Leak Prevention and Detection

Leak Prevention and Detection 1. Regular aerial inspections 2. Written pipeline safety informa- tion is distributed annually to neighbors, emergency officials and excavators. 811 Know whats below. Call before you dig 3. Regular patrols 4. Line markers are posted along the rights of way to identify pipeline's presence. Markers are checked annually. 5. Block valves to stop gas flow 6. Valves are inspected annually 7. Williams participates in local One-Call line locating service. 8. Leak surveys conducted annually. 9. Cathodic protection, a low-voltage electrical system that prevents corrosion L!!!!! STOP Wilams 10. Anodes 11. Meter to measure volume 9 10 12. Temperature sensor 13. Pressure sensor 14. Pipeline personnel monitor pipeline systems 24 hours a day, 7 days a week. 15. Pipe is pressure tested with water before being placed into service 16. Pipe sections replaced through normal maintenance C0000 17. Pressure tested at the mill 23 16 16 18. Extra thickness in populated areas 19. Protective coating Copyright Wiams 2010 Al nghts renerved 20. High tensile strength steel 21. In-line inspection devices are used to detect any anomalies in the pipe. (22 21 (20 18 17 22. Cleaning pigs are used to help prevent internal corrosion 23. All welds linking the pipe joints are x-rayed to ensure integrity. 3 CGSociety.org Copyright (C) Michael Hall, submitted 20 November 2010