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.