March 2012, Vol. 239 No. 3


Localized Corrosion In Condensate Transfer Pipeline

After four years of intermittent operation, a pipeline transferring condensate to an export tank experienced a leak at one of its elbows. Circumferential welds had no relation to the problem elbow. It was concluded that localized pitting corrosion, induced at the 6 o’clock position on the inner surface of the pipe’s elbow, was the main failure mechanism. The lower level of the pipe’s elbow, together with the existence of water inside the pipe, provided the condition most suitable for a build-up of concentration cells, particularly during operational outages, when stagnant or no-flow conditions existed. The problem was solved by replacing the failed elbow with

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