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09065 Failure Analysis on a Buried Flowline in Elevated Temperature and Acidic Soil

Product Number: 51300-09065-SG
ISBN: 09065 2009 CP
Author: Muhdi Sujatmiko and Wei Chu
Publication Date: 2009
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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 (90-110ºC) environment was not able to provide adequate protection from external corrosion for this flowline.

Keywords: coal seam, soil acidification, elevated temperature, cathodic protection, liquid epoxy polymer coating
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 (90-110ºC) environment was not able to provide adequate protection from external corrosion for this flowline.

Keywords: coal seam, soil acidification, elevated temperature, cathodic protection, liquid epoxy polymer coating
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