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ASME B31.8-2014
M00050787
New product
ASME B31.8-2014 Gas Transmission and Distribution Piping Systems
standard by ASME International, 09/30/2014
Full Description
This Code covers the design, fabrication, installation,inspection, and testing of pipeline facilities usedfor the transportation of gas. This Code also covers safetyaspects of the operation and maintenance of those facilities.(See Mandatory Appendix Q for scope diagrams.)This Code is concerned only with certain safetyaspects of liquefied petroleum gases when they arevaporized and used as gaseous fuels. All of the requirementsof NFPA 58 and NFPA 59 and of this Code concerningdesign, construction, and operation andmaintenance of piping facilities shall apply to pipingsystems handling butane, propane, or mixtures of thesegases.
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ASME B31.8-2014
(Revision of ASME B31.8-2012)
Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN INTERNA TIONAL PIPING C ODE ®
ASME B31.8-2014
(Revision of ASME B31.8-2012)
ASME B31.8-2014
(Revision of ASME B31.8-2012)
Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN INTERNA TIONAL PIPING C ODE ®
Two Park Avenue • New York, NY • 10016 USA
Date of Issuance: September 30, 2014
The next edition of this Code is scheduled for publication in 2016. This Code will become effective 6 months after the Date of Issuance.
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The American Society of Mechanical Engineers Two Park Avenue, New York, NY 10016-5990
Copyright © 2014 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 6
806 | Quality Assurance ...................................... | 12 |
807 | Training and Qualification of Personnel .................. | 12 |
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 |
Table | ||
817.1.3-1 | Tensile Testing .......................................... | 17 |
Chapter II | Welding ................................................. | 19 |
820 | Welding ................................................ | 19 |
821 | General ................................................. | 19 |
822 | Preparation for Welding ................................. | 19 |
823 | Qualification of Procedures and Welders ................. | 19 |
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 | Piping System Components and Fabrication Details ...... | 23 |
831 | Piping System Components ............................. | 23 |
832 | Expansion and Flexibility ............................... | 30 |
833 | Design for Longitudinal Stress ........................... | 31 |
834 | Supports and Anchorage for Exposed Piping ............ | 33 |
835 | Anchorage for Buried Piping ............................ | 34 |
Tables | ||
831.4.2-1 832.2-1 | Reinforcement of Welded Branch Connections, Special Requirements ......................................... Thermal Expansion or Contraction of Piping Materials ............................................. | 28 30 |
iii
832.5-1 | Modulus of Elasticity for Carbon and Low Alloy Steel ................................................. | 31 |
Chapter IV | Design, Installation, and Testing .......................... | 35 |
840 | Design, Installation, and Testing ......................... | 35 |
841 | Steel Pipe ............................................... | 37 |
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 |
Tables | ||
841.1.6-1 | Basic Design Factor, F ................................... | 39 |
841.1.6-2 | Design Factors for Steel Pipe Construction ............... | 40 |
841.1.7-1 | Longitudinal Joint Factor, E ............................. | 41 |
841.1.8-1 | Temperature Derating Factor, T, for Steel Pipe ........... | 41 |
841.1.11-1 | Pipeline Cover Requirements ............................ | 43 |
841.2.3-1 | Pipeline Field Cold Bend Requirements .................. | 45 |
841.3.2-1 | 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 ......... | 49 |
841.3.3-1 | Maximum Hoop Stress Permissible During an Air or Gas Test .................................................. | 50 |
842.1.1-1 | Standard Thickness Selection Table for Ductile Iron Pipe ............................................. | 52 |
842.2.2-1 | Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe ................................... | 54 |
842.2.3-1 | Diameter and Wall Thickness for Reinforced Thermosetting Plastic Pipe ............................ | 54 |
842.2.9-1 | Nominal Values for Coefficients of Thermal Expansion of Thermoplastic Pipe Materials ....................... | 56 |
844.3-1 | Design Factors, F ....................................... | 62 |
844.3-2 | Minimum Clearance Between Containers and Fenced Boundaries ........................................... | 62 |
845.2.2-1 | Maximum Allowable Operating Pressure for Steel or Plastic Pipelines or Mains ............................. | 64 |
845.2.3-1 | Maximum Allowable Operating Pressure for Pipelines Operating at 100 psig (690 kPa) or More ............... | 64 |
845.2.3-2 | Maximum Allowable Operating Pressure for Pipelines Operating at Less Than 100 psig (690 kPa) ............ | 64 |
Chapter V | Operating and Maintenance Procedures.................... | 75 |
850 | Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities .............................................. | 75 |
851 | Pipeline Maintenance ................................... | 77 |
852 | Distribution Piping Maintenance ........................ | 83 |
853 | Miscellaneous Facilities Maintenance .................... | 86 |
854 | Location Class and Changes in Number of Buildings Intended for Human Occupancy ...................... | 89 |
855 | Pipeline Service Conversions ............................ | 91 |
856 | Odorization ............................................. | 91 |
857 | Uprating ................................................ | 92 |
iv
Figure
851.4.1-1 Allowable Ripple Heights 80
Tables
851.4.4-1 Wall Thickness for Unlikely Occurrence of
Burn-Through 81
854.1-1 Location Class 90
857.4-1 Wall Thickness Allowance for Uprating a Ductile Iron
High-Pressure Main or System 94
Chapter VI Corrosion Control 95
Corrosion Control — General 95
External Corrosion Control for Steel Pipelines 96
Cathodic Protection Criteria 98
Operation and Maintenance of Cathodic Protection
Systems 98
Internal Corrosion Control 98
Steel Pipelines in Arctic Environments 99
Steel Pipelines in High-Temperature Service 100
Stress Corrosion and Other Phenomena 101
Cast Iron, Wrought Iron, Ductile Iron, and Other Metallic Pipelines 101
Chapter VII Intentionally Left Blank 102
Chapter VIII Offshore Gas Transmission 103
A800 Offshore Gas Transmission 103
A801 General 103
A802 Scope and Intent 103
A803 Offshore Gas Transmission Terms and Definitions 103
A811 Qualification of Materials and Equipment 104
A814 Material Specifications 104
A817 Conditions for the Reuse and Requalification of Pipe 105
A820 Welding Offshore Pipelines 105
A821 General 105
A823 Qualification of Procedures and Welders 105
A825 Stress Relieving 106
A826 Inspection of Welds 106
A830 Piping System Components and Fabrication Details 106
A831 Piping System Components 106
A832 Expansion and Flexibility 106
A834 Supports and Anchorage for Exposed Piping 106
A835 Anchorage for Buried Piping 106
A840 Design, Installation, and Testing 107
A841 Design Considerations 107
A842 Strength Considerations 108
A843 Compressor Stations 111
A844 On-Bottom Stability 112
A846 Valves 113
A847 Testing 113
A850 Operating and Maintenance Procedures Affecting the
Safety of Gas Transmission Facilities 114
A851 Pipeline Maintenance 114
A854 Location Class 115
A860 Corrosion Control of Offshore Pipelines 115
A861 External Corrosion Control 115
A862 Cathodic Protection Criteria 117
A864 Internal Corrosion Control 117
v
Table A842.2.2-1 | Design Factors for Offshore Pipelines, Platform | |
Piping, and Pipeline Risers ............................ | 109 | |
Chapter IX | Sour Gas Service ......................................... | 118 |
B800 | Sour Gas Service ........................................ | 118 |
B801 | General ................................................. | 118 |
B802 | Scope and Intent ........................................ | 118 |
B803 |