Gas Transmission & Distribution Piping Systems

Foreword vii
CommitteePersonnel ix
Introduction xii
SummaryofChanges xiv
GeneralProvisionsandDefinitions
801. General 1
802. ScopeandIntent 1
803. PipingSystemsDefinitions 2
804. PipingSystemsComponentDefinitions 4
805. Design,Fabrication,Operation,andTestingTerms 6
807QualityAssurance 7

Chapter I Materials and Equipment
810. Material 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 10
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 25
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 22
832.5 Modulus of Elasticity for Carbon and Low Alloy Steel 23

Chapter IV Design,Installation,and Testing
840. Design,Installation,and Testing 27
841.Steel Pipe 29
842.Other Materials 40
843.Compressor Stations 46

844. Pipe-Type and Bottle-Type Holders 49
845. Control and Limiting of Gas Pressure 50
846. Valves 58
847. Vaults 58
848.Customers’ Meters and Regulators 59
849. Gas Service Lines 60
Tables
841.114A. Basic Design Factor, F 30
841.114B. Design Factors for Steel Pipe Construction 31
841.115A.Longitudinal Joint Factor, E 32
841.116A. Temperature Derating Factor, T, for Steel Pipe 32
841.322.(f)Test Requirements for Pipelines and Mains to Operate at Hoop Stresses of 30% or More of the Specified Minimum Yield Strength of the Pipe 39
841.33.Maximum Hoop Stress Permissible During Test 39
842.214. Standard Thickness Selection Table for Ductile Iron Pipe 41
842.32(c). Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe 42
842.33(c). Diameter and Wall Thickness for Reinforced Thermo setting Plastic Pipe 42
842.396(c). Nominal Values for Coefficients of Thermal Expansion of Thermoplastic Pipe Materials 44

Chapter V Operating and Maintenance Procedures 850 Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities 64
851. Pipeline Maintenance 66
852. Distribution Piping Maintenance 71
853. Miscellaneous Facilities Maintenance 74
854. Location Class and Changes in Number of Buildings Intended for Human Occupancy 76
855. Concentrations of People in Location Classes1 and 2 77
856. Pipeline Service Conversions 78

Table
854.1(c). Location Class 77
Chapter VI Corrosion Control
860. Corrosion Control 79
861. Scope 79
862. External Corrosion Control 79
863. Internal Corrosion Control 82
864. Pipelines in Arctic Environments 84
865. Pipelines in High-Temperature Service 85
866. Stress Corrosion and Other Phenomena 85
867. Records 86

Chapter VII Miscellaneous
870. Miscellaneous 87
871. Odorization 87
872. Liquefied Petroleum Gas (LPG) Systems 87
873. Pipelines on Private Rights-of-Way of Electric Transmission Lines 88

Chapter VIII Offshore Gas Transmission
A800. Offshore Gas Transmission 89
A801. General 89
A802. Scope and Intent 89
A803.Offshore Gas Transmission Definitions 89
A811. Qualification of Materials and Equipment 90
A814. Material Specifications 90
A817.Conditions for the Reuse and Requalification of Pipe 90
A820. Welding Offshore Pipelines 91
A821. General 91
A823. Qualification of Procedures and Welders 91
A825. Stress Relieving 91
A826. Welding and Inspection Tests 91
A830. Piping System Components and Fabrication Details 92
A831. Piping System Components 92
A832. Expansion and Flexibility 92
A834. Supports and Anchorage for Exposed Piping 92
A835. Anchorage for Buried Piping 92
A840. Design,Installation,and Testing 92
A841. Design Considerations 92
A842. Strength Considerations 93
A843. Compressor Stations 96
A844. On-Bottom Stability 97
A846. Valves 98
A847. Testing 98
A850. Operating and Maintenance Procedures Affecting the Safety of Gas Transmission Facilities 99
A851. Pipeline Maintenance 99
A854. Location Class 100
A860. Corrosion Control of Offshore Pipelines 100
A861. Scope 100
A862. External Corrosion Control 100
A863. Internal Corrosion Control 102
Table
A842.22. Design Factors for Offshore Pipelines,Platform Piping,and Pipeline Risers 94

Chapter IX Sour Gas Service
B800. Sour Gas Service 103
B801. General 103
B802. Scope and Intent 103
B803. Sour Gas Terms and Definitions 103
B813. Marking 104
B814. Material Specifications 104
B820. Welding Sour Gas Pipelines 104
B821. General 104
B822. Preparation for Welding 104
B823. Qualifications of Procedures and Welders 104
B824. Preheating 104
B825. Stress Relieving 104
B826. Welding and Inspection Tests 105
B830. Piping System Components and Fabrication Details 105
B831. Piping System Components 105
B840. Design,Installation,and Testing 105
B841. Steel Pipe 105
B842. Other Materials 106
B843. Compressor Stations 106
B844. Pipe-Type and Bottle-Type Holders 106
B850. Additional Operating and Maintenance Considerations Affecting the Safety of Sour Gas Pipelines 106
B851. Pipeline Maintenance 107
B855. Concentrations of People in Location Classes 1 and 2 107
B860. Corrosion Control of Sour Gas Pipelines 107
B861. General 107
B862. External Corrosion Control 107
B863. Internal Corrosion Control 108
B866. Stress Corrosion and Other Phenomena 108

Appendices
A. References 109
B. Numbers and Subjects of Standards and Specifications That Appear in Appendix A 112
C. Publications That Do Not Appear in the Code or Appendix A 113
D. Specified Minimum Yield Strength for Steel Pipe Commonly Used in Piping Systems 115
E. Flexibility and Stress Intensification Factors 117
F. Extruded Headers and Welded Branch Connections 123
G. Testing of Welders Limited to Work on Lines Operating at Hoop Stresses of Less Than 20% of the Specified Minimum Yield Strength 128
H. Flattening Test for Pipe 129
I. End Preparations for Butt welding 130
J. Commonly Used Conversion Factors 137
K. Criteria for Cathodic Protection 141
L. Determination of Remaining Strength of Corroded Pipe 143
M. Gas Leakage Control Criteria 144
N. Recommended Practice for Hydrostatic Testing of Pipelines in Place 151
O. Preparation of Technical Inquiries to the ASME Code for Pressure Piping, B31 153
P. Nomenclature for Figures 154
Q. Scope Diagrams 155
R. Estimating Strain in Dents 158
Index 160

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