Abstract
A buried carbon steel gas flowline suffered from accelerated external corrosion after one-year operation. The flowline was protected by an impressed current cathodic protection and liquid epoxy polymer coating system. Root cause analysis revealed that coal seam oxidation under wet condition generated an aggressive acidic soil environment around the pipe. The coating and cathodic protection system in a low pH and elevated temperature (90-110°C) environment was not able to provide adequate protection from external corrosion for this flowline.
Subject
Acids,
Sulfur,
Pipe surfaces,
Seams,
Water,
Coatings,
Piping,
Cathodic protection,
Acidity,
Flowlines,
Coal,
Coating defects,
Soil
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2009
Association for Materials Protection and Performance (AMPP)
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