Stress Corrosion Stress Corrosion Cracking (SCC)Cracking (SCC)

Josef Kopec, P.Eng.

First SCC InquiryFirst 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 Inquiry Report Recommendations in 6 Key Recommendations in 6 Key

AreasAreas

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 InquiryPost-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 GroupNEB SCC Liaison Group

Industry Groups and Regulators

Monitor progress of implementation of recommendations

SCC research - funding

CEPA/CAPP SCC database & trending

Ongoing activitiesOngoing activities

Qualitative Risk Ranking of Companies SCC Susceptibility

SCC Management Plan Updates (1999)

Company Meetings

NEB SCC Liaison Group

Fluid Length Inspected (m)

No. SCC Colonies Detected

Gas 125,855 17,925

Liquid 20,532 366

Total 146,387 18,291

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

note: physical inspection

Significant SCC ReportedSignificant SCC Reported(December, 2003)(December, 2003)

Fluid Significant SCC Reported

Oil 9 Gas 350

TOTAL 359

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

Plans and Priorities -Plans and Priorities -SCC Integrity IssuesSCC Integrity Issues

Continue to meet with companies

Continue to monitor incidents of SCC

Integrate SCC Management with Integrity Management Plan audits

SCC in SCC in PerspectivePerspective

(17%)

(19%)

(23%)

(25%)

(16%)

Causes of in-service pipeline ruptures: 1985-95

General Corrosion Other

SCC

(Geotechnical landslides, etc.)

Contact Damage (contact by earth moving equipment, etc.)

On-going Integrity IssuesOn-going Integrity Issues

SCC is one of many time dependent integrity concerns

On going monitoring of: ERW seam problemCorrosion -

General, Narrow Axial External Corrosion, Corrosion Fatigue

Hard Spots

Management of Integrity Management of Integrity IssuesIssues

Management system audits Require companies to perform Engineering

Assessments Information sharing with other Regulators and

Industrymeetingsconferences

Common GoalCommon Goal

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

Copies of SCC Inquiry ReportCopies of SCC Inquiry Report

Regulatory Support Office

National Energy Board

(403) 292-4800