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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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Author: J.H. Kmetz, D.J. Truax
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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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