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07564 FCCU Light Ends Plant Carbonate Stress Corrosion Cracking Experience

Picture for 07564 FCCU Light Ends Plant Carbonate Stress Corrosion Cracking Experience
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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. 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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$20.00

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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Picture for 04639 Carbonate Cracking Risk Assessment
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04639 Carbonate Cracking Risk Assessment of a FCCU Gas Plant

Product Number: 51300-04639-SG
ISBN: 04639 2004 CP
Author: Monique I. Rivera, Steven R. Bolinger, and Clark L. Wollenweber, Shell Oil Products US
Publication Date: 2004
$20.00

This paper provides an introduction on carbonate cracking and Los Angeles refinery’s recent experience with this corrosion mechanism. Also included in this paper is the methodology used for developing a risk assessment for equipment and piping susceptible to carbonate stress corrosion cracking in a fluid catalytic cracking unit (FCCU) gas plant.
Picture for Carbonate SCC Experiences in Unusual Locations
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51317--9596-Carbonate SCC Experiences in Unusual Locations

Product Number: 51317--9596-SG
ISBN: 9596 2017 CP
Author: Jeremy Nelson
Publication Date: 2017
$20.00

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.
Picture for Carbonate Stress Corrosion Cracking of Carbon Steel in Refinery FCC Main Fractionator Overhead Systems
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Carbonate Stress Corrosion Cracking of Carbon Steel in Refinery FCC Main Fractionator Overhead Systems

Product Number: 51390-90206-SG
Author: J.H. Kmetz, D.J. Truax
Publication Date: 1990
$20.00

Intergranular cracking and faiulure of carbon steel piping and vessels of FCC Main Fraqctionator overhead systems in NH3-H2S-CO2- containing environments is attributed to carbonate stress corrosion cracking. From plant water sampling program, cracking is correlated with water chemistry, open circuit potential and pH.
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