Historical inspections of atmospheric storage tanks in a major onshore Oil and Gas terminal identified underside floor corrosion. Investigations suggested that the corrosion was likely caused by a number of factors, namely, issues with the cathodic protection (CP) system and water ingress. Based on previous experience gained from atmospheric storage tanks inspection of similar design, a decision was taken to act on this matter.

The intent of this paper is to share learnings and observations on how potential damages were flagged, repaired and/or mitigated, including improvements made at site to ensure repeat issues do not occur, maintenance costs are reduced, and reliability is maintained for long-term utilization

Subject
Water, Materials, Perforation, Cathodic protection, Corrosion rate, Inspection, Metal loss, Repair, Storage tanks, Corrosion protection, Tank bottoms, Soil, Voids
Keywords:
tanks, cathodic protection, voids, subsidence, vapor corrosion inhibitor (VCI)
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2022
Association for Materials Protection and Performance (AMPP)
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