51316-7709-Case Study on Corrosion under Coating Sleeves after Strain Gauges Installed on Pipeline in Alberta

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Product Number: 51316-7709-SG

ISBN: 7709 2016 CP

Author: Michael Crutchley

Publication Date: 2016

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Michael Crutchley P.Eng.michael.crutchley@stantec.comStantec Consulting Ltd.Suite 2001 Scotia Place10060 Jasper AvenueEdmonton ABCanada T5J 3R8Darryl Stoyko Ph.D. P.Eng.Stress Engineering Services CanadaDarryl.Stoyko@stress.com#125. 12111 – 40th Street S.E.Calgary ABCanada T2Z 4E6Modifications made to a pipeline during the course of time after initial construction include the challenge of using compatible repair coatings often under less than ideal conditions for installation such as adverse weather. This means that final coating selection and application frequently occurs under severe time and opportunity constraints.This case study involves selection and application of wrap-around sleeves applied over electrical leads and strain gauges after application to the pipeline. Due to the somewhat remote location in northern Alberta supply of coating systems at short notice is constrained and this became an issue when taking advantage of a very brief window of opportunity with winter weather. Approximately a year and a half later investigative digs were conducted to determine the cause of strain gauges becoming un-serviceable. It was unexpected that significant exterior corrosion pitting was observed despite application of appropriate protective cathodic protection levels. An investigation was immediately conducted and these findings and corresponding remedial actions together with the impact of unique circumstances associated with actively moving soil on the sloped Right-Of-Way are presented.Keywords:External Corrosion Repair Coatings Shielding of Cathodic Protection Cathodic Protection Pipeline Coatings Strain Gauges on pipelines Surface Preparation of Pipelines Bell-hole Excavations Pipeline Condition Monitoring Impact of Geo-Hazards Pipelines.