In this paper a general description of aboveground storage tank (AST) foundations and corrosion mitigation technques to provide long term service is presented. Case studies involving earth foundation, soil corrosion, and double bottom tank are provided. The case studies apply standard electrochemical and failure analysis techniques to determine the primary causes and modes of failures. Soil chemistry, Microbiologically Induced Corrosion (MIC), pH and presence of chlorides in the soil will provide evidence for accelerated corrosion if there is deficiency in cathodic protection. Soil chemistry can be used to predict the pentration due to corrosion attack. If air traps or shielding is present, localized corrosion attack will take place in corrosive soil. Concrete foundations and corrosion inhibitors may be considered in corrosive conditions.

Subject
Corrosion prevention, Cathodic protection, Sand, Photography, Reference electrodes, Soil resistivity, Inspection, Thickness loss, Corrosion products, Aboveground storage tanks, Corrosion protection, Tank bottoms, Soil
Keywords:
Corrosion Protection, AST, Vapor Phase Corrosion Inhibitor (VCI), Failure Mechanism, Cathodic Protection, Concrete Foundations, Double Bottom Tanks
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2019
Association for Materials Protection and Performance (AMPP)
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