PERMAFROST PIPELINING - Conclusion: Instrumentation yields geotechnical picture of slope movements along northern Canadian pipeline

Inertial pigging of a short section on the 323-mm (12 in. nominal) OD Norman Wells crude oil pipeline from Norman Wells, NWT, to Zama, Alta., revealed the line had experienced an increase in internal diameter, suggesting a localized wrinkle.Enbridge Pipelines (NW) Inc., Edmonton, owns and operates the buried oil pipeline, which operates at ambient temperatures. Built in 1985, it is the first fully buried pipeline in discontinuous permafrost in North America.Part 1 (OGJ, May 14, p. 62) of this two-part series provides a full discussion of the background of the problem and the resulting remediation program. This concluding article focuses on the instrumentation at the site and what was lear...

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