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04639 Carbonate Cracking Risk Assessment of a FCCU Gas Plant

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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.

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
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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. The results of the risk assessment were used to identify which equipment and piping should be replaced during the 2003 Los Angeles refinery FCCU turnaround.

Keywords: carbonate cracking, carbonate stress corrosion cracking, Catalytic cracking unit

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. The results of the risk assessment were used to identify which equipment and piping should be replaced during the 2003 Los Angeles refinery FCCU turnaround.

Keywords: carbonate cracking, carbonate stress corrosion cracking, Catalytic cracking unit

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07564 FCCU Light Ends Plant Carbonate Stress Corrosion Cracking Experience

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
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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.
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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
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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
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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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