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ASME B31.8-2007
M00050781
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ASME B31.8-2007 Gas Transmission and Distribution Piping Systems
standard by ASME International, 11/30/2007
Full Description
View contents.This Code covers the design, fabrication, installation, inspection, and testing of pipeline facilities used for the transportation of gas. This Code also covers safety aspects of the operation and maintenance of those facilities.
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ASME B31.8-2007
(Revision of ASME B31.8-2003)
Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
A N A M E R I C A N N A T I O N A L S T A N D A R D
Copyright 2007 by the American Society of Mechanical Engineers.
No reproduction may be made of this material without written consent of ASME.
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ASME B31.8-2007
(Revision of ASME B31.8-2003)
Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN AMERICAN NA TIONAL S T AND ARD
Three Park Avenue • New York, NY 10016
Date of Issuance: November 30, 2007
The next edition of this Code is scheduled for publication in 2009. There will be no addenda issued to this edition.
ASME issues written replies to inquiries concerning interpretations of technical aspects of this Code. The interpretations will be included with this edition. Interpretations are published on the ASME Web site under the Committee Pages at https://cstools.asme.org as they are issued.
ASME is the registered trademark of The American Society of Mechanical Engineers.
This code 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.
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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 Three Park Avenue, New York, NY 10016-5990
Copyright © 2007 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All rights reserved Printed in U.S.A.
CONTENTS
Foreword vii
Committee Roster ix
Introduction xii
Summary of Changes xiv
General Provisions and Definitions
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 ........................ | 6 |
807 | Quality Assurance ....................................................... | 7 |
Chapter I | Materials and Equipment | |
810 | Materials and Equipment ................................................ | 8 |
811 | Qualification of Materials and Equipment ................................ | 8 |
812 | Materials for Use in Cold Climates ....................................... | 9 |
813 | Marking ................................................................. | 9 |
814 | Material Specifications ................................................... | 9 |
815 | Equipment Specifications ................................................. | 9 |
816 | Transportation of Line Pipe .............................................. | 9 |
817 | Conditions for the Reuse of Pipe ......................................... | 10 |
Chapter II | Welding | |
820 | Welding ................................................................. | 12 |
821 | General .................................................................. | 12 |
822 | Preparation for Welding .................................................. | 12 |
823 | Qualification of Procedures and Welders .................................. | 12 |
824 | Preheating ............................................................... | 13 |
825 | Stress Relieving .......................................................... | 13 |
826 | Inspection of Welds ...................................................... | 14 |
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 ............................................................... | 15 |
Chapter III | Piping System Components and Fabrication Details | |
830 | Piping System Components and Fabrication Details ....................... | 16 |
831 | Piping System Components .............................................. | 16 |
832 | Expansion and Flexibility ................................................ | 22 |
833 | Design for Longitudinal Stress ........................................... | 23 |
834 | Supports and Anchorage for Exposed Piping ............................. | 26 |
835 | Anchorage for Buried Piping ............................................. | 26 |
Tables | ||
831.42 | Reinforcement of Welded Branch Connections, Special Requirements ...... | 21 |
832.2 | Thermal Expansion of Carbon and Low Alloy Steel ....................... | 23 |
832.5 | Modulus of Elasticity for Carbon and Low Alloy Steel .................... | 23 |
Chapter IV | Design, Installation, and Testing | |
840 | Design, Installation, and Testing .......................................... | 28 |
841 | Steel Pipe ................................................................ | 30 |
842 | Other Materials .......................................................... | 41 |
843 | Compressor Stations ..................................................... | 48 |
iii
844 | Pipe-Type and Bottle-Type Holders ....................................... | 51 |
845 | Control and Limiting of Gas Pressure .................................... | 52 |
846 | Valves ................................................................... | 59 |
847 | Vaults ................................................................... | 60 |
848 | Customers’ Meters and Regulators ....................................... | 61 |
849 | Gas Service Lines ........................................................ | 62 |
Tables | ||
841.114A | Basic Design Factor, F .................................................... | 32 |
841.114B | Design Factors for Steel Pipe Construction ................................ | 32 |
841.115A | Longitudinal Joint Factor, E .............................................. | 33 |
841.116A 841.322(f) | Temperature Derating Factor, T, for Steel Pipe ............................ Test Requirements for Pipelines and Mains to Operate at Hoop Stresses of 30% or More of the Specified Minimum Yield Strength of the Pipe ............................................................... | 33 40 |
841.33 | Maximum Hoop Stress Permissible During Test ........................... | 41 |
842.214 | Standard Thickness Selection Table for Ductile Iron Pipe .................. | 43 |
842.32(c) 842.33(c) 842.396(c) | Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe .... Diameter and Wall Thickness for Reinforced Thermosetting Plastic Pipe ............................................................ Nominal Values for Coefficients of Thermal Expansion of Thermoplastic Pipe Materials ......................................................... | 44 44 46 |
Chapter V | Operating and Maintenance Procedures | |
850 | Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities ................................ | 66 |
851 | Pipeline Maintenance .................................................... | 68 |
852 | Distribution Piping Maintenance ......................................... | 73 |
853 | Miscellaneous Facilities Maintenance ..................................... | 76 |
854 | Location Class and Changes in Number of Buildings Intended for Human Occupancy .................................................... | 78 |
855 | Concentrations of People in Location Classes 1 and 2 ..................... | 80 |
856 | Pipeline Service Conversions ............................................. | 80 |
Table | ||
854.1(c) | Location Class ........................................................... | 79 |
Chapter VI | Corrosion Control | |
860 | Corrosion Control ........................................................ | 82 |
861 | Scope .................................................................... | 82 |
862 | External Corrosion Control ............................................... | 82 |
863 | Internal Corrosion Control ............................................... | 85 |
864 | Pipelines in Arctic Environments ......................................... | 87 |
865 | Pipelines in High-Temperature Service .................................... | 88 |
866 | Stress Corrosion and Other Phenomena .................................. | 88 |
867 | Records ................................................................. | 89 |
Chapter VII | Miscellaneous | |
870 | Miscellaneous ........................................................... | 90 |
871 | Odorization ............................................................. | 90 |
872 | Liquefied Petroleum Gas (LPG) Systems .................................. | 90 |
873 | Pipelines on Private Rights-of-Way of Electric Transmission Lines ......... | 91 |
Chapter VIII | Offshore Gas Transmission | |
A800 | Offshore Gas Transmission ............................................... | 92 |
A801 | General .................................................................. | 92 |
A802 | Scope and Intent ......................................................... | 92 |
A803 | Offshore Gas Transmission Definitions .................................... | 92 |
A811 | Qualification of Materials and Equipment ................................ | 93 |
A814 | Material Specifications ................................................... | 93 |
iv
A817 Conditions for the Reuse and Requalification of Pipe 93
A820 Welding Offshore Pipelines 94
A821 General 94
A823 Qualification of Procedures and Welders 94
A825 Stress Relieving 94
A826 Welding and Inspection Tests 94
A830 Piping System Components and Fabrication Details 95
A831 Piping System Components 95
A832 Expansion and Flexibility 95
A834 Supports and Anchorage for Exposed Piping 95
A835 Anchorage for Buried Piping 95
A840 Design, Installation, and Testing 95
A841 Design Considerations 95
A842 Strength Considerations 97
A843 Compressor Stations 99
A844 On-Bottom Stability 100
A846 Valves 101
A847 Testing 101
A850 Operating and Maintenance Procedures Affecting the Safety of Gas
Transmission Facilities 102
A851 Pipeline Maintenance 103
A854 Location Class 103
A860 Corrosion Control of Offshore Pipelines 103
A861 Scope 103
A862 External Corrosion Control 103
A863 Internal Corrosion Control 105
Table
A842.22 Design Factors for Offshore Pipelines, Platform Piping, and Pipeline
Risers 98
Chapter IX Sour Gas Service
B800 Sour Gas Service 106
B801 General 106
B802 Scope and Intent 106