1、STD.ASME B1b12-ENGL199807596700635614905ASME B16.12-1998(Revision of ASME B16.12-1991)CAST IRON THREADEDDRAINAGE FITTINGSAN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersCOPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling Services,September08,200021:17:
2、08STD.ASME B16.12-ENGL19980759b700615616788Date of Issuance:February 19,1999The 1998 edition of this Standard is being issued with an automatic addendasubscription service.The use of addenda allows revisions made in responseto public review comments or committee actions to be published on a regulary
3、early basis;revisions published in addenda will become effective 6 monthsafter the Date of Issuance of the addenda.The next edition of this Standardis scheduled for publication in 2003.ASME issues written replies to inquiries concerning interpretations oftechnical aspects of this Standard.The interp
4、retations will be included withthe above addenda service.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria forAmerican National Standards.The Standards Committee that approved the c
5、ode or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The propcsed code or standard was made available for public reviewand comment that provides an opportunity for additional public input from industry,academia,regulatory
6、 agencies,and the public-at-large.ASME does not approve,rate,or endorseany item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted inconnection with any items mentionedl in this document,and does not undertake to ins
7、ure anyoneutilizing a standard against liability for infringement of any applicable Letters Patent,nor assumesany such liability.Users of a code ostandard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirow
8、n responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or inoustry endorsement of this code or standard.ASME accepts responsibility for ony those interpretations issued in accordance with governingASME procedures a
9、nd policies whi:h precludes the issuance of interpretations by individualvolunteers.No part of this dor:ument may be reproduced in any form,in an electrc nic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Ave
10、nue,New York,NY 10016-5990Copyright1999byTHE AMERICAN SiOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.COPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling Services,September08,200021:17:08STD.ASME B16.12-ENGL19980759b700635617b14FOREWORD(This Foreword is no
11、t part of ASME B16.12-1998.)Screw joint drainage fittings were developed in about 1880 by the Durham House DrainageCompany of New York and are often referred to as Durham fittings.At that time.soilpipes and drains in New York had been required to be of plumbers cast iron soil pipe,whereas Chicagos s
12、oil pipes were required to be of lead or plumbers cast iron pipe.To form a continuous passageway with no pockets or obstructions where foreign mattercould collect and gradually accumulate,it was necessary to design a special type of screwfitting.Inside diameters of the fittings are about the nominal
13、 size of standard weight wroughtsteel pipe(Schedule 40).The thread chamber is designed so that when the pipe is tightlyscrewed into the fitting.its end nearly abuts the shoulder of the fitting,thereby making apractically continuous passage.The threading of these fittings required special care,and th
14、ethreads on the pipe were cut to suit the threads in the fitting.With the passage of time,manufacturerspractices began to diverge in regard to center-to-end dimensions and other features.The Manufacturers Standardization Society of theValve and Fittings Industry(MSS)studied the situation,developed a
15、 standard practice forthese fittings,and published MSS SP-8.Cast Iron Drainage Fittings,in 1929.Subsequently,for better coordination with other screwed fitting standards under the jurisdiction of SectionalCommittee B16 of the American Standards Association(ASA),now the American NationalStandards Ins
16、titute(ANSI),the subject was assigned to Subcommittee 2 of B16.Many drafts of the proposed standard were developed,and printers proofs were distributedto industry for criticism and comment in May 1940.A revised proposal dated July 1941was submitted to the members of the Sectional Committee for lette
17、r ballot vote.Followingits approval by that body,it was submitted to the sponsors and to ASA with recommendationsfor approval as an American Standard.This was granted in February 1942,with thedesignation ASA B16.12-1942.The MSS Ferrous Screw Fittings Committee made a thorough study of the 1942 stand
18、ardand recommended that several changes be made to bring the data in line with currentproduction and usage of this type of fitting.To comply with the recommendations,Subcommittee 2 of Sectional Committee B16 revised portions of the text and illustrationsand added dimensional tables for Tucker connec
19、tions,roof connections.and Tucker Y-branches,as well as dimensions for P-traps,bath traps,and running traps.A draft,dated September 1952,was presented to the Sectional Committee for letter ballotvote.After the committee and other sponsor organizations approved the draft,it was presentedto ASA.and ap
20、proval of ASA B16.12-1953 was granted on September 11,1953.Subcommittee 2 reviewed the document from 1963 to 1964.The Sectional Committeeapproved several minor changes in format and wording,changing the title to Cast IronThreaded Drainage Fittings.ASA B16.12-1965 was approved on November 12,1965In 1
21、970,further review was initiated by Subcommittee 2,now an ANSI Committee,andANSI B16.12-1971 was granted approval on November 1,1971.The standard was updated,and metric(SI)dimensions were added in ANSI B16.12-1977,approved on February 4.1977.iiCOPYRIGHT 2000 American Society of Mechanical EngineersI
22、nformation Handling Services,September08,200021:17:08STD.ASME B1b.12-ENGL19980759b700615616550In 1982,American Standards Committee B16 was reorganized as ASME StandardsCommittee B16 under procedures accredited by ANSI.Also in 1982,Subcommittee B(formerly 2)updated reference standards,and the revisio
23、n was approved on July 20,1983as ANSI B16.12-1983.This edition and later editions are issued on a subscription serviceaddenda basis.which permits revisions made in response to public review comments orCommittee actions to be published as necessary.Addenda revisions become effective sixmonths after t
24、he date of issuance of the addenda.In the 1991 edition of ASME B16.12,reference standards were updated and the metricdimensions were deleted.The edition was approved by ASME and by ANSI on January4,1991.In the 1998 edition of ASME B16.12,reference standards are updated,a quality systemprogram annex
25、is added,and several editorial revisions are made.Following approval byASME B16 Subcommittee B and the B16 Main Committee,ANSI approved this AmericanNational Standard on November 20),1998.All requests for interpretations or suggestions for revisions should be sent to the Secretary.B16 Committee,The American Society of Mechanical Engineers,Three Park Avenue,NewYork,NY10016-5990.ivCOPYRIGHT 2000 American Society of Mechanical EngineersInformation Handling Services,September08,200021:17:08
