Enbridge SCC Management Program

1
Enbridge SCC Management Program

• SCC Workshop
• Houston - December 2, 2003
• Walter Kresic
• Enbridge Pipelines Inc.

2
System Map
Pipeline System
Norman Wells
540 Miles
591 Miles
Athabasca
Line 1
1098 Miles
Line 2
800 Miles
Line 3
1098 Miles
Line 4
1098 Miles
Line 5
645 Miles
Line 9
Line 9
Line 6
759 Miles
Line 7
153 Miles
Line 8
130 Miles
Line 9
524 Miles
Line 10
91 Miles
Line 11
47 Miles
Line 13
909 Miles
Line 14
461 Miles
Line 17
88 Miles
Vector
348 Miles
3
Condition Monitoring
CEPA Framework
Plan Implement Mitigation
Document Learn
4
Condition Monitoring

• Pipeline segment susceptibility inventory
• coating type / disbondment observations
• field examinations whenever pipe exposed
• crack ILI data
• hydrotest results when available

5
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)

6
Document and Learn

• Annual update of technical process
• databasing significant volume of information
• on-going trend process
• share with industry

7
SCC Detected by ILI
8
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

9
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

10
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

11
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

12
Enbridge SCC Management Program

• SCC Workshop
• Houston - December 2, 2003
• Walter Kresic
• Enbridge Pipelines Inc.