Stress Corrosion Cracking SCC

1
Stress Corrosion Cracking (SCC)

• Josef Kopec, P.Eng.

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First SCC Inquiry

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

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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

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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

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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

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NEB SCC Liaison Group

• Industry Groups and Regulators
• Monitor progress of implementation of
  recommendations
• SCC research - funding
• CEPA/CAPP SCC database trending

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Ongoing activities

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

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

• note physical inspection

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

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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.)
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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

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Management of Integrity Issues

• Management system audits
• Require companies to perform Engineering
  Assessments
• Information sharing with other Regulators and
  Industry
• meetings
• conferences

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Common Goal

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

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Copies of SCC Inquiry Report

• Regulatory Support Office
• National Energy Board
• [phone]