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Stress Corrosion Cracking (SCC)

Stress Corrosion Cracking (SCC). Josef Kopec, P.Eng. First SCC Inquiry. 1985-1992 one company 5 SCC ruptures First Inquiry 1993 Considering current knowledge of SCC Concluded that SCC managed properly. SCC Inquiry 1996. Two ruptures in 1995

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Stress Corrosion Cracking (SCC)

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  1. Stress Corrosion Cracking (SCC) Josef Kopec, P.Eng.

  2. First SCC Inquiry • 1985-1992 one company 5 SCC ruptures • First Inquiry 1993 • Considering current knowledge of SCC • Concluded that SCC managed properly

  3. SCC Inquiry 1996 • Two ruptures in 1995 • Evidence SCC widespread on both gas and liquid pipelines • Since 1977 - 22 failures • 12 ruptures, 10 leaks • Provide a forum to share SCC knowledge • Knowledge shared around world

  4. Inquiry Report Recommendations in 6 Key Areas • SCC management program for all pipelines • Changes to the design of pipelines • Continued research • Establishment of SCC database • Improved emergency response practices • Continued information sharing

  5. Post-SCC Inquiry • SCC Inquiry Report • NEB SCC Liaison Group • Community visits • SCC Management Plans submitted by All NEB regulated companies & reviewed • Meetings with numerous companies

  6. NEB SCC Liaison Group • Industry Groups and Regulators • Monitor progress of implementation of recommendations • SCC research - funding • CEPA/CAPP SCC database & trending

  7. Ongoing activities • Qualitative Risk Ranking of Companies SCC Susceptibility • SCC Management Plan Updates (1999) • Company Meetings • NEB SCC Liaison Group

  8. Canadian Energy Pipeline Association (CEPA) 2000 SCC Database Trending Report Results • note: physical inspection

  9. Significant SCC Reported(December, 2003) Significant SCC reported to the NEB as per the requirements of Inquiry report

  10. Plans and Priorities -SCC Integrity Issues • Continue to meet with companies • Continue to monitor incidents of SCC • Integrate SCC Management with Integrity Management Plan audits

  11. SCC in Perspective Causes of in-service pipeline ruptures: 1985-95 General Corrosion Other Contact Damage (contact by earth moving equipment, etc.) SCC (Geotechnical landslides, etc.)

  12. On-going Integrity Issues • SCC is one of many time dependent integrity concerns • On going monitoring of: • ERW seam problem • Corrosion - • General, Narrow Axial External Corrosion, Corrosion Fatigue • Hard Spots

  13. Management of Integrity Issues • Management system audits • Require companies to perform Engineering Assessments • Information sharing with other Regulators and Industry • meetings • conferences

  14. Common Goal • NEB regulated facilities and activities are safe and perceived to be safe

  15. Copies of SCC Inquiry Report Regulatory Support Office National Energy Board (403) 292-4800

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