1、AN AMERICAN NATIONAL STANDARD ASME B16.3-2016(Revision of ASME B16.3-2011)Malleable Iron Threaded FittingsClasses 150 and 300ASME B16.3-2016(Revision of ASME B16.3-2011)Malleable IronThreadedFittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuanc
2、e: November 30, 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. Casesand interpretati
3、ons 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 typographical or grammatical er
4、rorsin 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 option can be found on the ap
5、propriate 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 Stand
6、ards 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 opportunity for additional public inp
7、ut 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 connection with anyitems mention
8、ed 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 code or standard are expresslyadvised that determination of the validity of any such patent rights, and the
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10、tations 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 the prior written permission of
11、 the publisher.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 ixLi
12、st of Changes in Record Number Order x1 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 . 411 Face Bevel. 412 Coatings 4Figures1 Identification of Reducing Fittings 22 Gaging
13、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 Crosses (Reducing Sizes) 75 Dimensions of Class 150 Tees (Reduci
14、ng 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 Class 150 Caps 1210 Dimensions of Class 150 Closed-, Medium-, and O
15、pen-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 Class 300 Tees (Reducing Sizes) 1514 Dimensions of Class 300 Coupli
16、ngs . 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 Fittings in U.S. Customary Units . 21II References 38Nonmandatory A
17、ppendixA Quality System Program 39iiiFOREWORDIn 1921, the American Engineering Standards 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
18、 and FlangedFittings,withthefollowingorganizationsasjointsponsors:Heating,Piping,andAirConditioningContractors National Association later the Mechanical Contractors Association of America,(MCAA), Manufacturers Standardization Society of the Valves and Fittings Industry (MSS), andThe American Society
19、 of Mechanical Engineers (ASME).Threaded fittings were also included in the scope of the B16 Committee, and SubcommitteeNumber 2 (now Subcommittee B) was made responsible for threaded fittings other than steel.Thefirsteditionofastandardcovering150-lbmalleableironfittingswasapprovedasanAmericanTentat
20、iveStandardbyASAinDecember1927.In1936,arevisionwasundertakentoaddhydraulicservice 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 edi
21、tions, are now covered in a separatestandard, 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
22、as ASA B16.3-1951.Meanwhile, MSS, in cooperation 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 AS
23、A Sectional Committee B16 and assigned to 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. Subsequen
24、t reviews of thestandard, leading to revisions 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, respectively.In 1982,
25、American National Standards Committee B16 became the ASME 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
26、when zinc coating was required.The 1992 edition of B16.3 omitted metric units, establishing U.S. Customary units as thestandard.Clarificationsandeditorialrevisionsweremadetoimprovethetext.Followingapprovalby the Standards Committee and ASME, the 1992 edition received approval as an AmericanNational
27、Standard on December 2, 1992, with 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 appr
28、oved it as an American NationalStandard 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
29、 the inch units. Following approvalby the 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 the 2011 edition, references to ASME standards wer
30、e revised to no longer list specificedition years; the latest edition of ASME publications applies unless stated otherwise. Materialsmanufactured to other editions of the referenced ASTM standards have been permitted to beused to manufacture fittings meeting the requirements of this Standard as long
31、 as the fittingivmanufacturer verifies the material meets the requirements of the referenced edition. Followingapproval by the Standards Committee and the ASME Board on PTCS, the 2011 revision wasapprovedasanAmericanNationalStandardbyANSIonAugust9,2011withthenewdesignation,ASME B16.3-2011.In this 20
32、16 Edition, provisions have been made to update verbiage and readings. Followingtheapproval bytheASME B16StandardsCommittee,approval asanAmerican NationalStandardwas given by ANSI on September 26, 2016, with the new designation ASME B16.3-2016.vASME B16 COMMITTEEStandardization of Valves,Flanges, Fi
33、ttings, 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, Alloy Stainless Products Co., Inc.J. E. Barker, Dezurik
34、Water ControlsR. Barnes, Anric Enterprises, Inc.P. Milankov, Alternate, Anric Enterprises, Inc.K. Barron, Ward ManufacturingD. C. Bayreuther, Metso AutomationW. Bedesem, ConsultantR. Bojarczuk, ExxonMobil Research and Engineering Co.A. M. Cheta, Qatar Shell GTLM. Clark, NIBCO, Inc.G. A. Cuccio, Capi
35、tol 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 FITTINGSK. Barron, Chair, Ward ManufacturingG. T. Walden, Vice Chair, WolseleyE. Lawson, Secr
36、etary, The American Society of MechanicalEngineersW. Bliss, Tyler Pipe Co.M. Clark, NIBCO, Inc.viG. A. Jolly, ConsultantM. Katcher, Haynes InternationalT. A. McMahon, Emerson Process ManagementM. L. Nayyar, NICEW. H. Patrick, The Dow Chemical Co.D. Rahoi, CCM 2000C. Ramcharran, The American Society
37、of Mechanical EngineersR. A. Schmidt, CanadoilJ. Tucker, FlowserveF. R. Volgstadt, Volgstadt however, they should not contain proprietary names orinformation.viiRequests that are not in the format described above may be rewritten in the appropriate formatby the Committee prior to being answered, whi
38、ch 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 aninterpretation may appeal to the cognizant ASME Committee
39、 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 are open to the public. Persons wishing to attend any
40、meetingand/or telephone conference should contact the Secretary of the B16 Standards Committee.viiiASME B16.3-2016SUMMARY OF CHANGESFollowing approval by the ASME B16 Committee and ASME, and after public review,ASME B16.3-2016 was approved by the American National Standards Institute on September26,
41、 2016.ASME B16.3-2016 includes the following changes identified by a margin note, (16). The RecordNumbers listed below are explained in more detail in the “List of Changes in Record NumberOrder” following this Summary of Changes.Page Location Change (Record Number)2, 3 Section 7.2 Revised in its ent
42、irety (11-655)4 Section 12.1 Metric units added (11-1496)28 Table I-9 In NPS 2 line, value for MinimumOutside Diameter of Band revised(13-870)ixLIST OF CHANGES IN RECORD NUMBER ORDERRecord Number Change11-655 Section 7.2, Reduced Fittings: verbiage revised.11-1496 Section 12.1, Tolerance readings: m
43、etric conversions added.13-870 Mandatory Appendix I, Table I-9: for NPS 2, value for Minimum Outside Diameter of Bandrevised.xASME B16.3-2016MALLEABLE IRON THREADED FITTINGSClasses 150 and 3001 SCOPEThis Standard covers malleable iron threaded fittings,Classes 150 and 300. It also contains provision
44、s for usingsteel for caps and couplings in Class 150 for NPS38andsmaller. This Standard includes(a) pressuretemperature ratings(b) sizeandmethodofdesignatingopeningsofreduc-ing fittings(c) marking(d) material(e) dimensions and tolerances(f) threading(g) coatingsMandatory Appendix I provides table va
45、lues inU.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 standard and specification in the text.Instead, the specific editi
46、ons 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 Standard states values in both SI (Metric) andU.S. Customa
47、ry 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 exact equiva-lents; therefore, it is required that each syste
48、m 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-larfluidservicearenotwithinthescopeofthisStandard.12.5 ConventionFor determining conformance w
49、ith 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 tolerances do not imply a particularmethod of measurement.2.6 Denotation2.6.1 Pressure Rating Designation. Class, followedby a dimensionless number, is the designation forpressuretemperature ratings as follows: Class 150 andClass 300.2.6.2 Size. NPS, followed by a dime
