Gas Transmission and Distribution Piping Systems

Transcription

1 ASME B (Revision of ASME B ) 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

2 ASME B (Revision of ASME B ) Gas Transmission and Distribution Piping Systems ASME Code for Pressure Piping, B31 AN AMERICAN NATIONAL STANDARD

3 Date of Issuance: June 1, 2010 The next edition of this Code is scheduled for publication in 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 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. 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 Three Park Avenue, New York, NY Copyright 2010 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed in U.S.A.

4 CONTENTS Foreword... Committee Roster... Introduction... Summary of Changes... General Provisions and Definitions 801 General Scope and Intent Piping Systems Definitions Piping Systems Component Definitions Design, Fabrication, Operation, and Testing Terms and Definitions Quality Assurance Chapter I Materials and Equipment 810 Materials and Equipment 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 Table Tensile Testing Chapter II Welding 820 Welding General 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 Chapter III Piping System Components and Fabrication Details 830 Piping System Components and Fabrication Details Piping System Components Expansion and Flexibility Design for Longitudinal Stress Supports and Anchorage for Exposed Piping Anchorage for Buried Piping Tables Reinforcement of Welded Branch Connections, Special Requirements Thermal Expansion or Contraction of Piping Materials iii viii x xiii xv

5 Modulus of Elasticity for Carbon and Low Alloy Steel Chapter IV Design, Installation, and Testing 840 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 Tables Basic Design Factor, F Design Factors for Steel Pipe Construction Longitudinal Joint Factor, E Temperature Derating Factor, T, for Steel Pipe Pipeline Cover Requirements Pipeline Field Cold Bend Requirements Test Requirements for Steel Pipelines and Mains to Operate at Hoop Stresses of 30% or More of the Specified Minimum Yield Strength of the Pipe Maximum Hoop Stress Permissible During an Air or Gas Test Standard Thickness Selection Table for Ductile Iron Pipe 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 Design Factors, F Minimum Clearance Between Containers and Fenced Boundaries Maximum Allowable Operating Pressure for Steel or Plastic Pipelines or Mains Maximum Allowable Operating Pressure for Pipelines Operating at 100 psig (690 kpa) or More Maximum Allowable Operating Pressure for Pipelines Operating at Less Than 100 psig (690 kpa) Chapter V Operating and Maintenance Procedures 850 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 iv

6 Figure Allowable Ripple Heights Table Wall Thickness for Unlikely Occurrence of Burn- Through Location Class Wall Thickness Allowance for Uprating a Ductile Iron High-Pressure Main or System Chapter VI Corrosion Control 860 Corrosion Control General External Corrosion Control for Steel Pipelines Cathodic Protection Criteria Operation and Maintenance of Cathodic Protection Systems 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 Chapter VII Intentionally Left Blank Chapter VIII Offshore Gas Transmission A800 Offshore Gas Transmission A801 General A802 Scope and Intent A803 Offshore Gas Transmission Terms and Definitions A811 Qualification of Materials and Equipment A814 Material Specifications A817 Conditions for the Reuse and Requalification of Pipe A820 Welding Offshore Pipelines A821 General A823 Qualification of Procedures and Welders A825 Stress Relieving A826 Inspection of Welds A830 Piping System Components and Fabrication Details A831 Piping System Components A832 Expansion and Flexibility A834 Supports and Anchorage for Exposed Piping A835 Anchorage for Buried Piping A840 Design, Installation, and Testing A841 Design Considerations A842 Strength Considerations A843 Compressor Stations A844 On-Bottom Stability A846 Valves A847 Testing A850 Operating and Maintenance Procedures Affecting the Safety of Gas Transmission Facilities A851 Pipeline Maintenance A854 Location Class A860 Corrosion Control of Offshore Pipelines A861 External Corrosion Control A862 Cathodic Protection Criteria A864 Internal Corrosion Control v

7 Table A Design Factors for Offshore Pipelines, Platform Piping, and Pipeline Risers Chapter IX Sour Gas Service B800 Sour Gas Service B801 General B802 Scope and Intent B803 Sour Gas Terms and Definitions B813 Marking B814 Material Specifications B820 Welding Sour Gas Pipelines B821 General B822 Preparation for Welding B823 Qualification of Procedures and Welders B824 Preheating B825 Stress Relieving B826 Welding and Inspection Tests B830 Piping System Components and Fabrication Details B831 Piping System Components B840 Design, Installation, and Testing B841 Steel Pipe B842 Other Materials B843 Compressor Stations B844 Pipe-Type and Bottle-Type Holders B850 Additional Operating and Maintenance Considerations Affecting the Safety of Sour Gas Pipelines B851 Pipeline Maintenance B854 Location Class and Changes in Number of Buildings Intended for Human Occupancy B860 Corrosion Control of Sour Gas Pipelines B861 External Corrosion Control for Steel Pipelines B864 Internal Corrosion Control B867 Stress Corrosion and Other Phenomena Tables B ppm ROE B ppm ROE B Metric Example for 100-ppm ROE B Metric Example for 500-ppm ROE Appendices Mandatory Appendix A References Mandatory Appendix B Numbers and Subjects of Standards and Specifications That Appear in Mandatory Appendix A Nonmandatory Appendix C Publications That Do Not Appear in the Code or Mandatory Appendix A Mandatory Appendix D Specified Minimum Yield Strength for Steel Pipe Commonly Used in Piping Systems Mandatory Appendix E Flexibility and Stress Intensification Factors Mandatory Appendix F Extruded Headers and Welded Branch Connections Mandatory Appendix G Testing of Welders Limited to Work on Lines Operating at Hoop Stresses of Less Than 20% of the Specified Minimum Yield Strength Mandatory Appendix H Flattening Test for Pipe Mandatory Appendix I End Preparations for Buttwelding Nonmandatory Appendix J Commonly Used Conversion Factors vi

8 Mandatory Appendix K Criteria for Cathodic Protection Nonmandatory Appendix L Determination of Remaining Strength of Corroded Pipe Nonmandatory Appendix M Gas Leakage Control Criteria Nonmandatory Appendix N Recommended Practice for Hydrostatic Testing of Pipelines in Place Nonmandatory Appendix O Preparation of Technical Inquiries Nonmandatory Appendix P Nomenclature for Figures Mandatory Appendix Q Scope Diagrams Nonmandatory Appendix R Estimating Strain in Dents Index vii