1、Malleable Iron Threaded FittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDASME B16.3-2011(Revision of ASME B16.3-2006)Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright ASME Internati
2、onal Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.3-2011(Revision of ASME B16.3-2006)Malleable IronThreadedFittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USACopyright
3、ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Date of Issuance: October 10, 2011The next edition of this Standard is scheduled for publication in 2016.ASME issues written replies to inquiries concerning i
4、nterpretations of technical aspects of thisStandard. Periodically certain actions of the ASME B16 Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued, and will be published within the n
5、ext edition of thestandard.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 Committee that approved the code or standard was balanced
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7、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 document, and does not undertake to insure anyone ut
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9、onsibility.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 this document issued in accordance with the establis
10、hedASME 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 publisher.The American Society of Mechanical EngineersThre
11、e Park Avenue, New York, NY 10016-5990Copyright 2011 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForew
12、ord ivCommittee Roster . viCorrespondence With the B16 Committee viiSummary of Changes viii1 Scope . 12 General . 13 PressureTemperature Ratings 14 Size. 25 Marking . 26 Material . 27 Dimensions and Tolerances . 28 Threading . 39 Ribs 310 Plugs, Bushings, and Locknuts . 311 Face Bevel. 312 Coatings
13、3Figures1 Identification of Reducing Fittings 22 Gaging of Chamfered Internal Threads 3Tables1 PressureTemperature Ratings 52 Inspection Tolerances . 53 Dimensions of Class 150, 90-deg Elbows, Tees, and Crosses, and 45-deg Elbows(Straight Sizes) . 64 Dimensions of Class 150, 90-deg Elbows and Crosse
14、s (Reducing Sizes) . 75 Dimensions of Class 150 Tees (Reducing Sizes) 86 Dimensions of Class 150, 45-deg Y-Branches (Straight Sizes) . 97 Dimensions of Class 150 Street Tees and 90-deg and 45-deg Street Elbows 108 Dimensions of Class 150 Couplings (Straight and Reducing Sizes) 119 Dimensions of Clas
15、s 150 Caps 1210 Dimensions of Class 150, Closed-, Medium-, and Open-Pattern Return Bends 1311 Dimensions of Class 300, 90-deg Elbows, Tees, and Crosses, and 45-deg Elbows(Straight Sizes) . 1412 Center-to-End Dimensions of Class 300, 90-deg Elbows (Reducing Sizes) . 1413 Center-to-End Dimensions of C
16、lass 300 Tees (Reducing Sizes) 1514 Dimensions of Class 300 Couplings . 1615 Dimensions of Class 300 Reducing Couplings . 1716 Dimensions of Class 300 Caps 1817 Dimensions of Class 300, 90-deg and 45-deg Street Elbows . 1918 Dimensions of Class 300 Return Bends 19Mandatory AppendicesI Dimensions of
17、Fittings in U.S. Customary Units . 21II References 38Nonmandatory AppendixA Quality System Program 39iiiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-FOREWORDIn 1921, the American Engineering St
18、andards Committee, later the American StandardsAssociation (ASA) and currently the American National Standards Institute (ANSI), authorizedthe organization of a Sectional Committee on the Standardization of Pipe Flanges and FlangedFittings, with the following organizations as joint sponsors: Heating
19、, Piping, and Air ConditioningContractors National Association (later the Mechanical Contractors Association of America,MCAA), Manufacturers Standardization Society of the Valves and Fittings Industry (MSS), andThe American Society of Mechanical Engineers (ASME).Threaded fittings were also included
20、in the scope of the B16 Committee, and SubcommitteeNumber 2 (now Subcommittee B) was made responsible for threaded fittings other than steel.The first edition of a standard covering malleable iron fittings, 150 lb, was approved as AmericanTentative Standard by ASA in December 1927. In 1936, a revisi
21、on was undertaken to add hydraulicservice ratings, material specifications, alignment tolerances, and dimensions for additional sizes.It was approved with the designation American Standard B16c-1939.Pipe plugs, bushings, and locknuts, included in the first editions, are now covered in a separatestan
22、dard, B16.14.A revision begun in 1947 amplified the sections on threading, inspection, and tolerances, andadded dimensions for additional sizes of elbows, reducing crosses, reducing tees, straight andreducing couplings, caps, and return bends. It was approved as ASA B16.3-1951.Meanwhile, MSS, in coo
23、peration with the Association of American Railroads (AAR), developedthe first standard for 300 lb malleable iron threaded fittings, published as MSS SP-31 of 1932.The 1950 edition of SP-31, which agreed with AAR Purchase Specification M-404, was submittedto ASA Sectional Committee B16 and assigned t
24、o Subcommittee Number 2. After balloting, itwas approved as a separate standard, ASA B16.19-1951.Work was begun to combine the two standards (for 150 lb and 300 lb) into a single documentin 1961. The resulting Standard was approved as ASA B16.3-1963. Subsequent reviews of theStandard, leading to rev
25、isions approved as ANSI B16.3-1971 and ANSI B16.3-1977, involvedupdating referenced standards and the introduction of metric (SI) dimensions and ratings. In the1977 edition, 150 lb and 300 lb were redesignated as Class 150 and Class 300.In 1982, American National Standards Committee B16 became the A
26、SME B16 StandardsCommittee, operating with the same scope under ASME procedures accredited by ANSI. Afurther revision of the standard, approved and published as ANSI/ASME B16.3-1985, providedfor electrodeposition as an alternative to hot dipping when zinc coating was required.The 1992 edition of B16
27、.3 omits metric units, establishing U.S. Customary units as the standard.Clarifications and editorial revisions were made in order to improve the text. Following approvalby the Standards Committee and ASME, the 1992 edition received approval as an AmericanNational Standard on December 2, 1992, with
28、the designation ASME B16.3-1992.In the 1998 edition of ASME B16.3, the References section was updated; a Quality SystemProgram Annex was added; and several editorial revisions were made. Following approval byASME B16 Subcommittee B and B16 Main Committee, ANSI approved this American NationalStandard
29、 on November 20, 1998.In the 2006 edition, metric dimensions became the primary units and inch dimensions wereincorporated into this Standard as secondary units and shown in parentheses. The added metricdimensions constitute an independent but equal standard to the inch units. Following approvalby t
30、he Standards Committee and the ASME Board, this revision to the 1998 edition of thisStandard was approved as an American National Standard by ANSI on November 9, 2006 withthe new designation, ASME B16.3-2006.In this edition, references to ASME standards were revised to no longer list specific editio
31、n years;the latest editionof ASME publications appliesunless stated otherwise. Materialsmanufactured toother editions of the referenced ASTM standards have been permitted to be used to manufacturefittings meeting the requirements of this Standard as long as the fitting manufacturer verifiesivCopyrig
32、ht ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-thematerial meetstherequirements ofthe referencededition.Following approvalbythe StandardsCommittee and the ASME Board on PTCS, this revision to the 2006 e
33、dition was approved as anAmerican National Standard by ANSI on August 9, 2011 with the new designation,ASME B16.3-2011.Requests for interpretation and suggestions for revision should be sent to The American SocietyofMechanicalEngineers,Secretary,B16Committee,ThreeParkAvenue,NewYork,NY10016-5990.vCop
34、yright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16 COMMITTEEStandardization of Valves, Flanges, Fittings, and Gaskets(The following is the roster of the Committee at the time of approval of thi
35、s Standard.)STANDARDS COMMITTEE OFFICERSW. B. Bedesem, ChairG. A. Jolly, Vice ChairD. R. Sharp, SecretarySTANDARDS COMMITTEE PERSONNELA. Appleton, Alloy Stainless Products Co., Inc.R. W. Barnes, Anric Enterprises, Inc.W. B. Bedesem, ConsultantR. M. Bojarczuk, ExxonMobil Research and Engineering Co.D
36、. F. Buccicone, Elkhart Products Corp.A. M. Cheta, Royal Dutch ShellM. A. Clark, Nibco, Inc.G. A. Cuccio, Capitol Manufacturing Co.C. E. Davila, Crane EnergyD. R. Frikken, Becht Engineering Co.R. P. Griffiths, U.S. Coast GuardSUBCOMMITTEE B THREADED FITTINGS (EXCEPT STEEL), FLANGES, AND FLANGED FITT
37、INGSK. 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 Corp.viG. A. Jolly, Vogt Valves/Flowse
38、rve Corp.M. Kachter, Haynes InternationalW. N. McLean, B however, they shouldnot contain proprietary names or information.Requests that 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.A
39、SME procedures provide for reconsideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or
40、 “endorse” any item, construction, proprietary device, or activity.Attending Committee Meetings. The B16 Standards Committee regularly holds meetings, whichare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.viiCopyright ASME Inter
41、national Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.3-2011SUMMARY OF CHANGESFollowing approval by the ASME B16 Committee and ASME, and after public review,ASME B16.3-2011 was approved by the American National St
42、andards Institute on August 9, 2011.ASME B16.3-2011 includes the following changes identified by a margin note, (11). In addition,in the main text, the “General” section was moved to section 2, and the subsequent sections andtheir paragraphs were renumbered accordingly.Page Location Change38 Mandato
43、ry Appendix II UpdatedviiiCopyright ASME International Provided by IHS under license with ASME Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ASME B16.3-2011MALLEABLE IRON THREADED FITTINGSClasses 150 and 3001 SCOPEThis Standard covers malleable iron threaded fitt
44、ings,Classes 150 and 300. It also contains provisions for usingsteel for caps and couplings in Class 150 for NPS38andsmaller. This Standard includes(a) pressuretemperature ratings(b) size and method of designating openings of reduc-ing fittings(c) marking(d) material(e) dimensions and tolerances(f)
45、threading(g) coatingsMandatory Appendix I provides table values in U.S.Customary units.2 GENERAL2.1 ReferencesStandards and specifications adopted by reference inthis Standard are shown in Mandatory Appendix II. Itis not considered practical to identify the specific editionof each referenced standar
46、d and specification in the text.Instead, the specific editions of the referenced standardsand specifications 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
47、 Standard states values in both SI (Metric) andU.S. Customary units. These systems of units are to beregarded 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 ex
48、act equiva-lents; therefore, it is required that each system of unitsbe used independently of the other. Combining valuesfrom the two systems constitutes nonconformance withthe Standard.2.4 Service ConditionsCriteria for selection of materials suitable for particu-lar fluidservice are notwithin the
49、scope ofthis 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 d
