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(Revision of ASME B16.36-2006)^ ASME B16.36-
Copyright ASME InternationalProvided by IHS under license with ASMENo reproduction or networking permitted without license from IHS Not for Resale //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\ --,,```,,,,````--,,,,,,,`---
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Foreword............................................................................. .Committee RosterCorrespondence With the B16 Committee 12345678910111213 ScopeGeneralPressure–Temperature RatingsMaterialSizeMarkingFlange Facing FinishGaskets for Raised Face FlangesPressure TapsJack Screw ProvisionFlange DimensionsFlange ThreadsTolerances...................................................................................................................................................................................................................................... ........................................................................... ........................................................................... .......................................................................... (^)..................................................................... ......................................................................................................................................................................................................................................................................... .......................................................................................................................................................................... CONTENTS.............................................. ivviv (^1111222222333)
,,```,,,,````--,,,,,,,`--- Not for Resale//^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\iiifor orifice flanges. There were, and still are, several codes for the performance and calibrationof orifice flanges, 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.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 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 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.Mandatory Appendix II covering reference documents and organizations.operating 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 have 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.^ August of 1956 marked the first recorded correspondence noting the lack of standardizationOn December 3, 1959, Subcommittee 3 (now Subcommittee C) of B16 authorized the appoint-On April 30, 1979, an addenda was issued, which added Class 400 flanges andIn 1982, American National Standards Committee B16 was reorganized as an ASME CommitteeIn 1996, several revisions were made, including the addition of angular meter taps for ring FOREWORD
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consensus of concerned interests. As such, users of this Standard may interact with the Committeeby requesting interpretations, proposing revisions, and attending Committee meetings. Corre-spondence should be addressed to:that appear necessary or desirable, as demonstrated by the experience gained from the applicationof the Standard. Approved revisions will be published periodically.as specific as possible, citing the paragraph number(s), the proposed wording, and a detaileddescription of the reasons for the proposal, including any pertinent documentation.ment of the Standard. Interpretations can only be rendered in response to a written request sentto the Secretary of the B16 Standards Committee.that the inquirer submit his/her request in the following format:Subject:Edition: General. As an alternative, inquiries may be submitted via e-mail to: [email protected]. Proposing Revisions. The Committee welcomes proposals for revisions to this Standard. Such proposals should be Interpretations. The request for interpretation should be clear and unambiguous. It is further recommended CORRESPONDENCE WITH THE B16 COMMITTEE^ ASME Standards are developed and maintained with the intent to represent the Upon request, the B16 Committee will render an interpretation of any require-Cite the applicable paragraph number(s) and the topic of the inquiry.Cite the applicable edition of the Standard for which the interpretation is Revisions are made periodically to the Standard to incorporate changesSecretary, B16 Standards CommitteeThe American Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-
,,```,,,,````--,,,,,,,`--- viNot for Resale //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\(^1) in ASME B16.5) that have orifice pressure differentialconnections. Coverage is limited to the following:and 2500. U.S. Customary units are presented inMandatory Appendix I.units in Mandatory Appendix II. (^2) 2.1 References (^) This Standard covers flanges (similar to those covered (a) (b) (c) Codes, standards, and specifications containing provi- SCOPEGENERAL welding neck flanges Classes 300, 600, 900, 1500,welding neck flanges Class 400 in U.S. Customaryslip-on and threaded Class 300.^ ORIFICE FLANGES ASME B16.36- sions to the extent referenced herein constitute require-ments of this Standard. These reference documents arelisted in Mandatory Appendix III. 2.2 Quality Systems manufacturer’s Quality System Program are describedin Nonmandatory Appendix A. 2.3 Relevant Units Customary units. As an exception, diameter of bolts andflange bolt holes are 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 be 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 requirements for Class 400welding neck flanges; however, Mandatory Appendix IIdoes contain requirements for this class, expressed inU.S. Customary units only. Nonmandatory requirements relating to the product This Standard states values in both metric and U.S. 2.4 Convention this Standard, the convention for fixing significant digitswhere limits and maximum and minimum values are For the purposes of determining conformance with 1
specified, 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 measurement. 2.5 Denotation designation for pressure–temperature ratings as follows:Classes 300 600 900 1500 2500.number, 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: GENERAL NOTE: (a) (b) 2.5.1 Pressure Rating Designation 2.5.2 Sizes. Class, followed by a dimensionless number, is theClass 400 is retained in the U.S. Customary tables. For NPS (^) NPS 12 NPS, followed by a dimensionless (^1234 11) ⁄ (^) ⁄ (^22) ≥ 4, the related DNDN (^1002540506580) p 25 (NPS). //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\Copyright ASME InternationalProvided by IHS under license with ASMENo reproduction or networking permitted without license from IHS--,,```,,,,````--,,,,,,,`--- Not for Resale 2.6 Service Conditions ticular fluid service are not within the scope of thisStandard. (^3) recommendations and limitations, and the method ofrating given in ASME B16.5 apply to these flanges. (^4) 4.1 General requirements 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. Criteria for selection of materials suitable for the par- The pressure–temperature ratings, including all use Flange materials shall be in accordance with the PRESSURE–TEMPERATURE RATINGSMATERIAL
10.3 Tapped Hole be provided and the hex nut omitted when agreed onbetween the purchaser and the manufacturer. (^11) metric, and Tables I-1, I-2, I-3, I-4, and I-5, andMandatory Appendix II for U.S. Customary. (^12) StandardASME B1.20.1.flange. Variations in alignment shall not exceed 5 mm/m(0.06 in./ft).back of the flange and the threads shall be chamferedto the diameter of the counterbore at an angle of approxi-mately 45 deg with the axis of the thread to afford easyentrance in making a joint. The counterbore and chamfer As an alternative to para. 10.2, a tapped hole may Dimensions are listed in Tables 1, 2, 3, 4, and 5 for Threaded flanges shall have an American National (a) (b) (^) FLANGE DIMENSIONSFLANGE THREADS The thread shall be concentric with the axis of theThe flanges are made with counterbores at the taper pipe thread conformingASME B16.36-2009 to
diameters through to the face of the flange, or shall havea counterbore at the face of the flange.flush with the bottom of the chamfer in all threadedflanges and shall be considered as being the intersectionof the chamfer cone and the pitch cone of the thread.This depth of chamfer is approximately equal to one-halfthe pitch of the thread.turn large or small from the gaging notch. (^13) ASME B16.5 except for those shown below. 13.1 Pressure Tap Location from flange face shall be 13.2 Bore Diameter is ±0.5% of nominal value. 1 (d) (e) Tolerances on all dimensions shall be as shown in Tolerance on location of center of pressure tap hole (a) (b) Bore diameter tolerance (welding neck flanges only)See para. 9.2. (^) TOLERANCES The maximum allowable thread variation is one±0.5 mm (±0.02 in.) for flanges smaller than NPS 4±0.8 mm (±0.03 in.) for flanges NPS 4 and largerThe gaging notch of the working gage shall come 1 //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\Copyright ASME InternationalProvided by IHS under license with ASMENo reproduction or networking permitted without license from IHS--,,```,,,,````--,,,,,,,`--- Not for Resale
Table 1^ Class 300 Orifice Flanges, Welding Neck, Threaded, and Slip-On X A B 1^ X^ TT^ drill [Note (2)]^1 TT drill must be/^ NPT^1 Q^2 /^ NPT B^2 free from burrs[Note (1)][Note (1)] t (^) Yf 1^ Y^2 Q^ F 24 RGR^ 2 OO Weld Neck^ Threaded^
Outside^ HubLength Through Hub^ Diameter of^ Counterbore
Bore^ Drilling Template^ Bolt Length Nom-^ Diameter^ Outside^ Minimum^ Diameter^
Diameter ofCounterbore Depth [(3), (4)] inal^ of Raised^ Diameter^ Thickness^ Slip-On and^ Weld^ Diameter^ Beginning^
Weld^ Pressure^ Number^ Diameter^ Diameter(From Face) Pipe^ Face,^ of Flange,^ of^ Threaded,^ Neck,^ of Hub,^ of Chamfer^ Back,^ Face,
Slip-On,^ Neck,^ Connection,^ Bolt^ of^ of^ of^ Machine^ Stud Size^ R^ O^ Flange,^ tYYX^ (W.N.),^ A^ Q^ Qf^^2 1 B^
F^ G^ BBTT^ Circle^ Holes^ Holes^ Bolts^ Bolts^ F^2 Bolts 1 50.8^125 36.6^46 81 54 33.4^ 35.8^ 33.
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Table 3^ Class 900 Orifice Flanges, Welding Neck TT drill must be A free from burrs B Y tf Special One- or^247 Two-Piece Ring andOrifice Plate Assembly Raised Face Ring-Type Joint
Ring-Type Joint^ Drilling Template
Length of Outside^ Minimum^
Hub^ eter of^ Stud Bolts Diameter^ Outside^ Thick-^ Length^ Radius^ Special
Diam-^ Diameter^ Pressure^ Diam-^ [(2), (3)] Nominal^ of Raised^ Diameter^ ness of^ Through^ Groove^ Pitch^ Groove^ Groove^ at^
Oval Ring^ eter of^ Beginning^ Connec-^ eter of^ Num-^ Diam-^ Diam- Pipe^ Face,^ of Flange,^ Flange,^ Hub,^ Num-^ Diameter,^ Depth,^ Width,^ Bottom,
Height,^ Hub,^ of Chamfer,^ Bore,^ tion,^ Bolt^ ber of^ eter of^ eter of^ Raised^
Ring Size^ R^ O^ t^ Y^ ber^ P^ E^ F^ r^ f^
W^ X^ A^ B^ TT^ Circle^ Holes^ Holes^ Bolts^ Face^ Joint 111 ⁄^12 For NPS 2⁄and smaller, use Class 1500.^2 2 12 ⁄^23 127.0^240 38.1^102 R31^ 123.83^ 7.92^ 11.91^ 0.^
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Table 4^ Class 1500 Orifice Flanges, Welding Neck ATT drill must befree from burrs B Y tf Special One- or^247 Two-Piece Ring andOrifice Plate Assembly Raised Face Ring-Type Joint
Ring-Type Joint^ Drilling Template
Length of Outside^ Minimum^
Hub^ eter of^ Stud Bolts Diameter^ Outside^ Thick-^ Length^ Radius^ Special
Diam-^ Diameter^ Pressure^ Diam-^ [(2), (3)] Nominal^ of Raised^ Diameter^ ness of^ Through^ Groove^ Pitch^ Groove^ Groove^ at^
Oval Ring^ eter of^ Beginning^ Connec-^ eter of^ Num-^ Diam-^ Diam- Pipe^ Face,^ of Flange,^ Flange,^ Hub,^ Num-^ Diameter,^ Depth,^ Width,^ Bottom,
Height,^ Hub,^ of Chamfer,^ Bore,^ tion,^ Bolt^ ber of^ eter of^ eter of^ Raised^
Ring Size^ R^ O^ t^ Y^ ber^ P^ E^ F^ r^ f^
W^ X^ A^ B^ TT^ Circle^ Holes^ Holes^ Bolts^ Face^ Joint 1 50.8^150 38.1^83 R16^ 50.80^ 6.35^ 8.74^ 0.^
,,```,,,,````--,,,,,,,`--- Not for Resale^7 //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\GENERAL NOTES:(a)^ Dimensions are in millimeters, except for bolts and bolt holes.(b) All other dimensions are in accordance with ASME B16.5.(c)^ Ring joint flanges larger than NPS 6 will require angular meter taps shown in Fig. 2.NOTES:(1) Other NPT sizes may be furnished if required.(2) In conformance with ASME B16.5, stud bolt lengths do not include point heights.(3) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12 and 10 mm (0.38 in.) for NPS 14 to NPS 24. Boltlengths for ring-type joint flanges include allowance of 15 mm (0.62 in.) for NPS 1 to NPS 6.(4) Bore is to be specified by the purchaser.Fig. 2 Angular Meter Tap for RTJ Flanges^ Fig. 1 ASME B16.36-2009^ Corner Taps 19 mm( (^3) / 4 in.) Flange bore Nut slotJack bolt Fig. 3 Jack Bolts Ring groove5 mm( (^3) / 16 in.) min.Plug Flange O.D.
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,,```,,,,````--,,,,,,,`---^10 Not for Resale //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\Table I-1^ Class 300 Orifice Flanges, Welding Neck, Threaded, and Slip-On X A B 1^ X^1 TT drill must be^ TT^ drill [Note (2)]/^ NPT Q^12 B /^ NPT^2 free from burrs[Note (1)][Note (1)] t fY 1^ Y^2 Q^ F 0.94 GRR^ 0.06 OO Weld Neck^ Threaded^
Outside^ HubLength Through Hub^ Diameter of^ Counterbore
Bore^ Drilling Template^ Bolt Length Nom-^ Diameter^ Outside^ Minimum^ Diameter^
Diameter ofCounterbore Depth [(3), (4)] inal^ of Raised^ Diameter^ Thickness^ Slip-On and^ Weld^ Diameter^ Beginning^
Weld^ Pressure^ Number^ Diameter^ Diameter(From Face) Pipe^ Face,^ of Flange,^ of^ Threaded,^ Neck,^ of Hub,^ of Chamfer^ Back,^ Face,
Slip-On,^ Neck,^ Connection,^ Bolt^ of^ of^ of^ Machine^ Stud Size^ R^ O^ Flange,^ tYYX^ (W.N.),^ A^ QQf^^2 1 B^
F^ G^ BBTT^ Circle^ Holes^ Holes^ Bolts^ Bolts^ F^2 Bolts 1 2.00^ 4.88^ 1.44^ 1.81^ 3.19^ 2.12^ 1.32^ 1.41^ 1.
,,```,,,,````--,,,,,,,`---^12 Not for Resale GENERAL NOTES:(a)^ Dimensions are in inches.(b) Weld neck flanges NPS 3 and smaller are dimensionally identical to Class 600 flanges and may be so marked.(c)^ All other dimensions are in accordance with ASME B16.5.NOTES:(1) Other NPT sizes may be furnished if required.(2) For slip-on and threaded flanges, verify that^ TT^ drilling extends to inside diameter of pipe after assembly and is free from burrs.(3) Bolt lengths include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24.(4) In conformance with ASME B16.5, stud bolt lengths do not include point heights.(5) Bore diameter of weld neck flanges is to be specified by the purchaser.(6) Threaded flanges are furnished in NPS 1 to NPS 8 only.//^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\
Table I-2^ Class 600 Orifice Flanges, Welding Neck TT drill must be A free from burrs B Y Special One- or tf Two-Piece Ring and H^ 0.94 Orifice Plate Assembly Raised Face Ring-Type Joint
Outside^
Diam-^ Drilling TemplateRing-Type Joint Length of Diameter^ Height^
Diam-^ Hub^ eter of^ Diameter of^ Stud Bolts of^ Outside^ Minimum^ Length^ of^ Special
eter^ Diameter^ Pressure^ Num-^ Diam-Holes^ [(2), (3)] Nominal^ Raised^ Diameter^ Thick-^ Through^ Raised^ Groove^ Pitch^ Groove^ Groove^ Radius at
Oval Ring^ of^ Beginning^ Connec-^ ber^ eter Pipe^ Face,^ of Flange,^ ness of^ Hub,^ Face,^ Num-^ Diameter,^ Depth,^ Width,^ Bottom,
Height,^ Hub,^ of Chamfer,^ Bore,^ tion,^ Bolt^ of^ Raised^ Ring^ of^ Raised^ Ring Size^ R^ O^ Flange,^ tY^ H^ ber^ P^ E^ F^ r^ f^
W^ X^ A^ B^ TT^ Circle^ Holes^ Face^ Joint^ Bolts^ Face^ Joint 1 2.00^ 4.88^ 1.44^ 3.19^ 0.06^ R16^ 2.000^ 0.250^ 0.344^ 0.^
,,```,,,,````--,,,,,,,`--- Not for Resale^13 //^:^^#^~^^""~:@":^^~$~"#:~^#:^:$"$#~~"^~:^:@:~*:$"\GENERAL NOTES:(a)^ Dimensions are in inches.(b) Weldneck flanges NPS 3 and smaller are identical to Class 300 flanges except for bolting and may be used for such service.(c)^ All other dimensions are in accordance with ASME B16.5.(d) Ring joint flange in NPS 24 will require an angular meter tap as shown in Fig. 2.NOTES:(1) Other NPT sizes may be furnished if required.(2) Bolt lengths for raised face flanges include allowance for orifice and gasket thickness of 0.25 in. for NPS 1 to NPS 12 and 0.38 in. for NPS 14 to NPS 24. Bolt lengths for ring-typejoint flanges include allowance of 0.62 in. for NPS 1 to NPS 10, 0.75 in. for NPS 12 to NPS 18, and 0.88 in. for NPS 20.(3) In conformance with ASME B16.5, stud bolt lengths do not include point heights.(4) Bore is to be specified by the purchaser.