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Enbridge SCC Management Program
SCC Workshop
Houston - December 2, 2003Walter Kresic
Enbridge Pipelines Inc.
SCC Workshop
Houston - December 2, 2003Walter Kresic
Enbridge Pipelines Inc.
System Map
Buffalo
Chicago ToledoMokena
Sarnia
Toronto
Montreal
Superior
Gretna
Regina
Cromer
Edmonton
Hardisty
Kerrobert
Norman Wells
Zama
Clearbrook
FortMcMurray
Norman WellsAthabascaLine 1Line 2Line 3Line 4Line 5Line 6Line 7
Line 9Line 10Line 11Line 13Line 14Line 17Vector
540 Miles591 Miles
1098 Miles800 Miles
1098 Miles1098 Miles
645 Miles759 Miles153 Miles
524 Miles91 Miles47 Miles
909 Miles461 Miles88 Miles
348 Miles
Pipeline System
Line 9Line 9
Line 8 130 Miles
Initialsusceptibilityassessment
Potentiallysusceptible to SCC?
Estimateconsequences,prioritize and
implement fieldinvestigations
Is SCC present?
Is significantSCC present?
EstimateConsequences
and prioritize formitigation
Select mitigation
Schedule and implement mitigation
Is routinemitigation required?
Documentand learn
No
NoPeriodic monitoring
No
NoYes
Yes
Yes or No
Yes
Yes Condition Monitoring
Plan & Implement Mitigation
Document & Learn
CEPA Framework
Condition Monitoring
• Pipeline segment susceptibility inventory– coating type / disbondment observations– field examinations whenever pipe exposed– crack ILI data– hydrotest results when available
Plan and Implement Mitigation
• Mitigation of discrete pipe joint– addresses isolated SCC colonies– grinding, sleeving, recoating
• Mitigation of entire pipe segment– ILI-based repair project for widespread
colonies – hydrotest is an option– pressure spectrum modification? (PRCI)
Document and Learn
• Annual update of technical process– databasing significant volume of information– on-going trend process– share with industry
SCC Detected by ILI
Documented Process
• Roles and responsibilities• Annual plans and budgets• Technical procedures– Field NDT– Pressure restriction during field work– Grinding / Sleeving / Coating Specifications– Gathering samples and field observations– Annual trending techniques
Enbridge SCC Observations
• No failures have occurred• Near neutral pH SCC • Associated with disbonded P.E. tape• Pressure cycling a potential contributor• Crack detection ILI is effective
Improvements
• Field NDT process (i.e. reporting styles)• NDT depth sizing • Fitness-for-purpose equations• Crack tool defect sizing precision• Crack initiation and growth lifecycle
understanding
Summary
• Enbridge SCC Management Program is a component of a broader crack program applied to all pipe
• Techniques and technologies exist but greater precision desirable
Enbridge SCC Management Program
SCC Workshop
Houston - December 2, 2003Walter Kresic
Enbridge Pipelines Inc.
SCC Workshop
Houston - December 2, 2003Walter Kresic
Enbridge Pipelines Inc.