1、A N A M E R I C A N N A T I O N A L S T A N D A R D Hydrants for Utility and Maintenance Use ANSI/ASME A112.21.3M-1985(REVISION OF ANSI A112.21.3-1976).-_ _ _ REAFFIRMED 1995 FOR CURRENT COMMIITEE PERSONNEL PLEASE SEE ASME MANUAL AS1 1 SPONSORED AND PUBLISHED BY T H E A M E R I C A N S O C I E T Y O
2、 F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York,N.Y.1001 7 Copyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontro
3、lled when printed.REAFFIRMED 2001FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgDate of Issuance:October 31,1985 This Standard will be revised when the Society approves the issuance of a new edition.There will be no addenda or written interpretations of the requirements of this Standard issu
4、ed to this Edition.Thus code or standard was developed under procedures accredited as meeting the criteria for American National Standards.The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity
5、 to participate.The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not approve,rate,or endorse any item,construction,proprietary device,o
6、r activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent,nor assume an
7、y such liability.Usersof a code or standard are expressly advised that determination of the validity of any such patent rights,and the risk of infringement of such rights,is entirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not
8、 to be interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers.No part of this docume
9、nt may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.Copyright 0 1985 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.Copyrighted material licensed to Stanford University by Thomson
10、Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.FOREWORD(This Foreword is not part of ANSI/ASME A1 12.21.3-1985.)In the broadest definition,a hydrant,as covered by this Standard,is a device with a water
11、 supply shut-off valve and with a means to connect a hose in a safe and sanitary manner.Hy-drants covered herein serve as utility hose terminals for general building and grounds main-tenance.This Standard does not cover fire hydrants(plugs).As the building industry became more sophisticated,it was a
12、pparent that convenient water supply was necessary at various locations in the building walls and in the grounds surrounding the buildings.This requirement spurred the development of hydrants for both wall and ground installations.Two general categories were established:(1)nonfreeze (frost proof)hyd
13、rants designed to be installed in areas which are subject to freezing temperatures;(2)hydrants for wall and ground installations in areas where freezing temperatures are not encountered.Hydrants are equipped with removable operating keys or handles to discourage misuse and vandalism.Many hydrants in
14、stalled directly in the walls of buildings are equipped with attractive func-tional boxes to enclose the hydrant head,thereby concealing the nozzle so that it presents neither a displeasing appearance nor an obstruction on the wall.Ground or yard hydrants are similarly equipped to conceal and protec
15、t the nozzles.Post hydrants were developed to provide easy access to water supply where concealment is not a factor.The American National Standards Committee A1 12 was organized July 27,1955 for the standardization of plumbing materials and equipment.The first organizational meeting was held on July
16、 22,1958.At the meeting on May 1,1964,Panel No.21 was created to establish stan-dards on roof drains,floor drains,backwater valves,and other drainage specialties.Its scope was as follows:the recommendation of suitable existing standards,in cooperation with interested sponsors,or the development of adequate new standards as are needed for roof drains,floor drains,and other drains as used or installed in plumbing systems.The Committee has since been reorganized as an ASME Standards Committee.This