Corrosion Monitoring and Chemical Control in the Overhead System of Atmospheric Distillation Columns

This study investigates corrosion in the overhead system of atmospheric distillation columns, focusing on the role of crude oil properties and chemical additives. Field observations, supported by laboratory analysis, revealed that elevated levels of BS&W, salts, and sulfur significantly contribute to corrosion, mainly due to acidic condensate formation and chloride-induced degradation. Corrosion rates varied with operating conditions and were confirmed by inspection of system components. Chemical treatment effectively mitigated corrosion when key process parameters such as pH and chloride concentrations were optimized. These findings highlight the importance of targeted chemical control to extend equipment life and ensure stable refinery operations.