This paper highlights several cases where alkaline-carbonate stress corrosion cracking (ACSCC) occurred in atypical locations, including a cold wall Fluid Catalytic Cracking (FCC) Unit regenerator, sour water stripper (SWS) pumparound piping, SWS ammonia acid gas knockout piping, and a mercaptan oxidation unit. These unusual failure locations highlight the need for a fundamental understanding of the ACSCC mechanism. This paper discusses work done to monitor on-going ACSCC risks through sour water sampling, chemical analysis, and ionic modeling.

Subject
Water, Piping, Alkalinity, Refineries, Fluid catalytic cracking, Acidity, Sour water, Mechanical failure, Carbonate cracking, Sulfides, Carbonate stress corrosion cracking, Caustic stress corrosion cracking, Samples
Keywords:
ACSCC, SCC, carbonate cracking, sour water, sour water stripper, mercaptan oxidation, FCC
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2017
Association for Materials Protection and Performance (AMPP)
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