1、Gray Iron Threaded FittingsClasses 125 and 250AN AMERICAN NATIONAL STANDARDASME B16.4-2011(Revision of ASME B16.4-2006)ASME B16.4-2011(Revision of ASME B16.4-2006)Gray IronThreadedFittingsClasses 125 and 250AN AMERICAN NATIONAL STANDARDThree Park Avenue New York, NY 10016 USADate of Issuance: Septem
2、ber 15, 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 interpretations are
3、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 procedures acc
4、redited 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 public
5、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 to the v
6、alidity 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 expresslyadvi
7、sed 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 endorsement of
8、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 electro
9、nic 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 ivCommittee
10、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 . 29 Ribs 310 Plugs, Bushings, and Locknuts . 311 Face Bevel. 312 Coatings 3Figures1 Identi
11、fication of Reducing Fittings 22 Gaging of Chamfered Internal Threads 3Tables1 PressureTemperature Ratings 22 Dimensions of Class 125, 90-deg and 45-deg Elbows, Tees, and Crosses(Straight Sizes) . 43 Dimensions of Class 125, 90-deg Elbows and Crosses (Reducing Sizes) . 54 Dimensions of Class 125 Tee
12、s (Reducing Sizes) 65 Dimensions of Class 125 Caps, Reducing Couplings, and Closed- and Open-PatternReturn Bends 96 Dimensions of Class 250, 90-deg and 45-deg Elbows, Tees, and Crosses(Straight Sizes) . 107 Inspection Tolerances . 10Mandatory AppendicesI Dimensions of Fittings in U.S. Customary Unit
13、s . 11II References 19Nonmandatory AppendixA 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 St
14、andards Association and currently the AmericanNational 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 Na
15、tional Association (laterthe Mechanical Contractors 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 s
16、ubmitted by the Subcommittee on Threaded Fittings. 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 and 250 lb steam pressure. The review of theproposalsofthemanufacturersCommittee
17、ofFivewasassignedtotheSubcommitteeonThreadedFittings, 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 practic
18、e, a revision was begun in September,1936, providing for hydraulic service ratings, material specifications, tolerances on alignment,threading of fittings, and dimensions of some additional sizes, as well as dimensional tablescovering reducing couplings, caps, and closed- and open-pattern return ben
19、ds. The revision wasapproved 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 desig
20、nation ASA B16.4-1949.A review 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, Su
21、bcommitteeNo. 2 began a review in 1968. Minor changes included updating references and bringing theStandard into conformance with adopted policies of the B16 Committee. Final approval wasgranted by the American National Standards Institute on January 20, 1971.In 1975, Subcommittee B (formerly 2), in
22、 its regular five-year review of the document, recom-mended the addition 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, operati
23、ng with the same scope under ASME procedures accredited by ANSI. A newrevision 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, establishe
24、d U.S. customary units as the standard,and provided for electrodeposition 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 onDece
25、mber 2, 1992, with the designation ASME B16.4-1992.In the 1998 edition 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 Stand
26、ards Committee, ANSIapproved this American National Standard on November 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 Standar
27、ds Committee and the ASME Board, this revision to the 1998 edition ofthis Standard was approved as an American National Standard by ANSI on November 9, 2006.Inthis edition,references toASMEStandards wererevised tonolonger listspecific editionyears;the latest edition ofASME publications applies unles
28、s stated otherwise.Materials manufactured 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 verifiesthematerial meetsthe requirementsof thereferenced edition.Following
29、approvalby theStandardsCommittee and the ASME Board on PTCS, this revision to the 2006 edition was approved as anAmerican National Standard by ANSI on August 9, 2011 with the new designation,ASME B16.4-2011.Requests for interpretation and suggestions for revision should be sent to the Secretary,B16
30、Committee, The American Society of Mechanical Engineers, Three Park Avenue, New York,NY 10016-5990.vASME 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 OFFICERSW. B. Bed
31、esem, 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. F. Buccicone, Elkhart Products Corp.A. M. Cheta
32、, 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 FITTINGSK. Barron, Vice Chair, Ward ManufacturingC. E
33、. 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/Flowserve Corp.M. Katcher, Haynes InternationalW. N. Mc
34、Lean, 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.ASME procedures provide for reconsideration of any
35、 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 “endorse” any item, construction, proprietary de
36、vice, 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.viiASME B16.4-2011SUMMARY OF CHANGESFollowing approval by the ASME B16 C
37、ommittee and ASME, and after public review,ASME B16.4-2011 was approved by the American National Standards Institute on August 9, 2011.ASME B16.4-2011 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
38、 subsequent sections andtheir paragraphs were renumbered accordingly.Page Location Change19 Mandatory Appendix II UpdatedviiiASME B16.4-2011GRAY IRON THREADED FITTINGSCLASSES 125 AND 2501 SCOPEThis Standard for gray iron threaded fittings,Classes 125 and 250, covers(a) pressuretemperature ratings(b)
39、 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 reference inthis Standard are sho
40、wn 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 specifications are listed in Mandatory
41、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 beregarded separately as standard.
42、 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. Combining valuesfrom the two
43、 systems constitutes nonconformance 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 wher
44、e 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 measureme
45、nt.2.6 Denotation2.6.1 Pressure Rating Designation. Class, followedby a dimensionless number, is the designation forpressuretemperature ratings as follows: Class 125 andClass 250.2.6.2 Size. NPS, followed by a dimensionless num-ber, is the designation for nominal fitting size. NPS isrelated to the r
46、eference nominal diameter, DN, used ininternational standards. The relationship is, typically, asfollows:NPS DN12511432112402502126538312.4 100GENERAL NOTE: For NPS 4, the related DNp25H11547NPS.3 PRESSURETEMPERATURE RATINGS(a) Pressuretemperature ratings for these fittings areshown in Tables 1 and
47、I-1.(b) All ratings are independent 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 sha
48、ll be the material temperature of thepressure-retaining structure. It may be assumed that thematerial temperature is the same as the fluid tempera-ture. Use of a pressure rating at a material temperatureASME B16.4-2011Table 1 PressureTemperature RatingsWorking Pressure, barTemperature, C Class 125 C
49、lass 25029 to 66 12.1 27.6100 11.1 25.0125 10.2 23.1150 9.8 21.2175 8.7 Note (1) 19.4200 . . . 17.5 Note (2)NOTES:(1) Permissible for service temperature up to 178C, reflecting thetemperature of saturated steam at 8.6 bar.(2) Permissible for service temperature up to 208C, reflecting thetemperature of saturated steam at 17.2 bar.other than that of thecontained fluid is the responsibilityof the user and subject to the requirements of any appli-cable code.4 SIZE4.1 Nominal Pipe SizeAs applied in this Standard, the use of the phrase“nominal pipe size” or the des
