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ASME B31.8-2018
M00050502
New product
ASME B31.8-2018 Gas Transmission and Distribution Piping Systems
standard by ASME International, 11/20/2018
Full Description
This Code covers the design, fabrication, installation,inspection, and testing of pipeline facilities usedfor the transportation of gas. This Code also coverssafety aspects of the operation and maintenance ofthose facilities.This Code is concerned only with certain safety aspectsof liquefied petroleum gases when they are vaporized andused as gaseous fuels. All of the requirements of NFPA 58and NFPA 59 and of this Code concerning design, construction,and operation and maintenance of piping facilitiesshall apply to piping systems handling butane,propane, or mixtures of these gases.
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Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN INTERNA TIONAL PIPING C ODE ®
ASME B31.8-2018
(Revision of ASME B31.8-2016)
ASME B31.8-2018
(Revision of ASME B31.8-2016)
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: 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.
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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.
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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.
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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
General Provisions and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 | |
801 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
802 | Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 1 |
803 | Piping Systems Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 2 |
804 | Piping Systems Component Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 4 |
805 | Design, Fabrication, Operation, and Testing Terms and Definitions . . . . . . . . . . . . . . . . . . | 7 |
806 | Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 12 |
807 | Training and Qualification of Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 13 |
Chapter I | Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 14 |
810 | Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 14 |
811 | Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 14 |
812 | Materials for Use in Low-Temperature Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
813 | Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
814 | Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 15 |
815 | Equipment Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
816 | Transportation of Line Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
817 | Conditions for the Reuse of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 16 |
Chapter II | Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
820 | Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
821 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
822 | Preparation for Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 19 |
823 | Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
824 | Preheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
825 | Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 20 |
826 | Weld Inspection Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 21 |
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 . . . . . . . . . . . . . . . . . . . . . . . . | 22 |
Chapter III | Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . . . | 23 |
830 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 23 |
831 | Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 23 |
832 | Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 30 |
833 | Design for Longitudinal Stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 31 |
834 | Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 34 |
835 | Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 34 |
836 | Liquid Removal Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 35 |
Chapter IV | Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
840 | Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 36 |
841 | Steel Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 38 |
842 | Other Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 51 |
843 | Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 59 |
844 | Pipe-Type and Bottle-Type Holders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 62 |
845 | Control and Limiting of Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 63 |
846 | Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 68 |
847 | Vaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 69 |
848 | Customers' Meters and Regulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 70 |
849 | Gas Service Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 71 |
Chapter V | Operating and Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 76 |
850 | Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 76 |
851 | Pipeline Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 79 |
852 | Distribution Piping Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 85 |
853 | Miscellaneous Facilities Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 88 |
854 | Location Class and Changes in Number of Buildings Intended for Human Occupancy . . . . . | 91 |
855 | Pipeline Service Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 93 |
856 | Odorization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 93 |
857 | Uprating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 94 |
Chapter VI | Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 97 |
860 | Corrosion Control — General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 97 |
861 | External Corrosion Control for Steel Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 98 |
862 | Cathodic Protection Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 100 |
863 | Operation and Maintenance of Cathodic Protection Systems . . . . . . . . . . . . . . . . . . . . . . . | 100 |
864 | Internal Corrosion Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 100 |
865 | Steel Pipelines in Arctic Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 102 |
866 | Steel Pipelines in High-Temperature Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 102 |
867 | Stress Corrosion and Other Phenomena . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 103 |
868 | Cast Iron, Wrought Iron, Ductile Iron, and Other Metallic Pipelines . . . . . . . . . . . . . . . . . . | 103 |
Chapter VIII | Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
A800 | Offshore Gas Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
A801 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
A802 | Scope and Intent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
A803 | Offshore Gas Transmission Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 105 |
A811 | Qualification of Materials and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A814 | Material Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A817 | Conditions for the Reuse and Requalification of Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A820 | Welding Offshore Pipelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A821 | General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 107 |
A823 | Qualification of Procedures and Welders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
A825 | Stress Relieving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
A826 | Inspection of Welds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
A830 | Piping System Components and Fabrication Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
A831 | Piping System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 108 |
A832 | Expansion and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A834 | Supports and Anchorage for Exposed Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A835 | Anchorage for Buried Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A840 | Design, Installation, and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A841 | Design Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 109 |
A842 | Strength Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 110 |
A843 | Compressor Stations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 114 |
A844 | On-Bottom Stability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 115 |
A846 | Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | 116 |
A847 | Testing . . |