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Title: When is corrosion not corrosion? A decade of MFL pipeline inpection
Category: Technical papers from Pipes & Pipelines International
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 817
Date of Publication: December 2002
Price: $25.00 US
Authors: Paul Tims, and Owen Wilson
Abstract: TOTALFINAELF Exploration UK (TFEEUK), as the technical operator of the twin 32-in Frigg gas export pipelines between the Frigg field and the St Fergus gas terminal, regularly inspects the pipelines with intelligent pigs to demonstrate their integrity. Inspections of one of these pipelines found several significant defects that appeared to grow over time, to the point where the pressure at which the pipeline could safely be operated required to be reduced. To restore the pressure-retaining capability of the pipeline to its design level, a section of pipeline was replaced and a sample containing the pressure-limiting defects was recovered to the surface. A physical survey of the corroded pipe joints discovered that the reported corrosion was not present, but found instead a layer of ferrous debris adhering to the pipe wall. The interpretation of the debris as corrosion highlights the limitations of using an inferred inspection technique in an environment where no complementary inspection is practicable. TFEEUK continues regularly to inspect these pipelines using intelligent pigs, to demonstrate their integrity.
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