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07564 FCCU Light Ends Plant Carbonate Stress Corrosion Cracking Experience

As a result of a Carbonate Stress Corrosion Cracking (CSCC) event at one refinery an investigation was made into the cause and mitigation of CSCC. This paper outlines the information obtained and the development of tools that could be utilized by other refinery fluidized catalytic cracker units (FCCU's) to better assess risk of CSCC.

Product Number: 51300-07564-SG
ISBN: 07564 2007 CP
Author: Douglas J. Milton, Chris G. Smalley, Robert I. Botto, William T. Bresnahan, and Bill Zagrany
Publication Date: 2007
Industry: Petroleum Refining
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As a result of a Carbonate Stress Corrosion Cracking (CSCC) event at one refinery an investigation was made into the cause and mitigation of CSCC. At the specific refinery, the immediate cause was attributed to a change in catalyst type in the upstream cat cracker feed hydrotreater (CFHT) which reduced the feed sulfur/feed nitrogen (S/N) ratio in the feed, resulting in an increased carbonate concentration, and an increased likelihood of cracking. This paper outlines the information that was developed during the investigation and also outlines the development of tools that could be utilized by other refinery fluidized catalytic cracker units (FCCU's) to better assess risk of CSCC.

Key Words: FCCU, Fluid Catalytic Cracking, Carbonate, Stress Corrosion Cracking, Alkaline Stress Corrosion Cracking, SCC

 

As a result of a Carbonate Stress Corrosion Cracking (CSCC) event at one refinery an investigation was made into the cause and mitigation of CSCC. At the specific refinery, the immediate cause was attributed to a change in catalyst type in the upstream cat cracker feed hydrotreater (CFHT) which reduced the feed sulfur/feed nitrogen (S/N) ratio in the feed, resulting in an increased carbonate concentration, and an increased likelihood of cracking. This paper outlines the information that was developed during the investigation and also outlines the development of tools that could be utilized by other refinery fluidized catalytic cracker units (FCCU's) to better assess risk of CSCC.

Key Words: FCCU, Fluid Catalytic Cracking, Carbonate, Stress Corrosion Cracking, Alkaline Stress Corrosion Cracking, SCC

 

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