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Overhead condensers (OHC) in refinery applications such as atmospheric and vacuum distillation unitsoften experience very corrosive environments due to condensation of hydrochloric acid, HCl. The acid isoften neutralized using water washing and addition of a caustic solution such as ammonia (NH3) or anorganic amine such as monoethanolamine (MEA) or dimethylethanolamine (DMEA). While neutralizingthe HCl, addition of these bases can lead to chloride salt deposits with following possible pitting corrosion,under deposit corrosion and stress corrosion cracking of the tubes in the OHC. In this work, the recentlydeveloped grade UNS N08935 has been tested in a laboratory environment mimicking ammoniumchloride under-deposit corrosion and aqueous acidic corrosion in OHC applications. The results from thetesting will compare the performance of N08935 to super duplex stainless steel UNS S32750 and nickelbase alloy UNS N06625 being exposed to different temperatures, HCl and NH3 concentrations and flowrates representative of crude unit overhead condenser operating conditions.
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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.