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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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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

  • 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


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


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


NEB SCC Liaison Group

  • Industry Groups and Regulators

  • Monitor progress of implementation of recommendations

  • SCC research - funding

  • CEPA/CAPP SCC database & trending


Ongoing activities

  • Qualitative Risk Ranking of Companies SCC Susceptibility

  • SCC Management Plan Updates (1999)

  • Company Meetings

  • NEB SCC Liaison Group


Canadian Energy Pipeline Association (CEPA) 2000 SCC Database Trending Report Results

  • note: physical inspection


Significant SCC Reported(December, 2003)

Significant SCC reported to the NEB as per the requirements of Inquiry report


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


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.)


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


Management of Integrity Issues

  • Management system audits

  • Require companies to perform Engineering Assessments

  • Information sharing with other Regulators and Industry

    • meetings

    • conferences


Common Goal

  • NEB regulated facilities and activities are safe and perceived to be safe


Copies of SCC Inquiry Report

Regulatory Support Office

National Energy Board

(403) 292-4800


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