Asme_B31.8_Ed.2018.pdf - ASME B31.8-2018(Revision of ASME B31.8-2016 Gas Transmission and Distribution Piping Systems ASME Code for Pressure Piping B31

Asme_B31.8_Ed.2018.pdf - ASME B31.8-2018(Revision of ASME...

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Unformatted text preview: ASME B31.8-2018 (Revision of ASME B31.8-2016) Gas Transmission and Distribution Piping Systems ASME Code for Pressure Piping, B31 A N I N T E R N AT I O N A L P I P I N G CO D E ® ASME B31.8-2018 (Revision of ASME B31.8-2016) Gas Transmission and Distribution Piping Systems x ASME Code for Pressure Piping, B31 AN INTERNATIONAL PIPING CODE® Two Park Avenue • New York, NY • 10016 USA Date of Issuance: November 20, 2018 The next edition of this Code is scheduled for publication in 2020. This Code will become effective 6 months after the Date of Issuance. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code. Interpretations are published on the Committee web page and under . Periodically certain actions of the ASME B31 Committee may be published as Cases. Cases are published on the ASME website under the B31 Committee Page at as they are issued. Errata to codes and standards may be posted on the ASME website under the Committee Pages of the associated codes and standards 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 B31 Committee Page can be found at . The associated B31 Committee Pages for each code and standard can be accessed from this main page. 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 international code or standard was developed under procedures accredited as meeting the criteria for American National Standards and it is an American National Standard. 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-atlarge. 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 © 2018 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A. CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv Summary of Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi 801 802 803 804 805 806 807 Chapter I 810 General Provisions and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piping Systems Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piping Systems Component Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design, Fabrication, Operation, and Testing Terms and Definitions . . . . . . . . . . . . . . Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Training and Qualification of Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 1 2 4 7 12 13 14 14 811 812 813 814 815 816 817 Chapter II 820 821 Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Materials for Use in Low-Temperature Applications . . . . . . . . . . . . . . . . . . . . . . . . . Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transportation of Line Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conditions for the Reuse of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 15 15 15 16 16 16 19 19 19 822 823 824 825 826 827 Preparation for Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Weld Inspection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Repair or Removal of Defective Welds in Piping Intended to Operate at Hoop Stress Levels of 20% or More of the Specified Minimum Yield Strength . . . . . . . . . . . . . . . . . . . . . . . . Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design for Longitudinal Stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 20 20 20 21 Chapter III 830 831 832 833 834 835 iii 22 23 23 23 30 31 34 34 836 Chapter IV 840 841 842 843 844 845 846 847 848 849 Liquid Removal Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pipe-Type and Bottle-Type Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control and Limiting of Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customers' Meters and Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Service Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter V 850 851 852 853 854 855 856 857 Chapter VI 860 861 862 863 Operating and Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pipeline Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Distribution Piping Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Miscellaneous Facilities Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Location Class and Changes in Number of Buildings Intended for Human Occupancy . . . Pipeline Service Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Odorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Uprating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Corrosion Control — General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Corrosion Control for Steel Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cathodic Protection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation and Maintenance of Cathodic Protection Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 79 85 88 91 93 93 94 97 97 98 100 100 864 865 866 867 868 Chapter VIII A800 A801 A802 A803 A811 A814 A817 A820 A821 A823 A825 A826 Internal Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Pipelines in Arctic Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Pipelines in High-Temperature Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stress Corrosion and Other Phenomena . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cast Iron, Wrought Iron, Ductile Iron, and Other Metallic Pipelines . . . . . . . . . . . . . . Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Offshore Gas Transmission Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Conditions for the Reuse and Requalification of Pipe . . . . . . . . . . . . . . . . . . . . . . . . Welding Offshore Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inspection of Welds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 102 102 103 103 105 105 105 105 105 107 107 107 107 107 108 108 108 iv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 36 36 38 51 59 62 63 68 69 70 71 .. 76 . . . . . . . . . . . . A830 A831 A832 A834 A835 A840 A841 A842 A843 A844 A846 A847 Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Strength Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . On-Bottom Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 108 109 109 109 109 109 110 114 115 116 116 A850 A851 A854 A860 A861 Operating and Maintenance Procedures Affecting the Safety of Gas Transmission Facilities Pipeline Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Location Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Corrosion Control of Offshore Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 117 118 118 118 A862 A864 Chapter IX B800 B801 Cathodic Protection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internal Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sour Gas Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sour Gas Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 120 121 121 121 B802 B803 B813 B814 B820 B821 B822 B823 B824 B825 B826 B830 B831 B840 B841 B842 B843 B844 B850 B851 Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sour Gas Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Welding Sour Gas Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preparation for Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Welding and Inspection Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pipe-Type and Bottle-Type Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Additional Operating and Maintenance Considerations Affecting the Safety of Sour Gas Pipelines Pipeline Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 121 122 122 122 122 122 122 123 123 123 123 123 123 123 124 124 124 125 125 B854 B860 B861 Location Class and Changes in Number of Buildings Intended for Human Occupancy . . . . . Corrosion Control of Sour Gas Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . External Corrosion Control for Steel Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 127 127 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B864 B867 Internal Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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