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51317--9596-Carbonate SCC Experiences in Unusual Locations

Cases where alkaline-carbonate stress corrosion cracking (ACSCC) occurred, including a cold wall Fluid Catalytic Cracking (FCC) Unit regenerator and a mercaptan oxidation unit. This paper discusses work done to monitor on-going ACSCC risks through sour water sampling, chemical analysis, and ionic modeling.

Product Number: 51317--9596-SG
ISBN: 9596 2017 CP
Author: Jeremy Nelson
Publication Date: 2017
Industry: Petroleum Refining
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Typically alkaline carbonate stress corrosion cracking (ACSCC) is associated with fluid catalytic cracking unit (FCCU) sour water streams. While it has been recognized that ACSCC risks exist outside FCC sour water services there have been few published cases of ACSCC in other locations. This paper highlights several cases where ACSCC occurred in atypical locations including a cold wall FCC regenerator sour water stripper (SWS) pumparound SWS ammonia acid gas knockout 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.

Keywords: ACSCC, SCC, carbonate cracking, sour water, sour water stripper, mercaptan oxidation, FCC

Typically alkaline carbonate stress corrosion cracking (ACSCC) is associated with fluid catalytic cracking unit (FCCU) sour water streams. While it has been recognized that ACSCC risks exist outside FCC sour water services there have been few published cases of ACSCC in other locations. This paper highlights several cases where ACSCC occurred in atypical locations including a cold wall FCC regenerator sour water stripper (SWS) pumparound SWS ammonia acid gas knockout 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.

Keywords: ACSCC, SCC, carbonate cracking, sour water, sour water stripper, mercaptan oxidation, FCC

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