CONTENTS. Foreword... Committee Roster Introduction Summary of Changes

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5 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 11 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 15 Table Tensile Testing 16 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 21 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 32 Tables Reinforcement of Welded Branch Connections, Special Requirements Thermal Expansion or Contraction of Piping Materials 29 viii x xiii xv iii

6 Chapter IV Modulus of Elasticity for Carbon and Low Alloy Steel 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 Tables Basic Design Factor, F 38 Design Factors for Steel Pipe Construction 39 Longitudinal Joint Factor, E 40 Temperature Derating Factor, T, for Steel Pipe 40 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 47 Maximum Hoop Stress Permissible During an Air or Gas Test Standard Thickness Selection Table for Ductile Iron Pipe 49 Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe 51 Diameter and Wall Thickness for Reinforced Thermosetting Plastic Pipe '" Nominal Values for Coefficients of Thermal Expansion of Thermoplastic Pipe Materials Design Factors, F 58 Minimum Clearance Between Containers and Fenced Boundaries 58 Maximum Allowable Operating Pressure for Steel or Plastic Pipelines or Mains 60 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) 61 Chapter V 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 iv

7 Figure Table Allowable Ripple Heights 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 Chapter VII Chapter VIII A800 A801 A802 A803 A811 A814 A817 A820 A821 A823 A825 A826 A830 A831 A832 A834 A835 A840 A841 A842 A843 A844 A846 A847 A850 A851 A854 A860 A861 A862 A864 Corrosion Control Corrosion Control - General 90 External Corrosion Control for Steel Pipelines Cathodic Protection Criteria 93 Operation and Maintenance of Cathodic Protection Systems 93 Internal Corrosion Control 93 Steel Pipelines in Arctic Environments 94 Steel Pipelines in High-Temperature Service 95 Stress Corrosion and Other Phenomena Cast Iron, Wrought Iron, Ductile Iron, and Other Metallic Pipelines 96 Intentionally Left Blank Offshore Gas Transmission Offshore Gas Transmission 98 General Scope and Intent 98 Offshore Gas Transmission Terms and Definitions Qualification of Materials and Equipment 99 Material Specifications 99 Conditions for the Reuse and Requalification of Pipe 100 Welding Offshore Pipelines General 100 Qualification of Procedures and Welders 100 Stress Relieving Inspection of Welds 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 102 Strength Considerations 103 Compressor Stations 106 On-Bottom Stability 106 Valves Testing 108 Operating and Maintenance Procedures Affecting the Safety of Gas Transmission Facilities 108 Pipeline Maintenance 109 Location Class 110 Corrosion Control of Offshore Pipelines External Corrosion Control 110 Cathodic Protection Criteria 111 Internal Corrosion Control 112 v

8 Table A Chapter IX B800 B801 B802 B803 B813 B814 B820 B821 B822 B823 B824 B825 B826 B830 B831 B840 B841 B842 B843 B844 B850 B851 B854 B860 B861 B864 B867 Tables B B B850,l-3 B Appendices Mandatory Appendix A Mandatory Appendix B Nonmandatory Appendix C Mandatory Appendix 0 Mandatory Appendix E Mandatory AppendiX F Mandatory AppendiX G Mandatory Appendix H Mandatory AppendiX I Nonmandatory AppendiX J Design Factors for Offshore Pipelines, Platform Piping, and Pipeline Risers,, Sour Gas Service Sour Gas Service General ", ", Scope and Intent,., " "" Sour Gas Terms and Definitions Marking.. ', Material Specifications Welding Sour Gas Pipelines General,, Preparation for Welding,.,. 104,,..,, ,.., ', " ,,,.. 113,,, " 113 "",,.. 114,.. ",.',., ,,,,.,.,.. 114,,, Qualification of Procedures and Welders Preheating".. ", Stress Relieving,,,.",..,, Welding and Inspection Tests..,,,,,,,,,,,,,,.,.,. " 115 Piping System Components and Fabrication Details..., Piping System Components,.., ",." 115 Design, Installation, and Testing,,,.,,,,..,,,,. 115 Steel Pipe,,..,,,,,,,,, Other Materials,,. 116 Compressor Stations,,' Pipe-Type and Bottle-Type Holders,.,.. ", Additional Operating and Maintenance Considerations Affecting the Safety of Sour Gas Pipelines,, Pipeline Maintenance,,,.., Location Class and Changes in Number of Buildings Intended for Human Occupancy.,, Corrosion Control of Sour Gas Pipelines,'. 118 External Corrosion Control for Steel Pipelines Internal Corrosion Control " Stress Corrosion and Other Phenomena ppm ROE, ppm ROE,,,,., Metric Example for 100-ppm ROE", ".".,,. 117 Metric Example for 500-ppm ROE ',,, References,,.,.., ".., '".",. 121 Numbers and Subjects of Standards and Specifications That Appear in Mandatory AppendiX A ".. "" 124 Publications That Do Not Appear in the Code or Mandatory AppendiX A,.. "".. ""."." Specified Minimum Yield Strength for Steel Pipe Commonly Used in Piping Systems, """,. 128 Flexibility and Stress Intensification Factors, "", Extruded Headers and Welded Branch Connections 136 Testing of Welders Limited to Work on Lines Operating at Hoop Stresses of Less Than 20% of the Specified Minimum Yield Strength "..,,."""" Flattening Test for Pipe...,.. " "",.,..,.",..., 145 End Preparations for Buttwelding ",.. ".,,."",.., 146 Commonly Used Conversion Factors "",..,.".", 155 vi

9 Mandatory Appendix K Criteria for Cathodic Protection 159 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 169 Nonmandatory Appendix 0 Preparation of Technical Inquiries 171 Nonmandatory Appendix P Nomenclature for Figures 172 Mandatory Appendix Q Scope Diagrams Nonmandatory Appendix R Estimating Strain in Dents 176 Index vii