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ASME B31.8-2020
M00050499
New product
ASME B31.8-2020 Gas Transmission and Distribution Piping Systems
standard by ASME International, 05/31/2021
Full Description
ASME has been defining piping safety since 1922.
ASME B31.8 covers gas transmission and distribution piping systems, including gas pipelines, gas compressor stations, gas metering and regulation stations, gas mains, and service lines up to the outlet of the customer's meter set assembly. It includes gas transmission and gathering pipelines, including appurtenances that are installed offshore for the purpose of transporting gas from production facilities to onshore locations; gas storage equipment of the closed pipe type that is fabricated or forged from pipe or fabricated from pipe and fittings; and gas storage lines.
Key changes to this revision include adding a new section on training and qualification of operating company personnel and a new section on developing a damage prevention program . In addition the plastic piping design formula section was revised in its entirety.
This Code prescribes comprehensive solutions for materials, design, fabrication, assembly, erection, testing and inspection. It also serves as a companion to ASME's other B31 codes on piping systems. Together, they remain essential references for anyone engaged with piping.
Careful application of these B31 codes 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, users, constructors, designers, pipeline operation and maintenance personnel, and regulatory personnel, plus all potential governing entities.
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Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN INTERNA TIONAL PIPING C ODE ®
ASME B31.8-2020
(Revision of ASME B31.8-2018)
ASME B31.8-2020
(Revision of ASME B31.8-2018)
Gas Transmission
and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN INTERNATIONAL PIPING CODE®
Two Park Avenue • New York, NY • 10016 USA
Date of Issuance: May 31, 2021
The next edition of this Code is scheduled for publication in 2022. 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 https://go.asme.org/Interpretations. 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 https://go.asme.org/B31committee 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 https://go.asme.org/B31committee. 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 competentand concerned interestshave 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Correspondence With the B31 Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
Summary of Changes xviii
General Provisions and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 | |
801 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
802 | Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
803 | Piping Systems Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
804 | Piping Systems Component Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 5 |
805 | Design, Fabrication, Operation, and Testing Terms and Definitions . . . . . . . . . . . . . . . . | 7 |
806 | Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 13 |
807 | Training and Qualification of Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 13 |
Chapter I | Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
810 | Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
811 | Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
812 | Materials for Use in Low-Temperature Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
813 | Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
814 | Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
815 | Equipment Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 17 |
816 | Transportation of Line Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 17 |
817 | Conditions for the Reuse of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 17 |
Chapter II | Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
820 | Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
821 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
822 | Preparation for Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
823 | Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
824 | Preheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
825 | Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
826 | Weld Inspection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
827 | 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 . . . . . . . . . . . . . . . . . . . . . . | 23 |
Chapter III | Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . | 24 |
830 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 24 |
831 | Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 24 |
832 | Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 31 |
833 | Design for Longitudinal Stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 32 |
834 | Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 35 |
835 | Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
836 | Liquid Removal Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
Chapter IV | Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 37 |
840 | Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 37 |
841 | Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 39 |
842 | Other Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 53 |
843 | Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 61 |
844 | Pipe-Type and Bottle-Type Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 64 |
845 | Control and Limiting of Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 65 |
846 | Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 71 |
847 | Vaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 72 |
848 | Customers’ Meters and Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 73 |
849 | Gas Service Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 74 |
Chapter V | Operating and Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 78 |
850 | Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 78 |
851 | Pipeline Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 81 |
852 | Distribution Piping Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 87 |
853 | Miscellaneous Facilities Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 90 |
854 | Location Class and Changes in Number of Buildings Intended for Human Occupancy . . . | 93 |
855 | Pipeline Service Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 95 |
856 | Odorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 96 |
857 | Uprating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 96 |
Chapter VI | Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 99 |
860 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 99 |
861 | External Corrosion Control for Steel Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 100 |
862 | Cathodic Protection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 102 |
863 | Operation and Maintenance of Cathodic Protection Systems . . . . . . . . . . . . . . . . . . . . . | 102 |
864 | Internal Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 102 |
865 | Steel Pipelines in Arctic Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
866 | Steel Pipelines in High-Temperature Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 104 |
867 | Stress Corrosion and Other Phenomena . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
868 | Cast Iron, Wrought Iron, Ductile Iron, and Other Metallic Pipelines . . . . . . . . . . . . . . . | 105 |
Chapter VII | Intentionally Left Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 106 |
Chapter VIII | Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A800 | Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A801 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A802 | Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A803 | Offshore Gas Transmission Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A811 | Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A814 | Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A817 | Conditions for the Reuse and Requalification of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A820 | Welding Offshore Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A821 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A823 | Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A825 | Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A826 | Inspection of Welds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A830 | Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A831 | Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A832 | Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A834 | Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 111 |
A835 | Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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