Gas Transmission Pipelines

1. Gas Transmission Pipelines ENGINEERING SERVICES LP HOUSTON, TEXAS Engineering Specification

2. 1.0 SCOPE Operation/Maintenance of Gas Transmission Piping Systems Design Fabrication Installation Inspection Testing Safety Gas Transmission Pipelines

3. Gas Transmission Pipelines Intent Provide engineering specifications for safe construction, opera-tion, maintenance, and inspection of gas transmission piping systems. Shall meet or exceed ASME/ANSI B31.8 and DOT 49CFR192.

4. Gas Transmission Pipelines • Exclusions • Design and fabrication of pressure vessels covered by ASME BPV Code • Piping with metal temperatures above 450oF or below -20oF • Design and manufacture of proprietary items of equipment, apparatus, or instruments • Hazardous liquid pipelines (B31.4)

5. Gas Transmission Pipelines 3.0 PIPING SYSTEMS DEFINITIONS • General Terms • Piping Systems • Pressure Relief • Valves

6. Gas Transmission Pipelines • Piping Systems Component Definitions • Pipe and Piping Terms • Dimensional Terms • Mechanical Properties • Carbon Steel Pipe • Pipe Manufacturing Processes

7. Gas Transmission Pipelines 4.0 Design, Fabrication, Operation, and Testing Terms • LOCATION CLASS • Uprating • Pressure Terms • Temperature Terms • Stress Terms

8. Gas Transmission Pipelines 5.0 MATERIALS AND EQUIPMENT • Qualifications of Materials and Equipment • Marking • Material Specifications - Steel Pipe • Equipment Specifications • Transportation of Line Pipe • Conditions for the Reuse of Line Pipe

9. Gas Transmission Pipelines 6.0 WELDING • Welding Terms • Preparation for Welding • Butt Welds • Fillet Welds • Seal Welds

10. Gas Transmission Pipelines • Qualification of Procedures and Welders • Requirements for Piping Systems Operating at Hoop Stresses Less Than 20% SMYS • Requirements for Piping Systems Operating at Hoop Stresses More Than 20% SMYS • Variables Requiring Separate Qualification of Welding Procedures and Welders • Welder Requalification Requirements • Qualification Records

11. Gas Transmission Pipelines • Preheating and Stress Relieving • Preheating • Stress Relieving • Maximum carbon or carbon equivalent • Thickness • Dissimilar materials • Fillet and groove weld limitations • Stress Relieving Temperatures • Methods of Stress Relieving • Equipment for Local Stress Relieving

12. Gas Transmission Pipelines • Welding and Inspection Tests • Inspection of Welds on Piping Systems Intended to Operate at Less Than 20% SMYS • Inspection and Tests for Quality Control of Welds on Piping Systems Intended to Operate at 20% or more of SMYS • Repair or removal of defective welds in piping intended to operate at 20% or more of SMYS

13. Gas Transmission Pipelines 7.0 PIPING SYSTEM COMPONENTS AND FABRICATION DETAILS • Valves and pressure reducing devices • Flanges • Standard fittings • Branch connections • Special connections fabricated by welding • Closures

14. Gas Transmission Pipelines • Reinforcement of Welded Branch Connections • General requirements • Special requirements • Reinforcement of Multiple Openings • Extruded Outlets

15. Gas Transmission Pipelines • Expansion and Flexibility • Amount of expansion • Flexibility requirements • Combined Stress Calculations • Supports and Anchors for Above Ground Piping • Supports and Anchors for Buried Piping

16. Gas Transmission Pipelines 8.0 DESIGN, INSTALLATION, AND TESTING • Steel Pipe Design Formula • Limitations on Design Pressure, P • Limitations on Specified Minimum Yield Strength • Additional Requirements for Wall Thickness, t • Design Factors, F, and Location Classes • Fabricated Assemblies & Pipelines on Bridges • Cover, Clearance, and Casing Requirements

17. Gas Transmission Pipelines • Installation of Steel Pipelines • Construction Specifications • Inspection Provisions • Bends, Elbows, and Miters in Steel Pipelines • Pipe Surface Requirements for Pipe to Operate at 20% or more of SMYS • Detection and repair of gouges, grooves, dents, and arc burns

18. Gas Transmission Pipelines • Miscellaneous Construction Operations • Handling, hauling,and stringing pipe joints • Installation of pipe in the ditch • Backfilling • Preventing combusible gas-air mixture in the pipeline • Welding with gas in the pipeline • Purging of pipelines

19. Gas Transmission Pipelines • Testing After Pipeline Construction • Two (2) hour strength test at 1.5 times design pressure • Test pressures versus Location Classes • Leak testing after construction • Safety During Tests

20. Gas Transmission Pipelines • Compressor Station Equipment • Design • Electrical Facilities • Compressor Station Equipment • Safety Devices • Pressure Limiting Devices • Explosion Prevention

21. Gas Transmission Pipelines • Compressor Station Piping • Gas Piping • Specifications for gas piping • Installation • Testing • Identification of valves and piping • Piping design codes - Fuel gas, air, lubricating oil, water, steam, and hydraulic.

22. Gas Transmission Pipelines • Control and Limiting of Gas Pressure • Requirements for Design of Pressure Relief and Pressure Limiting Stations • Capacity of Pressure Relieving and Pressure Limiting Stations and Devices • Required capacity • Proof of adequate capacity and satisfactory performance of pressure limiting and pressure relief devices • Uprating

23. Gas Transmission Pipelines 8.5 Valves • Required spacing of gas transmission pipeline valves • Location of gas transmission pipeline valves • Vaults (Valve Boxes) • Structural design requirements • Accessibility • Vault Sealing, Venting, and Ventilation • Drainage and Waterproofing

24. Gas Transmission Pipelines 9.0 OPERATING AND MAINTENANCE PROCEDURES • Basic Requirements • Essential Features of the Operating and Maintenance Plan • Essential Features of the Emergency Plan • Pipeline Failure Investigation • Prevention of Accidental Ignition • Blasting Effects

25. Gas Transmission Pipelines 9.2 PIPELINE MAINTENANCE • Continuing Surveillance of Pipelines • Pipeline Patrolling • Leak Surveys • Permanent Repair Procedures for Injurious Gouges, Grooves, Dents, Welding Defects, Leaks, and Nonleaking Corroded Areas • Testing Repairs and Replacement Pipe Sections

26. Gas Transmission Pipelines • PIPELINE MAINTENANCE (Continued) • Nondestructive Testing of Repairs, Gouges, Grooves, Dents, and Welds • Pipeline Leak Records • Pipeline Markers • Abandoning of Transmission Facilities • Repositioning a Pipeline in Service

27. Gas Transmission Pipelines • Miscellaneous Facilities Maintenance • Compressor Station Maintenance • Inspection and testing of relief valves • Repairs to compressor station piping • Maintenance of Pressure Limiting and Pressure Regulating Stations • Emergency valve inspection procedures • Valve records • Prevention of accidental operation

28. Gas Transmission Pipelines • Pipeline Service Conversions • Historical Records Study • Requirements for Conversion to Gas Service • Conversion Procedure • Records of the Conversion

29. Gas Transmission Pipelines 10.0 CORROSION CONTROL • External • Internal • Pipelines in High Temperature Service • Stress Corrosion and Other Phenomena • Records • Expanded corrosion control presentation is a part of three (3) other training programs.