohio S.Y. Tung,
18、City of Houston Public Works, Houston, Texas (AWA) ( A W A ) General Interest Members Ergun Bakall, AKM Consulting Engineers, Irvine, Calif. ( A m A l J.A. Casados, Instituto Mexicano de Technolgia del Agua, Progreso, Mor. J.A. Economides,* San Diego County Water Authority, San Diego, Calif. ( A W A
19、 ) (AWWA) J.J. Gemin, Earth Tech Inc., Kitchener, Ont. M.D. Kyser, Mansur Daubert Strella, Tulsa, Okla. PW. Moorman, Black Doppler Effect and Transit-Time. While the Doppler Effect meter is used extensively for water and other fluids containing solid particles, the transit-time ultrasonic flowmeter
20、is receiving increased acceptance in the water industry. I.B. History. In 1985, the American Society of Mechanical Engineers pub- lished the first standard for the transit-time ultrasonic (transit-time) flowmeters. The needs of the water industry differ, in some respects, from other industries, ther
21、efore necessitating the development of an AWWA standard for transit-time flowmeters. In 1990, the AWWA Standards Committee on Rate Type Flowmeters was formed to develop standards for transit-time meters. The Subcommittee on Ultrasonic Meters was later developed for this purpose. The Subcommittee pre
22、pared a first draft of the transit-time flowmeter standard in 1992. The first draft was reviewed and commented on by the Subcommittee members as well as members of the Rate Type Flowmeter Committee. Subsequent drafts were sent out to a number of transit-time flowmeter manufacturers in 1994 for their
23、 review and comments. A 1995 draft addressed these comments, where possible, and was distributed to all who had previously commented on the drafts. A revised draft was presented to the Subcommittee in 1995. The Subcommittee met in January of 1996 to finalize the standard. However, the subcommittee d
24、ecided that leaving the draft open to the general public for review and comment, prior to finalizing the standard, would produce a more thorough standard. The AWWA Journal was considered a suitable medium for reaching the water industry. The Subcommittee changed the format of the standard into an AW
25、W Journal article that was published in the July 1997 edition of the Journal as a Committee Report. The article encouraged the public to vii Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2
26、007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- comment on the contents of the Committee Report. A few written comments were received and were addressed in developing the final draft of the standard. I.C. Acceptance. In May 1985, the US Environmental Protection
27、 Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for all direct and indirect drinking water additives. Other members of the original consortium included the American
28、Water Works Association Research Foundation (AWWARF) and the Conference of State Health and Fvirenmenta! Managers (C.OSHEM). The American Water Works Association (AWA) and the Association of State Drinking Water Administrators (ASDWA) joined later. In the United States, authority to regulate product
29、s 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 effects of products and drinking water additives from such products, state and local agencies may u
30、se various references, including 1. An advisory program formerly administered by USEPA, Office of Drinking Water, discontinued on Apr. 7, 1990. 2. 3. Specific policies of the state or local agency. Two standards developed under the direction of NSF, ANSIt/NSFS 60, Drinking Water Treatment Chemicals-
31、Health Effects, and ANSUNSF 61, Drink- ing Water System Components-Health Effects. Other references, including AWWA standards, Food Chemicals Codex, Water Chemicals Codex, and other standards considered appropriate by the state or local agency. 4. Various certification organizations may be involved
32、in certifjhg products in accordance with ANSUNSF 61. Individual states or local agencies have authority to *Persons in Canada, Mexico, and non-North American countries should contact the appropriate ?American National Standards Institute, 25 W. 43rd St., Fourth Floor, New York, NY 10036. SNSF Intern
33、ational, 789 N. Dixboro Rd., Ann Arbor, MI 48105. 4 Both publications available from National Academy of Sciences, 2102 Constitution Ave. N.W., authority having jurisdiction. Washingron, DC 20418. . v 1 1 1 Copyright American Water Works Association Provided by IHS under license with AWWA Licensee=I
34、HS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- accept or accredit certification organizations within their jurisdiction. Accreditation of certification organizations may vary from jurisdiction t
35、o jurisdiction. Annex A, “Toxicology Review and Evaluation Procedures,” to ANSUNSF 61 does not stipulate a maximum allowable level (MAL) of a contaminant for substances not regulated by a USEPA final maximum contaminant level (MCL). The MALS of an unspecified list of “unregulated contaminants” are b
36、ased on toxicity testing guidelines (noncarcinogens) and risk characterization methodology (carcinogens). Use of Annex A procedures may not always be identical, depending on the certifier. AWWA C750-O3 does not address additives requirements. Thus, users of this standard should consult the appropria
37、te state or local agency having jurisdiction in order to 1. 2. Determine additives requirements, including applicable standards. Determine the status of certifications by all parties offering to cati products for contact with, or treatment of, drinking water. 3. II. Determine current information on
38、product certification. Special Issues. This standard is different in format from other AWWA standards which contain specific requirements for material, dimensions, workman- ship and other physical requirements. Different transit-time flowmeters employ different materials and technologies. The sofnva
39、re and the electronic components of transit-time flowmeters are generally designed to work with the physical characteris- tics of each make of the equipment. III. Use of This Standard. It is the responsibility of the user of an A W A standard to determine that the products described in that standard
40、 are suitable for use in the particular application being considered. 1II.A. Purchaser Options and Alternatives. This standard provides for several options and alternatives that purchasers must designate if they wish to exercise the options or if they have a preference among the alternatives. Also,
41、several items must be specified by the purchasers to describe completely the type, size, and quantity of the transit-time flowmeters required. The following list provides these items. Purchasers should review this list and Appendix A of this standard to make the appropriate provisions in their speci
42、fications to describe specific requirements. 1. Standard used-AWWA Standard C750 for Transit-time Flowmeters, of latest revision. 2. 3. Size of the conduit (Sec. 4.1). Single path or multipath (Sec. 4.3). i x Copyright American Water Works Association Provided by IHS under license with AWWA Licensee
43、=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- 4. Required accuracy (Sec. 4.4.1). 5. Type of transducer (Sec. 4.2.2). 6. Performance requirements (Sec. 4.4). 7. Installation issues (Sec. 4.5.1
44、.4). 8. 1II.B. Modzjcation to Standdrd. Any modification to the provisions, defini- tions, or terminology in this standard must be provided in the purchasers specifications. Affidavit of compliance, if required (Sec. 6.3). IV. V. Comments. P.4ajm Reisions. This is the first edition of this standard.
45、 If you have any comments or questions about this standard, please call the A W A Volunteer and Technical Support Group, (303) 794-771 1, FAX (303) 795-7603, or write to the group at 6666 West Quincy Avenue, Denver, CO 80235-3098, or e-mail standardsawwa.org. X Copyright American Water Works Associa
46、tion Provided by IHS under license with AWWA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/21/2007 07:41:41 MDTNo reproduction or networking permitted without license from IHS -,-,- American Water Works Association ANSI/AWWA C750-O3 (First Edition) A W A Standurd Transit-Ti
47、me Flowmeters in Full Closed Conduits SECTION 1: GENERAL I Sec. 1.1 Scope This standard describes transit-time ultrasonic flowmeters for water supply service application. An ultrasonic flowmeter is a meter that uses acoustic energy signals to measure fluid velocity. There are currently two distinct
48、types of ultrasonic flowmeters available: Doppler-effect and transit-time. The Doppler-effect meter is used extensively for fluids containing solid particles or gases, and the .transit-time flowmeter is used in a wide variety of applications in the water industry. Sec. 1.2 Purpose The purpose of thi
49、s standard is to provide purchasers, manufacturers, and suppliers with the minimum requirements for transit-time flowmeters, including components, performance, calibration, and verification. Sec. 1.3 Application Transit-time flowmeters are used in a wide variety of applications, including raw water, treated water,