1、Gray Iron PipeFlanges andFlanged FittingsClasses 25, 125, and 250AN AMERICAN NATIONAL STANDARDASME B16.1-2015(Revision of ASME B16.1-2010)ASME B16.1-2015(Revision of ASME B16.1-2010)Gray Iron PipeFlanges andFlanged FittingsClasses 25, 125, and 250AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York
2、, NY 10016 USADate of Issuance: December 28, 2015The next edition of this Standard is scheduled for publication in 2020.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Periodically certain actions of the ASME B16 Committee may be published as
3、 Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/ as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items, or to correct ty
4、pographical or grammatical errorsin codes and standards. Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/. There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.This
5、option can be found on the appropriate Committee Page after selecting “Errata” in the “PublicationInformation” section.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 for American
6、 NationalStandards. The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides an opportun
7、ity 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, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in con
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10、ility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without th
11、e prior written permission of the publisher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2015 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B16 Committ
12、ee viiSummary of Changes viiiList of Changes in Record Number Order ix1 Scope . 12 General . 13 PressureTemperature Ratings 14 Size. 25 Marking . 26 Materials 27 Fitting Dimensions and Tolerances 28 Bolt, Nut, and Gasket Dimensions. 49 Hydrostatic Tests 510 Certifications 5Figures1 Method of Designa
13、ting Outlets of Reducing Fittings in Specifications 62 Drain Connections 73 Method of Designating Location of Tapped Holes for Drains When Specified . 8Tables1 PressureTemperature Ratings 92 Class 250 Flange and Bolting Dimensions . 103 Dimensions of Class 25 Gray Iron Flanged Fittings 124 Dimension
14、s of Class 125 Gray Iron Flanged Fittings . 145 Dimensions of Class 250 Gray Iron Flanged Fittings . 196 Dimensions of Anchorage Bases for Straight and Reducing Class 125 Tees 247 Dimensions of Anchorage Bases for Straight and Reducing Class 250 Tees 268 Class 25 Flange and Bolting Dimensions 289 Cl
15、ass 125 Flange and Bolting Dimensions . 2910 Minimum Thread Length . 30Mandatory AppendicesI Dimensions of Fittings in U.S. Customary Units . 31II References 57Nonmandatory AppendixA Quality System Program 58iiiFOREWORDIn 1894, the American Society of Mechanical Engineers (ASME) adopted a standard f
16、langetemplate (“ASME Standard”) for low-pressure service. A “Manufacturers Standard” for pressuresup to 250 psi followed in 1901. Around 1910, a group of fittings manufacturers formed anorganization that was the forerunner of the present Manufacturers Standardization Society of theValve and Fittings
17、 Industry (MSS) and undertook the design of a line of flanged fittings. Adocument covering this work was published in 1912.During the years 19121914, a Joint Committee of the ASME and the Manufacturers Committeeformulated compromise standard dimensions for pipe flanges and flanged fittings for use u
18、ndersaturated steam pressures of 125 psi and 250 psi pressure ranges. The Joint Committees reportwas accepted at a conference attended by representatives of ASME, the Manufacturers Committee,the U.S. government, and the National Association of Master Steam and Hot Water Fitters. ASMEpublished this r
19、eport as the “American Standard for Pipe Flanges, Fittings and Their Bolting”in 1914. In 1918, work was started on standards for 50 lb steam flanges and for 800 lb, 1,200 lb,and 3,000 lb hydraulic flanges, which were subsequently approved by this group.In 1921, the American Engineering Standards Com
20、mittee, later known as the AmericanStandards Association (ASA), United States of America Standards Institute (USAS), and morerecently, the American National Standards Institute (ANSI), organized Sectional Committee B16to unify and further develop national standards for pipe flanges and fittings (and
21、 later for valvesand gaskets). Cosponsors of the B16 Committee were ASME, MSS, and the Heating and PipingContractors Association now the Mechanical Contractors Association of America (MCAA).Work already in progress on flanges and flanged fittings was assigned to Subcommittee 1 (nowSubcommittee A). F
22、ollowing approval by the Subcommittee, the B16 Committee, the cosponsors,and ASA, the standards were published in 1928.In later work, Subcommittee 1 developed the 25 lb Flange and Flanged Fitting Standard(approved in 1931 as ASA B16b2), which replaced the 50 lb standard that had been originallyappro
23、ved in 1918. Work on the 800 lb Hydraulic Flange Standard was published as ASA B16b1in 1931. Revision of thicknesses, tolerances, and service pressure ratings of the 125 lb and 250 lbflanges and flanged fittings led to approval and publication of ASA B16a-1939.An American war standard entitled “Pres
24、sure Ratings for Cast Iron Flanges and FlangedFittings, 125 lb” (ASA B16a1) was published in 1943. A complete review of the 125 lb and 250 lbstandards resulted in new editions of each: ASA B16.1-1948 and ASA B16.2-1948. In 1960, editionsof B16.1 and B16.2 were issued in which ratings were presented
25、in graphic form and specialrequirements were added for testing flanges.A review of all gray iron flange and flanged fittings standards initiated in 1962 resulted in thewithdrawal of B16.16, “300 lb Refrigerant Flanges and Flanged Fittings” and the combining ofthe remaining standard into a single doc
26、ument, with B16.1 and B16.2 coming together asUSAS B16.1-1967. In this edition, the presentation of ratings was restored to tabular form.The increasing use of higher grades of gray iron necessitated the establishment of a second setof ratings for the smaller sizes. A revised edition published as ANS
27、I B16.1-1975 incorporatedthese new ratings along with metric (SI) equivalents for dimensions and minor corrections to the1967 edition text.In 1982, American National Standards Committee B16 was recognized as an ASME Committeeoperating under procedures accredited by ANSI. Following approval by the AS
28、ME B16Subcommittee A and B16 Committee, ANSI approved ASME/ANSI B16.1-1989 on March 8, 1989.Changes included revised marking requirements, revised bolt length increments (12in. ratherthan14in.), elimination of metric equivalents, a correction of the Class 800 flange raised-faceheight to 0.25 in. fro
29、m the 0.06 in. shown previously, and editorial changes to the text.In the 1998 edition of ASME B16.1, Reference Standards were updated, a Quality SystemProgram Annex was added, Class 800 was deleted, and several editorial revisions were made.ivFollowing approval by ASME B16 Subcommittee B and B16 Ma
30、in Committee, ANSI approvedASME B16.1-1998 on November 20, 1998.Work was started in 1999 to revise the standard to include metric units as the primary referenceunits while maintaining U.S. Customary units in either parenthetical or separate forms. Followingapproval of the Standard Committee and ASME
31、, approval as an American National Standardwas given by ANSI on July 8, 2005, with the new designation ASME B16.1-2005.In the 2010 edition of ASME B16.1, the Scope was separated into its own paragraph with allfollowing paragraphs renumbered accordingly, references were updated, and several editorial
32、revisions were made. Following approval of the B16 Standards Committee, approval as anAmerican National Standard was given by ANSI on November 17, 2010.In this 2015 Edition, provisions have been made to provide bolt hole tolerances that are appro-priate to this Standard. Following the approval by th
33、e ASME B16 Standards Committee, approvalas an American National Standard was given by ANSI on July 29, 2015, with the new designationASME B16.1-2015.All requests for interpretation or suggestions for revision should be sent to the AdministrativeSecretary B16, The American Society of Mechanical Engin
34、eers, Two Park Avenue, New York, NY10016-5990.vASME B16 COMMITTEEStandardization of Valves, Flanges, Fittings, Gaskets,and Valve Actuators(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSR. Bojarczuk, ChairC. E. Davila, Vice ChairC.
35、E. OBrien, SecretarySTANDARDS COMMITTEE PERSONNELA. Appleton, Alloy Stainless Products Co., Inc.R. W. Barnes, Anric Enterprises, Inc.K. Barron, Ward ManufacturingW. B. Bedesem, ConsultantR. Bojarczuk, Exxon Mobil Research and Engineering Co.A. M. Cheta, Shell Exploration and Production Co.M. A. Clar
36、k, Nibco, Inc.G. A. Cuccio, Capitol Manufacturing Co.C. E. Davila, Crane EnergyD. R. Frikken, Becht Engineering Co.R. B. Hai, RBH AssociatesK. A. Hettler, U.S. Coast GuardG. A. Jolly, Flowserve/Gestra, USAM. Katcher, Haynes InternationalSUBCOMMITTEE B THREADED FITTINGS (EXCEPT STEEL), FLANGES, AND F
37、LANGED FITTINGS (B16)K. Barron, Chair, Ward ManufacturingG. T. Walden, Vice Chair, WolseleyC. R. Ramcharran, Secretary, The American Society of MechanicalEngineersW. Bliss, Tyler Pipe Co.M. A. Clark, Nibco, Inc.J. R. Holstrom, Val-Matic Valve and Manufacturing Co.viT. A. McMahon, Emerson Process Man
38、agementM. L. Nayyar, NICEC. E. OBrien, The American Society of Mechanical EngineersW. H. Patrick, The Dow Chemical Co.D. W. Rahoi, ConsultantR. A. Schmidt, CanadoilH. R. Sonderegger, Fluoroseal Valves USAW. M. Stephan, Flexitallic LPF. R. Volgstadt, Volgstadt and Associates, Inc.D. A. Williams, Sout
39、hern Co. GenerationF. Feng, Delegate, China Productivity Center for MachineryP. V. Craig, Contributing Member, Jomar GroupB. G. Fabian, Contributing Member, Pennsylvania Machine WorksD. F. Reid, Contributing Member, VSP TechnologiesC. Stout, Contributing Member, Mueller IndustriesD. Hunt, Jr., Faste
40、nalW. H. LeVan, Cast Iron Soil Pipe InstituteJ. K. Schultz, Conine Manufacturing Co., Inc.G. L. Simmons, Charlotte Pipe and FoundryA. A. Knapp, Contributing Member, A. Knapp and AssociatesP. I. McGrath, Jr., Contributing Member, ConsultantCORRESPONDENCE WITH THE B16 COMMITTEEGeneral. ASME Standards
41、are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the Committeeby requesting interpretations, proposing revisions or a Case, and attending Committee meetings.Correspondence should be addressed to:Secretary
42、, B16 Standards CommitteeThe American Society of Mechanical EngineersTwo Park AvenueNew York, NY 10016-5990As an alternative, inquiries may be submitted via e-mail to: SecretaryB16asme.org.Proposing Revisions. Revisions are made periodically to the Standard to incorporate changesthat appear necessar
43、y or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committee welcomes proposals for revisions to this Standard. Such proposals should beas specific as possible, citing the paragraph number(s), the propos
44、ed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.Proposing a Case. Cases may be issued for the purpose of providing alternative rules whenjustified, to permit early implementation of an approved revision when the need is urgent, or toprovid
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