1、AN AMERICAN NATIONAL STANDARD ASME B16.4-2016(Revision of ASME B16.4-2011)Gray Iron Threaded FittingsClasses 125 and 250ASME B16.4-2016(Revision of ASME B16.4-2011)Gray IronThreadedFittingsClasses 125 and 250AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: Novembe
2、r 11, 2016The next edition of this Standard is scheduled for publication in 2021.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 Cases.Cases and interpretations are pu
3、blished 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 typographical or grammatical errorsin cod
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5、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 NationalStandards. The Standards Commi
6、ttee 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 opportunity for additional public input from in
7、dustry, 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 connection with anyitems mentioned in this
8、 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 code or standard are expresslyadvised that determination of the validity of any such patent rights, and the risk of i
9、nfringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of
10、 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 the prior written permission of the publi
11、sher.The American Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2016 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . viCorrespondence With the B16 Committee viiSummary of Changes ixList of Chan
12、ges in Record Number Order x1 Scope . 12 General . 13 PressureTemperature Ratings 14 Size. 25 Marking . 26 Material . 27 Dimensions and Tolerances . 28 Threading . 99 Ribs 1010 Plugs, Bushings, and Locknuts . 1011 Face Bevel. 1012 Coatings 10Figures1 Identification of Reducing Fittings 22 Gaging of
13、Chamfered Internal Threads 10Tables1 PressureTemperature Ratings 22 Dimensions of Class 125, 90-deg and 45-deg Elbows, Tees, and Crosses(Straight Sizes) . 33 Dimensions of Class 125, 90-deg Elbows and Crosses (Reducing Sizes) . 44 Dimensions of Class 125 Tees (Reducing Sizes) 55 Dimensions of Class
14、125 Caps, Reducing Couplings, and Closed- and Open-PatternReturn Bends 86 Dimensions of Class 250, 90-deg and 45-deg Elbows, Tees, and Crosses(Straight Sizes) . 97 Inspection Tolerances . 10Mandatory AppendicesI Dimensions of Fittings in U.S. Customary Units . 11II References 19Nonmandatory Appendix
15、A Quality System Program 20iiiFOREWORDIn the spring of 1921, when the unification and extension of the flanged and threaded fittingsstandards in force in this country seemed desirable, the American Engineering StandardsCommittee subsequently the American Standards Association and currently the Ameri
16、canNational Standards Institute (ANSI) authorized the organization of a Sectional Committee onthe Standardization of Pipe Flanges and Flanged Fittings. The following organizations served asjoint sponsors: Heating, Piping, and Air Conditioning Contractors National Association (laterthe Mechanical Con
17、tractors Association of America), Manufacturers Standardization Society ofthe Valve and Fittings Industry, and the American Society of Mechanical Engineers.At the second meeting of the Sectional Committee held in New York on December 16, 1921,a report was submitted by the Subcommittee on Threaded Fi
18、ttings. It indicated clearly that goodprogress was already being made toward the development of an American Standard for cast ironthreaded fittings intended for services of 125-lb and 250-lb steam pressure. The review of theproposals of the manufacturers Committee of Five was assigned to the Subcomm
19、ittee on ThreadedFittings, and after a thorough study, it made its report to the Sectional Committee. The Standardwas finally completed, approved, and published in December 1927 with the designationASA B16d-1927.To bring this Standard in line with the best current practice, a revision was begun inSe
20、ptember 1936, providing for hydraulic service ratings, material specifications, tolerances onalignment, threading of fittings, and dimensions of some additional sizes, as well as dimensionaltables covering reducing couplings, caps, and closed- and open-pattern return bends. The revisionwas approved
21、in March 1941.The Standard was reviewed in 1947 and was approved by the Sectional Committee. Followingapproval of the sponsor bodies, the standard was presented for approval as an American Standard.It received that approval in December 1949, and was given the new designation ASA B16.4-1949.A review
22、was started in 1961 by Subcommittee No. 2. A draft involving only minor changeswas approved by the Sectional Committee and sponsor bodies. Final ASA approval was grantedon December 26, 1963.As the changes in organization occurred and standards designation increased, SubcommitteeNo. 2 began a review
23、in 1968. Minor changes included updating references and bringing theStandard into conformance with adopted policies of the B16 Committee. Final approval wasgranted by ANSI on January 20, 1971.In 1975, Subcommittee B (formerly 2), in its regular five-year review of the document, recom-mended the addi
24、tion of metric (SI) equivalents and updating of referenced standards. The revisededition received approval by ANSI on August 30, 1977.In 1982, American National Standards Committee B16 became the ASME B16 StandardsCommittee, operating with the same scope under ASME procedures accredited by ANSI. A n
25、ewrevision of the standard, including rationalization of metric equivalent dimensions and updatingof referenced standards, was approved and published as ANSI/ASME B16.4-1985.The 1992 edition of B16.4 omitted metric units, established U.S. customary units as the standard,and provided for electrodepos
26、ition as an alternative to hot dipping for zinc coating. Editorialrevisions were made to clarify and correct the text. Following approval by the StandardsCommittee and ASME, approval as an American National Standard was given onDecember 2, 1992, with the designation ASME B16.4-1992.In the 1998 editi
27、on of ASME B16.4, the list of referenced standards was updated, a QualitySystem Program Annex added, an issued Interpretation included, and several editorial revisionsmade. Following approval by ASME B16 Subcommittee B and B16 Standards Committee, ANSIapproved this American National Standard on Nove
28、mber 20, 1998.Work started during 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. Followingivapproval by the Standards Committee and the ASME Board, the revision to the 1998 edition of
29、this Standard was approved as an American National Standard by ANSI on November 9, 2006.In the 2011 edition, references to ASME standards were revised to no longer list specificedition years; the latest edition of ASME publications applies unless stated otherwise. Materialsmanufactured to other edit
30、ions of the referenced ASTM standards have been permitted to beused to manufacture fittings meeting the requirements of this Standard as long as the fittingmanufacturer verifies the material meets the requirements of the referenced edition. Followingapproval by the Standards Committee and the ASME B
31、oard on PTCS, the revision to the 2006edition was approved as an American National Standard by ANSI on August 9, 2011 with thenew designation, ASME B16.4-2011.In this 2016 edition, provisions have been made to revise the dimension and tolerance verbiage.Following approval by the ASME B16 Standards C
32、ommittee, ANSI approved this edition onSeptember 23, 2016, with the new designation ASME B16.4-2016.Requests for interpretation or suggestions for revision should be sent to the Secretary,B16 Standards Committee, The American Society of Mechanical Engineers, Two Park Avenue,New York, NY 10016-5990.v
33、ASME B16 COMMITTEEStandardization of Valves, Flanges, Fittings, and Gaskets(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. Ramcharran, SecretarySTANDARDS COMMITTEE PERSONNELA. Appleton,
34、Alloy Stainless Products Co., Inc.J. E. Barker, Dezurik Water ControlsR. W. Barnes, Anric Enterprises, Inc.P. Milankov, Alternate, Anric Enterprises, Inc.K. Barron, Ward ManufacturingD. C. Bayreuther, Metso Automation, Flow Control DivisionW. B. Bedesem, ConsultantR. M. Bojarczuk, ExxonMobil Researc
35、h and Engineering Co.A. M. Cheta, Qatar Shell GTLM. A. Clark, NIBCO, Inc.G. A. Cuccio, Capitol Manufacturing Co.J. DAvanzo, Fluoroseal ValvesC. E. Davila, Crane EnergyD. R. Frikken, Becht Engineering Co.R. B. Hai, RBH AssociatesSUBCOMMITTEE B THREADED FITTINGS (EXCEPT STEEL), FLANGES, AND FLANGED FI
36、TTINGSK. Barron, Chair, Ward ManufacturingG. T. Walden, Vice Chair, WolseleyE. Lawson, Secretary, The American Society of MechanicalEngineersW. Bliss, Tyler Pipe Co.M. A. Clark, NIBCO, Inc.viG. A. Jolly, ConsultantM. Katcher, Haynes InternationalT. A. McMahon, Emerson Process ManagementM. L. Nayyar,
37、 NICEW. H. Patrick, The Dow Chemical Co.D. Rahoi, ConsultantC. Ramcharran, The American Society of Mechanical EngineersR. A. Schmidt, CanadoilJ. Tucker, FlowserveF. R. Volgstadt, Volgstadt and Associates, Inc.F. Feng, Delegate, China Productivity Center for MachineryP. V. Craig, Contributing Member,
38、 Jomar GroupB. G. Fabian, Contributing Member, Pennsylvania Machine WorksA. G. Kireta, Jr., Contributing Member, Copper DevelopmentAssociation, Inc.D. F. Reid, Contributing Member, VSP TechnologiesJ. R. Holstrom, Val-Matic Valve and Manufacturing Corp.D. Hunt, Jr., FastenalW. H. LeVan, Cast Iron Soi
39、l Pipe InstituteJ. K. Schultz, Conine Manufacturing Co., Inc.G. L. Simmons, Charlotte Pipe and FoundryA. A. Knapp, Contributing Member, A. Knapp however, they should not contain proprietary names orinformation.viiRequests that are not in the format described above may be rewritten in the appropriate
40、 formatby the Committee prior to being answered, which may inadvertently change the intent of theoriginal request.ASME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninter
41、pretation 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 holds meetingsand/or telephone conferences that ar
42、e open to the public. Persons wishing to attend any meetingand/or telephone conference should contact the Secretary of the B16 Standards Committee.viiiASME B16.4-2016SUMMARY OF CHANGESFollowing approval by the ASME B16 Committee and ASME, and after public review,ASME B16.4-2016 was approved by the A
43、merican National Standards Institute onSeptember 23, 2016.ASME B16.4-2016 includes the following change identified by a margin note, (16). The RecordNumber listed below is explained in more detail in the “List of Changes in Record NumberOrder” following this Summary of Changes.Page Location Change (
44、Record Number)2 Section 7 Revised (12-580)ixLIST OF CHANGES IN RECORD NUMBER ORDERRecord Number Change12-580 Section 7, Dimensions and Tolerances, revisedxASME B16.4-2016GRAY IRON THREADED FITTINGSClasses 125 and 2501 SCOPEThis Standard for gray iron threaded fittings,Classes 125 and 250, covers(a)
45、pressuretemperature ratings(b) sizes and method of designating openings ofreducing fittings(c) marking(d) material(e) dimensions and tolerances(f) threading(g) coatingsMandatory Appendix I provides table values inU.S. Customary units.2 GENERAL2.1 ReferencesStandards and specifications adopted by ref
46、erence 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 referencedstandard and specification in the text, when referenced.Instead, the specific editions of the referenced standardsand specifica
47、tions are listed in Mandatory Appendix II.2.2 Quality SystemsRequirements relating to the product manufacturersquality system programs are described inNonmandatory Appendix A.2.3 Relevant UnitsThis Standard states values in both SI (Metric) andU.S. Customary units. These systems of units are to bere
48、garded separately as standard. Within the text, theU.S. Customary units are shown in parentheses or inseparate tables that appear in Mandatory Appendix I.The values stated in each system are not exact equiva-lents; therefore, it is required that each system of unitsbe used independently of the other
49、. Combining valuesfrom the two systems constitutes nonconformance withthe Standard.2.4 Service ConditionsCriteria for selection of materials suitable for particu-lar fluid service are not within the scope of this Standard.12.5 ConventionFor determining conformance with this Standard, theconvention for fixing significant digits where limits(maximum and minimum values) are specified shall beas defined in ASTM E29. This requires that an observedor calculated value be rounded off to the nearest unitin the last right-hand digit used for expressing the limit.Decimal values and tole
