1、Gray Iron Pipe Flanges and Flanged FittingsClasses 25, 125, and 250AN AMERICAN NATIONAL STANDARDASME B16.1-2010(Revision of ASME B16.1-2005)INTENTIONALLY LEFT BLANKASME B16.1-2010(Revision of ASME B16.1-2005)Gray Iron PipeFlanges andFlanged FittingsClasses 25, 125, and 250AN AMERICAN NATIONAL STANDA
2、RDThree Park Avenue New York, NY 10016 USADate of Issuance: January 7, 2011The next edition of this Standard is scheduled for publication in 2015. This Standard will becomeeffective 6 months after the Date of Issuance. There will be no addenda issued to this edition.ASME issues written replies to in
3、quiries concerning interpretations of technical aspects of thisStandard. Interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was
4、 developed under procedures accredited as meeting the criteria for American 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 standar
5、d was madeavailable for public review and comment that 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, or activity.ASME does not take any
6、 position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a cod
7、e or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernm
8、ent or industry endorsement of this code or standard.ASME accepts responsibility 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 repro
9、duced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2011 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.
10、A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B16 Committee viiSummary of Changes viii1 Scope . 12 General . 13 PressureTemperature Ratings 14 Size. 35 Marking . 36 Materials 37 Fitting Dimensions and Tolerances 38 Bolt, Nut, and Gasket Dimensions. 49 Hydrostatic Tests 410 Certif
11、ications 5Figures1 Method of Designating 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
12、 Iron Flanged Fittings 124 Dimensions 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
13、Flange and Bolting Dimensions 289 Class 125 Flange and Bolting Dimensions . 2910 Minimum Thread Length . 30Mandatory AppendicesI Dimensions of Fittings in U.S. Customary Units . 31II References 58Nonmandatory AppendixA Quality System Program 59iiiFOREWORDIn 1894, the American Society of Mechanical E
14、ngineers (ASME) adopted a standard flangetemplate (“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 Standardizat
15、ion Society of theValve and Fittings 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 fl
16、anges and flanged fittings for use undersaturated 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
17、 Water Fitters. ASMEpublished this report 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, th
18、e American Engineering Standards Committee, 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 standard
19、s for pipe flanges and fittings (and 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 S
20、ubcommittee 1 (nowSubcommittee A). Following 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 st
21、andard that had been originallyapproved 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
22、American war standard entitled “Pressure 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 iss
23、ued in which ratings were presented 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
24、remaining standard into a single document, 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
25、. A revised edition published as ANSI 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 b
26、y ANSI. Following approval by the ASME 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 flan
27、ge raised-faceheight to 0.25 in. from the 0.06 in. shown previously, and editorial changes to the text.In the 1998 edition of ASME B16.1, Reference Standards have been updated, a Quality SystemProgram Annex has been added, Class 800 has been deleted, and several editorial revisions haveivbeen made.
28、Following approval by ASME B16 Subcommittee B and B16 Main Committee, ANSIapproved this American National Standard 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
29、 or separate forms. Followingapproval of the Standard Committee and ASME, 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 has been separated into its own paragraph withall following para
30、graphs renumbered accordingly, references were updated, and several editorialrevisions have been made. Following approval of the B16 Standards Committee, approval as anAmerican National Standard was given by ANSI on November 17, 2010.All requests for interpretation or suggestions for revision should
31、 be sent to the AdministrativeSecretary B16, The American Society of Mechanical Engineers, Three Park Avenue, New York,NY 10016-5990.v(10) ASME B16 COMMITTEEStandardization of Valves, Flanges, Fittings, Gaskets,and Valve Actuators(The following is the roster of the Committee at the time of approval
32、of this Standard.)STANDARDS COMMITTEE OFFICERSW. B. Bedesem, ChairM. L. Nayyar, Vice ChairD. R. Sharp, SecretarySTANDARDS COMMITTEE PERSONNELR. W. Barnes, Anric Enterprises, Inc.W. B. Bedesem, ExxonMobil Research and Engineering Co.D. F. Buccicone, Elkhart Products Corp.A. M. Cheta, Royal Dutch Shel
33、lM. A. Clark, Nibco, Inc.G. A. Cuccio, Capitol Manufacturing Co.C. E. Davila, Crane Energy Flow SolutionsD. R. Frikken, Becht Engineering Co.R. P. Griffiths, U.S. Coast GuardG. A. Jolly, Vogt Valves/Flowserve Corp.SUBCOMMITTEE B THREADED FITTINGS (EXCEPT STEEL), FLANGES, AND FLANGED FITTINGS (B16)H.
34、 R. Sonderegger, Chair, Fluoroseal, Inc.K. Barron, Vice Chair, Ward ManufacturingC. E. OBrien, Secretary, The American Society of MechanicalEngineersW. Bliss, Tyler Pipe Co.R. W. Bonds, Ductile Iron Pipe Research AssociationM. A. Clark, Nibco, Inc.J. R. Holstrom, Val-Matic Valve and Manufacturing Co
35、.viM. Katcher, Haynes InternationalW. N. McLean, B and L EngineeringT. A. McMahon, Emerson Process ManagementM. L. Nayyar, Bechtel Power Corp.W. H. Patrick, The Dow Chemical Co.R. A. Schmidt, CanadoilH. R. Sonderegger, Fluoroseal, Inc.W. M. Stephan, Flexitallic LPF. R. Volgstadt, Volgstadt and Assoc
36、iates, Inc.D. A. Williams, Southern Co. GenerationR. T. Faircloth, Alternate, Cameron Valves and ManagementA. A. Knapp, A. Knapp and AssociatesR. L. Larkin, American Flow ControlW. H. Levan, Cast Iron Soil Pipe InstituteW. N. McLean, B and L EngineeringJ. K. Schultz, Conine Manufacturing Co., Inc.G.
37、 L. Simmons, Charlotte Pipe and FoundryP. I. McGrath, Jr., Contributing Member, ConsultantCORRESPONDENCE WITH THE B16 COMMITTEEGeneral. ASME Standards are developed and maintained with the intent to represent theconsensus of concerned interests. As such, users of this Standard may interact with the
38、Committeeby requesting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:Secretary, B16 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990As an alternative, inquiries may be submitted vi
39、a e-mail to SecretaryB16asme.org.Proposing Revisions. Revisions are made periodically to the Standard to incorporate changesthat appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.The Committe
40、e welcomes proposals for revisions to this Standard. Such proposals should beas specific as possible, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.Interpretations. Upon request, the B16 Committe
41、e will render an interpretation of any require-ment of the Standard. Interpretations can only be rendered in response to a written request sentto the Secretary of the B16 Standards Committee.The request for interpretation should be clear and unambiguous. It is further recommendedthat the inquirer su
42、bmit his/her request in the following format:Subject: Cite the applicable paragraph number(s) and the topic of the inquiry.Edition: Cite the applicable edition of the Standard for which the interpretation isbeing requested.Question: Phrase the question as a request for an interpretation of a specifi
43、c requirementsuitable for general understanding and use, not as a request for an approvalof a proprietary design or situation. The inquirer may also include any plansor drawings that are necessary to explain the question; however, they shouldnot contain proprietary names or information.Requests that
44、 are not in this format will be rewritten in this format by the Committee priorto being answered, which may inadvertently change the intent of the original request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation i
45、s available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B16 Standards Committee regularly
46、holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.viiASME B16.1-2010SUMMARY OF CHANGESFollowing approval by the ASME B16 Standards Committee, and after public review,ASME B16.1-2010 was approved by the Americ
47、an National Standards Institute onNovember 17, 2010.In this 2010 edition, all paragraphs have been redesignated, all tables have been revised, andcross-references have been updated throughout. All other revisions introduced within the 2010edition of ASME B16.1 are identified by a margin note, (10).P
48、age Location Changevi Committee Roster Updated125 Section 2 (1) Sections 2 through 9 redesignated as 3through 10(2) Paragraphs 1.2 through 1.7redesignated as 2.1 through 2.6 andnew section 2 title added39 Table I-4 Title corrected to read “Class 125”.viii(10)ASME B16.1-2010GRAY IRON PIPE FLANGES AND
49、 FLANGED FITTINGSClasses 25, 125, and 2501 SCOPEThis Standard covers Classes 25, 125, and 250 GrayIron Pipe Flanges and Flanged Fittings. It includes(a) pressuretemperature ratings(b) sizes and method of designating openings ofreducing fittings(c) marking(d) materials(e) dimensions and tolerances(f) bolting and gaskets(g) pressure testing2 GENERAL2.1 ReferencesStandards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix II,which is part of this Standard. It is not considered practi-cal to identify the specific edition of each referenced
