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Case study: A leak occurred in a Fluid Catalytic Cracking unit main fractionator overhead line elbow in June 2006. Following this leak, investigations showed acidic corrosion-erosion in the overhead circuit. This type of corrosion was unexpected in this circuit.
A leak occurred in a FCC unit main fractionator overhead line elbow in June 2006. Following this leak, investigations showed acidic corrosion-erosion in the overhead circuit. This type of corrosion was unexpected in this circuit. Process water analysis revealed that during normal process operations, acidic corrosion was not possible. 2002-2006 unit run analysis highlighted the fact that this unit has been frequently in a transient phase called catalyst recirculation. Water sampled during those periods exhibited a very low pH due to the presence of sulfuric acid. During catalyst recirculation operation sulfur trioxide is formed. SO3 goes up in the main fractionator overhead and condenses as H2SO4 with the water vapor. This media has corroded carbon steel equipments located after the water dew point. A way to mitigate this corrosion is a condensed water pH control during those periods. This paper covers the description and the explanation of this leak. Keyword: Refining, Corrosion Failure, FCC unit, Acidic dew point corrosion, Sulfuric acid corrosion
The purpose of this paper will be to: (a) review published literature to characterize and classify speciation related to the types of impurities encountered in opportunity crudes; and (b) describe and categorize published case studies of corrosion in crude unit overhead operations.
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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.
This paper will demonstrate the fundamental corrosion issues encountered in Sulfur Recovery Units. It will address the Claus process chronic corrosion problems such as sulfidation, sour environment cracking, weak acid corrosion, etc.