FCC Sour Water Treatment Unit (with Side Reflux type) having design capacity of 22.7m³/hr. was commissioned in 1987. Ever since the increase in throughput of sour water in 1998, the Stripper experienced repeated failure of top trays made of SS316L in year 2004 (after in service for 17 years) and subsequently in 2008 & 2009.. Root cause analysis has indicated that erosion - corrosion due to Ammonium bi-sulfide (NH4HS) in the presence of hostile environment of chloride & cyanide with increase in throughput are the contributing factors for the failure. Remedial measures such as minor modification to the cold reflux piping, up gradation of metallurgy and increase in thickness of affected trays are also discussed in the paper. Access to this abstract is provided courtesy of Industeel, a supplier of alloy steels for refineries. The full paper is available through NACE. Click Here For Complete Abstract Text
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