1、Orifice FlangesAN AMERICAN NATIONAL STANDARDASME B16.36-2009(Revision of ASME B16.36-2006)ASME B16.36-2009(Revision of ASME B16.36-2006)Orifice FlangesAN AMERICAN NATIONAL STANDARDDate of Issuance: November 4, 2009The next edition of this Standard is scheduled for publication in 2014. There will be
2、no addendaissued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard. Interpretations and errata are published on the ASME Web site under the Committee Pagesat http:/cstools.asme.org as they are issued.ASME is the registered tradem
3、ark 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 to assure that individuals fromcompetent and concerned i
4、nterests 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, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” a
5、ny 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 utilizing a standard against liability forinfringement of
6、any applicable letters patent, nor assume any such liability. Users of a code or standard are expresslyadvised 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
7、(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 establishedASME procedures and policies, which precludes the issu
8、ance 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 EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2009 byTH
9、E AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B16 Committee vi1 Scope . 12 General . 13 PressureTemperature Ratings 14 Material . 15 Size. 26 Marking . 27 Flange Facing Finish . 28 Gaskets for Raised Face
10、Flanges 29 Pressure Taps 210 Jack Screw Provision . 211 Flange Dimensions. 312 Flange Threads 313 Tolerances. 3Figures1 Corner Taps 92 Angular Meter Tap for RTJ Flanges . 93 Jack Bolts 9Tables1 Class 300 Orifice Flanges, Welding Neck, Threaded, and Slip-On . 42 Class 600 Orifice Flanges, Welding Nec
11、k 53 Class 900 Orifice Flanges, Welding Neck 64 Class 1500 Orifice Flanges, Welding Neck . 75 Class 2500 Orifice Flanges, Welding Neck . 8Mandatory AppendicesI Dimensional Data for Classes 300, 600, 900, 1500, and 2500 Flanges inU.S. Customary Units 11II Dimensional Data for Class 400 Flanges in U.S
12、. Customary Units 17III References 19Nonmandatory AppendixA Quality System Program 20iiiFOREWORDAugust of 1956 marked the first recorded correspondence noting the lack of standardizationfor orifice flanges. There were, and still are, several codes for the performance and calibrationof orifice flange
13、s, but there had been no standardization of the flanges themselves. Over theensuing 3 years, correspondence continued among the Instrument Society of America, AmericanGas Association, and the B16 Standards Committee.On December 3, 1959, Subcommittee 3 (now Subcommittee C) of B16 authorized the appoi
14、nt-ment of a Task Force to undertake drafting of a standard. Although the initial work progressedsmoothly, a controversy developed over the standard size of taps to be specified for the flanges.This required many years to resolve. It was finally achieved in 1973 with the issuance of a draftfrom the
15、Task Force. Comments and objections to this draft from members of Subcommittee Cwere resolved, and a redraft was approved by the Subcommittee late in 1974. The B16 StandardsCommittee was balloted in the spring of 1975 and approval was gained. Comments from B16members from the gas industry requested
16、that the Class 400 orifice flange be included, and theB16 Subcommittee C agreed to consider this for a possible addendum. The Standard was approvedby ANSI on August 15, 1975.On April 30, 1979, an addenda was issued, which added Class 400 flanges andMandatory Appendix II covering reference documents
17、and organizations.In 1982, American National Standards Committee B16 was reorganized as an ASME Committeeoperating under procedures accredited by ANSI. In the 1988 edition, figures were added toillustrate jack bolts and corner taps, metric units have been omitted, and references to otherstandards ha
18、ve been updated. Following approval by the B16 Main Committee and the ASMESupervisory Board, the Standard was approved as an American National Standard by ANSI onFebruary 18, 1988.In 1996, several revisions were made, including the addition of angular meter taps for ringjoint flanges in sizes not pr
19、eviously covered. Following approval by the B16 Main Committeeand the ASME Supervisory Board, the Standard was approved as an American National Standardby ANSI on November 6, 1996.In 2006, several revisions were made, including the use of metric units as the primary referenceunits, while maintaining
20、 U.S. Customary units in either parenthetical or separate forms. Changesto dimensions and nomenclature followed that were contained within the 2003 edition ofASME B16.5. This includes the change of minimum flange thickness from C to tfand correctionsfor Y1and Y2. Class 400 remains in U.S. Customary
21、tables in Mandatory Appendix II, but is notgiven in the metric dimensional tables. There are numerous requirement clarifications and editorialrevisions. Following the approvals of the Standards Committee and ASME, approval for the newedition was granted by the American National Standards Institute o
22、n November 6, 2006.In the 2009 edition, Mandatory Appendix III was revised and updated. Also, section 4, thematerials section, has been revised to cover requirements of material specification editions otherthan those listed in Appendix III of ASME B16.5.Requests for interpretations or suggestions fo
23、r revisions should be sent to the Secretary,B16 Committee, Three Park Avenue, New York, NY 10016-5990. As an alternative, inquiries maybe submitted via e-mail to: SecretaryB16asme.org.This revision was approved by the American National Standards Institute on August 13, 2009.ivASME B16 COMMITTEEStand
24、ardization 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, ChairM. L. Nayyar, Vice ChairD. R. Sharp, SecretarySTANDARDS COMMITTEE PERSONNELR. W. Barnes, ANRIC Enterprises, Inc.W
25、. B. Bedesem, ExxonMobil Research however, theyshould not 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
26、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 “endorse” any item, co
27、nstruction, 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.viASME B16.36-2009ORIFICE FLANGES1 SCOPEThis S
28、tandard covers flanges (similar to those coveredin ASME B16.5) that have orifice pressure differentialconnections. Coverage is limited to the following:(a) welding neck flanges Classes 300, 600, 900, 1500,and 2500. U.S. Customary units are presented inMandatory Appendix I.(b) slip-on and threaded Cl
29、ass 300.(c) welding neck flanges Class 400 in U.S. Customaryunits in Mandatory Appendix II.2 GENERAL2.1 ReferencesCodes, standards, and specifications containing provi-sions to the extent referenced herein constitute require-ments of this Standard. These reference documents arelisted in Mandatory Ap
30、pendix III.2.2 Quality SystemsNonmandatory requirements relating to the productmanufacturers Quality System Program are describedin Nonmandatory Appendix A.2.3 Relevant UnitsThis Standard states values in both metric and U.S.Customary units. As an exception, diameter of bolts andflange bolt holes ar
31、e expressed in inch units only. Thesesystems of units are to be regarded separately as stan-dard. Within the text, the U.S. Customary units areshown in parentheses or in separate tables. The valuesstated in each system are not exact equivalents; there-fore, it is required that each system of units b
32、e usedindependently of the other. Except for diameter of boltsand flange bolt holes, combining values from the twosystems constitutes nonconformance with the standard.Except for Class 400, the values in U.S. Customary unitsare in Mandatory Appendix I. The main text of thisStandard does not contain r
33、equirements for Class 400welding neck flanges; however, Mandatory Appendix IIdoes contain requirements for this class, expressed inU.S. Customary units only.2.4 ConventionFor the purposes of determining conformance withthis Standard, the convention for fixing significant digitswhere limits and maxim
34、um and minimum values are1specified, shall be rounded as defined in ASTM PracticeE 29. This requires that an observed or calculated valueshall be rounded off to the nearest unit in the lastright-hand digit used for expressing the limit. Decimalvalues and tolerances do not imply a particular methodof
35、 measurement.2.5 Denotation2.5.1 Pressure Rating Designation(a) Class, followed by a dimensionless number, is thedesignation for pressuretemperature ratings as follows:Classes 300 600 900 1500 2500.(b) Class 400 is retained in the U.S. Customary tables.2.5.2 Sizes. NPS, followed by a dimensionlessnu
36、mber, is the designation for the nominal flange size.NPS is related to the reference nominal diameter, DN,used in international standards. The relationship is, typi-cally, as follows:NPS DN1251124025021265384 100GENERAL NOTE: For NPS 4, the related DNp25 (NPS).2.6 Service ConditionsCriteria for sele
37、ction of materials suitable for the par-ticular fluid service are not within the scope of thisStandard.3 PRESSURETEMPERATURE RATINGSThe pressuretemperature ratings, including all userecommendations and limitations, and the method ofrating given in ASME B16.5 apply to these flanges.4 MATERIAL4.1 Gene
38、ralFlange materials shall be in accordance with therequirements of ASME B16.5. For materials manufac-tured to editions of the material specification other thanthose listed in Appendix III of ASME B16.5, refer topara. 4.3.ASME B16.36-20094.2 BoltingBolting material recommendations are given inASME B1
39、6.5. For materials manufactured to editionsof the material specification other than those listed inAppendix III of ASME B16.5, refer to para. 4.3.4.3 Materials Manufactured to Other EditionsMaterials may meet the requirements of material spec-ification editions other than those listed in Appendix II
40、Iof ASME B16.5, provided(a) the materials are the same specification, e.g.,grade, type, class, or alloy, and heat-treated conditions,as applicable(b) the flange manufacturer certifies that the require-ments of the edition of the specification listed inAppendix III of ASME B16.5 have been met4.4 Plug
41、sPressure-retaining plugs shall conform toASME B16.11, unless otherwise agreed between pur-chaser and manufacturer. Plug material shall be at leastas corrosion resistant as the corresponding flangematerial.5 SIZEOrifice flange sizes are indicated by the nominal pipesize to which they are attached. O
42、nly those listed inTables 1 through 5, Tables I-1 through I-5, andMandatory Appendix II are considered standard.6 MARKINGFlanges shall be marked as required in ASME B16.5.For welding neck flanges only, the bore diameter shallbe marked.7 FLANGE FACING FINISHThe finish of contact faces shall conform t
43、o the require-ments of ASME B16.5.8 GASKETS FOR RAISED FACE FLANGES8.1 Gasket ThicknessFlange dimensions are based on the use of 1.5 mm(0.06 in.) thick gaskets.8.2 Flange Gaskets Requiring Dimensional ChangesWhen the location of the pressure tap with respect tothe orifice plate is critical to the se
44、rvice and meteringconditions, its location may be altered to accommodateother than 1.5 mm (0.06 in.) thick gaskets or ring-typejoint gaskets whose thickness may vary from that listedin Tables 2, 3, 4, and 5 or those listed in Tables I-2, I-3,I-4, and I-5 or Mandatory Appendix II.2The alteration of l
45、ocation may also be accomplishedby the removal of 2 mm (0.06 in.) from the raised faceof the flange. If an original 2 mm (0.06 in.) high raisedface is removed, the user is cautioned to limit the outsidediameter of the gasket or orifice plate to the tabulatedR dimension.9 PRESSURE TAPS9.1 GeneralEach
46、 orifice flange shall be provided with two pres-sure tap holes extending radially from the outside diam-eter of the flange to the inside diameter of the flange.Corner taps may be used on NPS 112and smaller ifspace permits. See Fig. 1.For ring joint flanges listed in Tables 2 through 5,Tables I-1 thr
47、ough I-5, and Mandatory Appendix II,where radial taps will interfere with the ring groove,angular meter taps, as illustrated in Fig. 2, will berequired. Each pressure tap hole shall be equipped witha pipe plug.9.2 Location9.2.1 Measurement. The 24 mm (0.94 in.) dimensionfor raised face and 19 mm (0.
48、75 in.) for ring joint shallbe measured at the bore.9.2.2 Identification. For ring joint flanges requiringalteration of pressure tap location due to interferencewith the ring groove other than methods provided inthis Standard, such alteration shall be identified peragreement between purchaser and ma
49、nufacturer.9.3 Pipe ConnectionUnless otherwise specified, pressure tap holes may beeither tapped12NPT in accordance with ASME B1.20.1or12NPS socket connection in accordance withASME B16.11.10 JACK SCREW PROVISION10.1 LocationEach flange shall have a machine bolt mounted in ahole drilled on the flange bolt circle centerline at 90 degfrom the pressure taps, for use as a jack screw. Themachine bolt shall be regular with one heavy hex nut.See Fig. 3.10.2 Slot for NutA slot shall be provided in the flange 2 mm (0.06 in.)wider than the width across flats of the nut. The depth ofthe s
