This paper first reviews laboratory and field investigations of top-of-line corrosion. A particular oxygen contaminated, wet gathering pipeline is described which experienced severe corrosion in the vapor zone. Pigging could not be accomplished, therefore a corrosion inhibitor with oxygen tolerance and vapor space capability was applied.

Corrosion in the line was subsequently monitored with coupons, ultrasonic thickness measurements and periodic visual inspection. Corrosion inhibitor was detected in gas samples pulled from the line. All indicators pointed to adequate corrosion control in this pipeline even though operated in the same regime as before.

Subject
Water, Piping, Corrosion rate, Thickness measurement, Pipelines, Tolerances, Vapors, Corrosion inhibitors, Steel, Oxygen, Corrosion protection, Methanol, Corrosion coupons
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2009
Association for Materials Protection and Performance (AMPP)
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