Evaluation of cathodic protection performance when applied to the external face of the bottom of aboveground storage tanks, founded in compacted soil and sand

Abstract:

The cathodic protection is a well-known technology to mitigate corrosion, widely employed in oil & gas industry. The efficiency of the cathodic protection in buried pipelines was tested and confirmed many years an d today, is the main corrosion protection technique for pipelines associated with protective coatings. The cathodic protection has also been used to protect the external face of the bottom of aboveground storage tank; however, the aboveground storage tank bottom differs from a buried pipeline in the geometry and in the base contact can also be prejudiced if the base of settlement and/or the bottom plates are irregular. In this paper, an impressed current cathodic protection system was applied in tank bottom rested in two different baes: compacted soil and sand. Irregularity of the tank bottom was considered, also including the contamination of the bottom base with produced water, as occurs when the first fail of the tank bottom induces leakages, which accelerate the corrosion process. In this way, it was possible to evaluate the efficiency of the impressed current cathodic protection system in protect the base bottom, in a situation closer to that found in the field. It was found that the cathodic protection current achieved only the parts in touch with the base of settlement and the contamination intensified the corrosion rate mainly in the areas that were not in touch with the compacted soil or the sand.


Reference:
CARDOSO, Juliana Lopes; SANTOS, Fabiano Raymundo dos; ALMEIDA, Neusvaldo Lira de; PIMENTA, Gutemberg de Souza. Evaluation of cathodic protection performance when applied to the external face of the bottom of aboveground storage tanks, founded in compacted soil and sand. In: RIO PIPELINE CONFERENCE & ESHIBITION, 2017, Rio de Janeiro. Anais… 10 p.

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