1、AN AMERICAN NATIONAL STANDARD ASME B16.9-2012(Revision of ASME B16.9-2007)Factory-Made Wrought Buttwelding FittingsASME B16.9-2012(Revision of ASME B16.9-2007)Factory-MadeWroughtButtweldingFittingsAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: February 28, 2013T
2、he next edition of this Standard is scheduled for publication in 2017.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 interpretations are published on
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5、age 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 Committee that a
6、pproved 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 industry, aca
7、demia,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 document,
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10、ent 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 publisher.The Am
11、erican Society of Mechanical EngineersTwo Park Avenue, New York, NY 10016-5990Copyright 2013 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B16 Committee viSummary of Changes vii1 Scope . 12 Pressure Ra
12、tings. 13 Size. 24 Marking . 25 Material . 26 Fitting Dimensions . 37 Surface Contours. 38 End Preparation 39 Design Proof Test 310 Production Tests . 511 Tolerances. 5Figure1 Maximum Envelope for Welding End Transitions 6Tables1 Dimensions of Long Radius Elbows . 72 Dimensions of Long Radius Reduci
13、ng Elbows . 83 Dimensions of Long Radius Returns 94 Dimensions of Short Radius Elbows . 105 Dimensions of Short Radius 180-deg Returns 106 Dimensions of 3D Elbows 117 Dimensions of Straight Tees and Crosses 118 Dimensions of Reducing Outlet Tees and Reducing Outlet Crosses . 129 Dimensions of Lap Jo
14、int Stub Ends . 1510 Dimensions of Caps 1611 Dimensions of Reducers 1712 Welding Bevels and Root Face 1913 Tolerances 20Mandatory AppendicesI Inch Tables . 23II References 37Nonmandatory AppendixA Quality System Program 38iiiFOREWORDIn 1921, the American Engineering Standards Committee, later the Am
15、erican StandardsAssociation (ASA), organized Sectional Committee B16 to unify and further develop nationalstandards for pipe flanges and fittings (and later, for valves, gaskets, and valve actuators). Cospon-sors of the B16 Committee were The American Society of Mechanical Engineers (ASME), theHeati
16、ng and Piping Contractors National Association now the Mechanical ContractorsAssociation of America (MCAA), and the Manufacturers Standardization Society of the Valveand Fittings Industry (MSS). Cosponsors were later designated as cosecretariat organizations.Standardization ofwelding fittings wasini
17、tiated in 1937 bya subgroup (designatedSubgroup 6)of Subcommittee 3. After consideration of several drafts, a standard was approved by theCommittee, cosponsors, and ASA, and published with the designation ASA B16.9-1940.Revisions were made in 1950 and 1955 to add sizes up to NPS 24 and to complete c
18、overageof fittings in some sizes. These revisions were approved and published as ASA B16.9-1951 andASA B16.9-1958. With the subgroup now designated Subcommittee 6 (later Subcommittee F),further revisions were begun to clarify the intent of the standard, to add angularity tolerances,and to include fi
19、ttings of different types (long radius reducing elbows and crosses) and smallersizes (NPS14and NPS12). This revision was published as ASA B16.9-1964 after ASA approval.After reorganization of ASA, first as the United States of America Standards Institute (USASI),then as the American National Standar
20、ds Institute (ANSI), with the Sectional Committee beingredesignated as an American National Standards Committee, another revision increasing the sizerange to NPS 48 and revising the text for clarity was approved and published as ANSI B16.9-1971.In 1975, Subcommittee F began a major revision to bring
21、 the standard up to date with currentpractice and usage. Common fractions were expressed as decimals (but without intending higherprecision) and metric dimensional equivalents were added. Provisions for step-wise change ofradius for NPS34long radius elbows and 180-deg returns were introduced. Follow
22、ing StandardsCommittee, cosecretariat, and ANSI approval, the revision was published as ANSI B16.9-1978.It was updated by a corrective addendum, B16.9a-1981, issued in February 1982.In 1982, American National Standards Committee B16 was reorganized as an ASME Committeeoperating under procedures accr
23、edited by ANSI. In ASME/ANSI B16.9-1986, the text was revisedand inch dimensions were established as the standard.In 1991, the Subcommittee reviewed the document and made a number of revisions that wereincluded in ASME B16.9-1993. Dimensions for short pattern lap joints were also added.In ASME B16.9
24、-2001, short radius elbows and returns were added, which included all dimen-sions and tolerances of ASME B16.28-1994. Metric units were provided as an independent butparallel alternative standard to U.S. Customary units, and a Quality System Program appendixwas added.In 2003, the Subcommittee review
25、ed the document and made a number of revisions. The scopeof the standard was changed to permit fabricated lap joint stub ends employing circumferentialor intersection welds.In 2006, the Subcommittee reviewed the document and made a number of additions andrevisions. Segmental elbow requirements were
26、added as were 3D elbow dimensions. Referencedocuments were updated.In 2012, the Subcommittee reviewed the document and made numerous revisions to the designproof test in section 9 and updated the references in Mandatory Appendix II.This Standard was approved as an American National Standard on Novem
27、ber 16, 2012.ivASME 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. Bedesem, ChairG. A. Jolly, Vice ChairC. E. OBrien, SecretarySTANDARDS COMMITTEE PERSONNE
28、LA. Appleton, Alloy Stainless Products Co., Inc.R. W. Barnes, Anric Enterprises, Inc.W. B. Bedesem, ConsultantR. M. Bojarczuk, ExxonMobil Research however, they shouldnot contain proprietary names or information.RequeststhatarenotinthisformatmayberewrittenintheappropriateformatbytheCommitteeprior to
29、 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 aggrieved by aninterpretation may appeal to the cog
30、nizant 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 thatare open to the public. Persons wishing to attend any meeting
31、should contact the Secretary ofthe B16 Standards Committee.viASME B16.9-2012SUMMARY OF CHANGESFollowing approval by the B16 Committee and ASME, and after public review, ASME B16.9-2012was approved by the American National Standards Institute on November 16, 2012.ASME B16.9-2012 consists of editorial
32、 changes, revisions, and corrections identified by a marginnote, (12), placed next to the affected area.Page Location Change3 9.1 First paragraph revised9.2.1 First sentence revised9.2.2 First paragraph revised4, 5 9.3 Revised9.4.3 Revised9.5 Added9.6 Added37 Mandatory Appendix II UpdatedviiINTENTIO
33、NALLY LEFT BLANKviiiASME B16.9-2012FACTORY-MADE WROUGHT BUTTWELDING FITTINGS1 SCOPE1.1 GeneralThis Standard covers overall dimensions, tolerances,ratings,testing,andmarkingsforfactory-madewroughtbuttwelding fittings in sizes NPS12through NPS 48(DN 15 through DN 1200).1.2 Special FittingsFittings may
34、 be made to special dimensions, sizes,shapes, and tolerances by agreement between the manu-facturer and the purchaser.1.3 Fabricated FittingsFabricated laterals and other fittings employing cir-cumferential or intersection welds are considered pipefabrication andare not withinthe scope ofthis Standa
35、rd.Fabricated lap joint stub ends are exempt from theabove restrictions, provided they meet all the require-ments of the applicable ASTM material specificationlisted in section 5.1.4 Relevant UnitsThis Standard states values in both SI (Metric) andU.S. Customary units. These systems of units are to
36、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 system of unitsbe used independently of the o
37、ther. Combining valuesfrom the two systems constitutes nonconformance withthe Standard.The designation for size is NPS for both metric- andcustomary-dimensioned fittings. Fitting pressure ratingis associated with the connecting wall thickness of pipeof equivalent size and material.1.5 References1.5.
38、1 Referenced Standards. Standards and specifi-cations adopted by reference in this Standard are shownin Mandatory Appendix II. It is not considered practicalto identify the specific edition of each standard andspecification in the individual references. Instead, thespecific edition reference is iden
39、tified in MandatoryAppendix II. A product made in conformance with aprior edition of referenced standards and in all other1respects conforming to this Standard will be consideredto be in conformance.1.5.2 Codes and Regulations. A fitting used underthe jurisdiction of the ASME Boiler and Pressure Ves
40、selCode, the ASME Code for Pressure Piping, or a govern-mentalregulationissubjecttoanylimitationofthatcodeor regulation. This includes any maximum temperaturelimitation or rule governing the use of a material at lowtemperature.1.6 Service ConditionsCriteria for selection of fitting types and materia
41、lssuitable for particular fluid service are not within thescope of this Standard.1.7 WeldingInstallation welding requirements are outside thescope of this Standard.1.8 Quality SystemsNonmandatory requirements relating to the fittingmanufacturers Quality System Program are describedin Nonmandatory Ap
42、pendix A.1.9 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 r
43、ight-hand digit used for expressing the limit.Decimal values and tolerances do not imply a particularmethod of measurement.1.10 Pressure Rating DesignationClass followed by a dimensionless number is thedesignationforpressuretemperatureratings.Standard-ized designationsfor flangesper ASMEB16.5 refere
44、ncedin this Standard are Classes 150, 300, 600, 900, 1500,and 2500.2 PRESSURE RATINGS2.1 Basis of RatingsThe allowable pressure ratings for fittingsdesignedinaccordance withthisStandardmay becalcu-lated as for straight seamless pipe of equivalent materialASME B16.9-2012(as shown by comparison of com
45、position and mechani-cal properties in the respective material specifications)inaccordancewiththerulesestablishedintheapplicablesections of ASME B31, Code for Pressure Piping. Forthe calculation, applicable data for the pipe size, wallthickness, and material that are equivalent to that ofthe fitting
46、 shall be used. Pipe size, wall thickness (orschedule number), and material identity on the fittingsare in lieu of pressure rating markings.2.2 Design of FittingsThe design of fittings shall be established by mathe-maticalanalyses(e.g.,ASMEB16.49forbends)containedin nationallyrecognized pressure ves
47、sel orpiping codes,orat themanufacturers optionby prooftestingin accor-dance with section 9 of this Standard. In order to meetdesign or manufacturing requirements, it is expectedthat some portion of formed fittings may have to bethicker than the pipe wall with which the fitting isintended to be used
48、. The mathematical analyses, if used,may take into account such thicker sections. Records ofmathematical analysis and/or successful proof test datashall be available at the manufacturers facility forinspection by the purchaser.3 SIZENPS, followed by a dimensionless number, is the des-ignation for no
49、minal fitting size. NPS is related to thereference nominal diameter, DN, used in internationalstandards. The relationship is, typically, as follows:DN NPS1512203425 132 11440 11250 265 21280 3100 4NOTE: For NPS 4, the equivalence is DN p 25 H11547 NPS.4 MARKING4.1 Standard MarkingEach fitting shall be permanently marked to show thefollowing:(a) manufacturers name or trademark(b) material identification, either the ASTM or ASMEgrade designation2(c) schedule number1or nominal wall thickness inmm(d) size the nominal pipe size (NPS) identificationnumber related to the en
