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ASME B16.5-2020
M00050635
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ASME B16.5-2020 Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24, Metric/Inch Standard
standard by ASME International, 01/29/2021
Full Description
ASME has been defining piping safety since 1922.ASME B16.5 Pipe Flanges and Flanged Fittings: NPS through NPS 24 Metric/Inch Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are:
(1) flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS through NPS 24 and flanges with rating class designation 2500 in sizes NPS through NPS 12, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units;
(2) flanged fittings with rating class designation 150 and 300 in sizes NPS through NPS 24, with requirements given in both metric and U.S. Customary units with diameter of bolts and flange bolt holes expressed in inch units;
(3) flanged fittings with rating class designation 400, 600, 900, and 1500 in sizes NPS through NPS 24 and flanged fittings with rating class designation 2500 in sizes NPS through NPS 12 that are acknowledged in Non-Mandatory Appendix E in which only U.S. Customary units are provided.
B16.5 is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
This Standard is to be used in conjunction with equipment described in other volumes of the ASME B16 Series of Standards as well as with other ASME standards, such as the Boiler and Pressure Vessel Code and the B31 Piping Codes.
Careful application of these B16 Standards will help users to comply with applicable regulations within their jurisdictions, while achieving the operational, cost and safety benefits to be gained from the many industry best-practices detailed within these volumes.
Intended for manufacturers, owners, employers, users and others concerned with the specification, buying, maintenance, training and safe use of valves with pressure equipment, plus all potential governing entities.
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Pipe Flanges and Flanged Fittings
NPS ½ Through NPS 24 Metric/Inch Standard
AN A MERICAN NA TIONAL S T AND ARD
ASME B16.5-2020
(Revision of ASME B16.5-2017)
ASME B16.5-2020
(Revision of ASME B16.5-2017)
Pipe Flanges and
Flanged Fittings
NPS 1⁄2 Through NPS 24 Metric/Inch Standard
AN AMERICAN NATIONAL STANDARD
Date of Issuance: January 29, 2021
The next edition of this Standard is scheduled for publication in 2024.
ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME B16 Committee may be published as Cases. Cases and interpretations are published on the ASME website under the Committee Pages at https://cstools.asme.org/ as they are issued.
Errata to codes and standards may be posted on the ASME website under the Committee Pages to provide corrections to incorrectly published items, or to correct typographical or grammatical errors in codes and standards. Such errata shall be used on the date posted.
The Committee Pages can be found at https://cstools.asme.org/. There is an option available to automatically receive an e-mail notification when errata are posted to a particular code or standard. This option can be found on the appropriate Committee Page after selecting “Errata” in the “Publication Information” 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 National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available 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” 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 any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard.
ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME 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 American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990
Copyright © 2021 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved Printed in U.S.A.
CONTENTS
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Correspondence With the B16 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
List of Changes in Record Number Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Pressure–Temperature Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3 Component Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
5 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7 Tolerances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Pressure Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mandatory Appendices
I Threading of Pipe for American National Standard Threaded Flanges . . . . . . . . . . . . . . . . . . 189
II References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Nonmandatory Appendices
A | Method Used for Establishing Pressure–Temperature Ratings . . . . . . . . . . . . . . . . . . . . . . . . | 194 |
B | Limiting Dimensions of Gaskets Other Than Ring Joint Gaskets . . . . . . . . . . . . . . . . . . . . . . . | 198 |
C | Method for Calculating Bolt Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 200 |
D | Quality System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 202 |
E | Dimensions of Classes 400, 600, 900, 1500, and 2500 Flanged Fittings in U.S. Customary Units | 203 |
F | Method Used to Establish SI Unit Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 231 |
Figures | ||
1 | Bevel for Outside Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
2 | Bevel for Inside Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
3 | Bevel for Combined Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
4 | Straight Hub Welding Flanges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
5 | Method of Designating Outlets of Reducing Fittings in Specifications (Flanged Fittings) . . . . . | 16 |
6 | End Flange Facings and Their Relationship to Flange Thickness and Center-to-End and End-to-End Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 17 |
7 | Welding Neck Flange Hub and Welding End Profiles for Wall Thicknesses t From 5 mm (0.19 in.) to 22 mm (0.88 in.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
8 | Welding Neck Flange Hub and Welding End Profiles for Wall Thicknesses t Greater Than 22 mm (0.88 in.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
9 | Inside Contour for Use With Rectangular Backing Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
10 | Inside Contour for Use With Taper Backing Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
11 | Thread Length for Connection Tapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
12 | Socket Welding for Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
13 | Bosses for Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
14 | Butt Welding for Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
15 | Method of Designating Location of Auxiliary Connections When Specified (Flanged Fittings) . | 23 |
C-1 | Specified Machine Bolt Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 200 |
C-2 | Specified Stud Bolt Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 200 |
Tables 1.1-1 | List of Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 5 |
1.1-2 | List of Bolting Specifications: Applicable ASTM Specifications . . . . . . . . . . . . . . . . . . . . . . . . | 9 |
1.1-3 | Flange Bolting Dimensional Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 12 |
2-1.1 | Pressure–Temperature Ratings for Group 1.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 24 |
2-1.1C | Pressure–Temperature Ratings for Group 1.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 25 |
2-1.2 | Pressure–Temperature Ratings for Group 1.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 26 |
2-1.2C | Pressure–Temperature Ratings for Group 1.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 27 |
2-1.3 | Pressure–Temperature Ratings for Group 1.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 28 |
2-1.3C | Pressure–Temperature Ratings for Group 1.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 29 |
2-1.4 | Pressure–Temperature Ratings for Group 1.4 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 30 |
2-1.4C | Pressure–Temperature Ratings for Group 1.4 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 31 |
2-1.5 | Pressure–Temperature Ratings for Group 1.5 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 32 |
2-1.5C | Pressure–Temperature Ratings for Group 1.5 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 33 |
2-1.7 | Pressure–Temperature Ratings for Group 1.7 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 34 |
2-1.7C | Pressure–Temperature Ratings for Group 1.7 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 35 |
2-1.9 | Pressure–Temperature Ratings for Group 1.9 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
2-1.9C | Pressure–Temperature Ratings for Group 1.9 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 37 |
2-1.10 | Pressure–Temperature Ratings for Group 1.10 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 38 |
2-1.10C | Pressure–Temperature Ratings for Group 1.10 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 39 |
2-1.11 | Pressure–Temperature Ratings for Group 1.11 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 40 |
2-1.11C | Pressure–Temperature Ratings for Group 1.11 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 41 |
2-1.13 | Pressure–Temperature Ratings for Group 1.13 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 42 |
2-1.13C | Pressure–Temperature Ratings for Group 1.13 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 43 |
2-1.14 | Pressure–Temperature Ratings for Group 1.14 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 44 |
2-1.14C | Pressure–Temperature Ratings for Group 1.14 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 45 |
2-1.15 | Pressure–Temperature Ratings for Group 1.15 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 46 |
2-1.15C | Pressure–Temperature Ratings for Group 1.15 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 47 |
2-1.17 | Pressure–Temperature Ratings for Group 1.17 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 48 |
2-1.17C | Pressure–Temperature Ratings for Group 1.17 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 49 |
2-1.18 | Pressure–Temperature Ratings for Group 1.18 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 50 |
2-1.18C | Pressure–Temperature Ratings for Group 1.18 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 51 |
2-2.1 | Pressure–Temperature Ratings for Group 2.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 52 |
2-2.1C | Pressure–Temperature Ratings for Group 2.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 53 |
2-2.2 | Pressure–Temperature Ratings for Group 2.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 54 |
2-2.2C | Pressure–Temperature Ratings for Group 2.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 55 |
2-2.3 | Pressure–Temperature Ratings for Group 2.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 56 |
2-2.3C | Pressure–Temperature Ratings for Group 2.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 56 |
2-2.4 | Pressure–Temperature Ratings for Group 2.4 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 57 |
2-2.4C | Pressure–Temperature Ratings for Group 2.4 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 58 |
2-2.5 | Pressure–Temperature Ratings for Group 2.5 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 59 |
2-2.5C | Pressure–Temperature Ratings for Group 2.5 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 60 |
2-2.6 | Pressure–Temperature Ratings for Group 2.6 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 61 |
2-2.6C | Pressure–Temperature Ratings for Group 2.6 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 62 |
2-2.7 | Pressure–Temperature Ratings for Group 2.7 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 63 |
2-2.7C | Pressure–Temperature Ratings for Group 2.7 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 64 |
2-2.8 | Pressure–Temperature Ratings for Group 2.8 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 65 |
2-2.8C | Pressure–Temperature Ratings for Group 2.8 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 65 |
2-2.9 | Pressure–Temperature Ratings for Group 2.9 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 66 |
2-2.9C | Pressure–Temperature Ratings for Group 2.9 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 67 |
2-2.10 | Pressure–Temperature Ratings for Group 2.10 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 68 |
2-2.10C | Pressure–Temperature Ratings for Group 2.10 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 69 |
2-2.11 | Pressure–Temperature Ratings for Group 2.11 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 70 |
2-2.11C | Pressure–Temperature Ratings for Group 2.11 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 71 |
2-2.12 | Pressure–Temperature Ratings for Group 2.12 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 72 |
2-2.12C | Pressure–Temperature Ratings for Group 2.12 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . | 73 |
2-3.1 | Pressure–Temperature Ratings for Group 3.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 74 |
2-3.1C | Pressure–Temperature Ratings for Group 3.1 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 74 |
2-3.2 | Pressure–Temperature Ratings for Group 3.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 75 |
2-3.2C | Pressure–Temperature Ratings for Group 3.2 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 75 |
2-3.3 | Pressure–Temperature Ratings for Group 3.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 76 |
2-3.3C | Pressure–Temperature Ratings for Group 3.3 Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 77 |
2-3.4 | Pressure–Temperature Ratings for Group 3.4 Materials . . . . . . . . . . . . . . . . . . . . . . . . |