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

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

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

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

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

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

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

8. Canadian Energy Pipeline Association (CEPA) 2000 SCC Database Trending Report Results n 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 n Continue to meet with companies n Continue to monitor incidents of SCC n Integrate SCC Management with Integrity Management Plan audits

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

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

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

14. Common Goal n 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