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ASME B31.8-2012
M00050790
New product
ASME B31.8-2012 Gas Transmission and Distribution Piping Systems
standard by ASME International, 01/04/2013
Full Description
This Code prescribes comprehensive solutions for materials, design, fabrication, assembly, erection, testing and inspection. It also serves as a companion to ASME's other B31 codes on piping systems. Together, they remain essential references for anyone engaged with piping.In stock
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Gas Transmission and Distribution Piping Systems
ASME Code for Pressure Piping, B31
AN A MERICAN NA TIONAL S T AND ARD
ASME B31.8-2012
(Revision of ASME B31.8-2010)
ASME B31.8-2012
(Revision of ASME B31.8-2010)
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 USA
Date of Issuance: January 4, 2013
The next edition of this Code is scheduled for publication in 2014. This Code will become effective 6 months after the Date of Issuance.
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The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990
Copyright © 2013 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
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 | |
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 | |
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 | |
830 | Piping System Components and Fabrication Details ...... | 23 |
831 | Piping System Components ............................. | 23 |
832 | Expansion and Flexibility ............................... | 29 |
833 | Design for Longitudinal Stress ........................... | 30 |
834 | Supports and Anchorage for Exposed Piping ............ | 33 |
835 | Anchorage for Buried Piping ............................ | 33 |
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 | |
840 | Design, Installation, and Testing ......................... | 35 |
841 | Steel Pipe ............................................... | 37 |
842 | Other Materials ......................................... | 50 |
843 | Compressor Stations .................................... | 58 |
844 | Pipe-Type and Bottle-Type Holders ...................... | 61 |
845 | Control and Limiting of Gas Pressure .................... | 62 |
846 | Valves .................................................. | 67 |
847 | Vaults .................................................. | 68 |
848 | Customers’ Meters and Regulators ...................... | 69 |
849 | Gas Service Lines ....................................... | 70 |
Tables | ||
841.1.6-1 | Basic Design Factor, F ................................... | 40 |
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 .................. | 44 |
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 ......... | 48 |
841.3.3-1 | Maximum Hoop Stress Permissible During an Air or Gas Test .................................................. | 49 |
842.1.1-1 | Standard Thickness Selection Table for Ductile Iron Pipe ............................................. | 51 |
842.2.2-1 | Wall Thickness and Standard Dimension Ratio for Thermoplastic Pipe ................................... | 53 |
842.2.3-1 | Diameter and Wall Thickness for Reinforced Thermosetting Plastic Pipe ............................ | 53 |
842.2.9-1 | Nominal Values for Coefficients of Thermal Expansion of Thermoplastic Pipe Materials ....................... | 55 |
844.3-1 | Design Factors, F ....................................... | 61 |
844.3-2 | Minimum Clearance Between Containers and Fenced Boundaries ........................................... | 61 |
845.2.2-1 | Maximum Allowable Operating Pressure for Steel or Plastic Pipelines or Mains ............................. | 62 |
845.2.3-1 | Maximum Allowable Operating Pressure for Pipelines Operating at 100 psig (690 kPa) or More ............... | 63 |
845.2.3-2 | Maximum Allowable Operating Pressure for Pipelines Operating at Less Than 100 psig (690 kPa) ............ | 63 |
Chapter V | Operating and Maintenance Procedures | |
850 | Operating and Maintenance Procedures Affecting the Safety of Gas Transmission and Distribution Facilities .............................................. | 74 |
851 | Pipeline Maintenance ................................... | 76 |
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