1、Malleable Iron Threaded FittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDASME B16.3-2011(Revision of ASME B16.3-2006)ASME B16.3-2011(Revision of ASME B16.3-2006)Malleable IronThreadedFittingsClasses 150 and 300AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuan
2、ce: October 10, 2011The next edition of this Standard is scheduled for publication in 2016.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 interpretati
3、ons 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 next edition of thestandard.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under proced
4、ures 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 standard was madeavailable for
5、 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 position with respect
6、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 code or standard are expre
7、sslyadvised 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 asgovernment or industry endorse
8、ment 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 reproduced in any form,in an
9、 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.A.CONTENTSForeword ivCo
10、mmittee 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 3Figures
11、1 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 Crosses (Reduc
12、ing 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 Class 150 Ca
13、ps 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 Class 300
14、 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 Fittings
15、 in U.S. Customary Units . 21II References 38Nonmandatory AppendixA 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
16、 Sectional Committee on the Standardization of Pipe Flanges and FlangedFittings, with the following organizations as joint sponsors: Heating, Piping, and Air ConditioningContractors National Association (later the Mechanical Contractors Association of America,MCAA), Manufacturers Standardization Soc
17、iety of the Valves and Fittings Industry (MSS), andThe American Society 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.The first edition o
18、f a standard covering malleable iron fittings, 150 lb, was approved as AmericanTentative Standard by ASA in December 1927. In 1936, a revision was undertaken to add hydraulicservice ratings, material specifications, alignment tolerances, and dimensions for additional sizes.It was approved with the d
19、esignation American Standard B16c-1939.Pipe plugs, bushings, and locknuts, included in the first editions, 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, reduc
20、ing crosses, reducing tees, straight andreducing couplings, caps, and return bends. It was approved 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 19
21、32.The 1950 edition of SP-31, which agreed with AAR Purchase Specification M-404, was submittedto ASA 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
22、 lb) into a single documentin 1961. The resulting Standard was approved as ASA B16.3-1963. Subsequent 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 the
23、1977 edition, 150 lb and 300 lb were redesignated as Class 150 and Class 300.In 1982, 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
24、 ANSI/ASME B16.3-1985, providedfor electrodeposition as an alternative to hot dipping when zinc coating was required.The 1992 edition of B16.3 omits metric units, establishing U.S. Customary units as the standard.Clarifications and editorial revisions were made in order to improve the text. Followin
25、g approvalby the Standards Committee and ASME, the 1992 edition received approval as an AmericanNational 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 edit
26、orial revisions were made. Following approval byASME B16 Subcommittee B and B16 Main Committee, ANSI approved this 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
27、 and shown in parentheses. The added metricdimensions constitute an independent but equal standard to 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
28、, 2006 withthe new designation, ASME B16.3-2006.In this edition, references to ASME standards were revised to no longer list specific edition years;the latest editionof ASME publications appliesunless stated otherwise. Materialsmanufactured toother editions of the referenced ASTM standards have been
29、 permitted to be used to manufacturefittings meeting the requirements of this Standard as long as the fitting manufacturer verifiesivthematerial meetstherequirements ofthe referencededition.Following approvalbythe StandardsCommittee and the ASME Board on PTCS, this revision to the 2006 edition was a
30、pproved 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.vASME B16 COMMIT
31、TEEStandardization of Valves, Flanges, Fittings, and Gaskets(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSW. B. Bedesem, ChairG. A. Jolly, Vice ChairD. R. Sharp, SecretarySTANDARDS COMMITTEE PERSONNELA. Appleton, Alloy Stainless P
32、roducts Co., Inc.R. W. Barnes, Anric Enterprises, Inc.W. B. Bedesem, ConsultantR. M. Bojarczuk, ExxonMobil Research and Engineering Co.D. 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. F
33、rikken, Becht Engineering Co.R. P. Griffiths, U.S. Coast GuardSUBCOMMITTEE B THREADED FITTINGS (EXCEPT STEEL), FLANGES, AND FLANGED FITTINGSK. Barron, Vice Chair, Ward ManufacturingC. E. OBrien, Secretary, The American Society of MechanicalEngineersW. Bliss, Tyler Pipe Co.R. W. Bonds, Ductile Iron P
34、ipe Research AssociationM. A. Clark, Nibco, Inc.J. R. Holstrom, Val-Matic Valve and Manufacturing Corp.viG. A. Jolly, Vogt Valves/Flowserve Corp.M. Kachter, Haynes InternationalW. N. McLean, B however, they shouldnot contain proprietary names or information.Requests that are not in this format will
35、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 is available. Further, persons
36、 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 holds meetings, whichare open
37、 to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B16 Standards Committee.viiASME 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 Standards Institut
38、e 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 Mandatory Appendix II U
39、pdatedviiiASME B16.3-2011MALLEABLE IRON THREADED FITTINGSClasses 150 and 3001 SCOPEThis Standard covers malleable iron threaded fittings,Classes 150 and 300. It also contains provisions for usingsteel for caps and couplings in Class 150 for NPS38andsmaller. This Standard includes(a) pressuretemperat
40、ure ratings(b) size and method of designating openings of reduc-ing fittings(c) marking(d) material(e) dimensions and tolerances(f) threading(g) coatingsMandatory Appendix I provides table values in U.S.Customary units.2 GENERAL2.1 ReferencesStandards and specifications adopted by reference inthis S
41、tandard 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 editions of the referenced standardsand specifications are listed in Mandatory Appendix II.2.2 Quality SystemsRequ
42、irements 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 beregarded separately as standard. Within the text, theU.S. Customary
43、 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. Combining valuesfrom the two systems constitutes nonconformance
44、 withthe Standard.2.4 Service ConditionsCriteria for selection of materials suitable for particu-lar fluidservice are notwithin the scope ofthis Standard.12.5 ConventionFor determining conformance with this Standard, theconvention for fixing significant digits where limits(maximum and minimum values
45、) 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 Rat
46、ing 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 dimensionless num-ber, is the designation for nominal fitting size. NPS isrelated to the referenced nominal diameter, DN, use
47、din international standards. The relationship is, typically,as follows:NPS DN1481215125114321124025021265384 100GENERAL NOTE: For NPS 4, the related DNp25H11547NPS.3 PRESSURETEMPERATURE RATINGS(a) Pressuretemperature ratings for these fittings areshown in Tables 1 and I-1.(b) All ratings are indepen
48、dent of the contained fluidand are the maximum allowable working gage pressuresat the tabulated temperatures. Intermediate ratings maybe obtained by linear interpolation between the temper-atures shown.(c) The temperatures shown for the correspondingpressure rating shall be the material temperature
49、of thepressure-retaining structure. It may be assumed that theASME B16.3-2011material temperature is the same as the fluid tempera-ture. Use of a pressure rating at a material temperatureother than that of thecontained fluid is the responsibilityof the user and subject to the requirements of any appli-cable code.(d) Class 300 street elbows are not recommended forpressures above 600 psi.4 SIZE4.1 Nominal Pipe SizeAs applied in this Standard, the use of the phrase“nominal pipe size” or the designation NPS followedby a dimensionless number is for the purpose of identi-fyin
