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

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Stress Corrosion Cracking (SCC)

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Stress corrosion cracking scc

Stress Corrosion Cracking (SCC)

Josef Kopec, P.Eng.


First scc inquiry

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

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

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

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

NEB SCC Liaison Group

  • Industry Groups and Regulators

  • Monitor progress of implementation of recommendations

  • SCC research - funding

  • CEPA/CAPP SCC database & trending


Ongoing activities

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

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

  • note: physical inspection


Significant scc reported december 2003

Significant SCC Reported(December, 2003)

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


Plans and priorities scc integrity issues

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

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

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 of Integrity Issues

  • Management system audits

  • Require companies to perform Engineering Assessments

  • Information sharing with other Regulators and Industry

    • meetings

    • conferences


Common goal

Common Goal

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


Copies of scc inquiry report

Copies of SCC Inquiry Report

Regulatory Support Office

National Energy Board

(403) 292-4800


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