This paper presents failure analysis performed to investigate thinning observed in bank tubes of a package boiler. Thorough investigation using visual inspection, chemical analyses, metallographic examinations and mechanical testing showed that the bank tubes failed by flow assisted corrosion. The bank tubes were fabricated of carbon steel UNS K01200 and had been in service for 12 years. Failure contributing factors as well as corrective actions are discussed in order to avoid reoccurrence of erosion corrosion.

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