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Chlorine is often present in crude oils and the concentration can vary greatly depending on the origin. If not removed, chlorine can react to form highly corrosive hydrochloric acid in areas such as crude tower overheads, leading to serious operational issues, economic loss, and safety concerns. The need for a reliable online chlorine analyzer for refining process control is more important than ever. Clora Online (Clora OL) complies with the ASTM D7536 method and delivers continuous chlorine analysis to monitor plant equipment corrosion. By monitoring desalted crude, a plant can optimize performance and immediately see the impacts of crude changes (including organic chlorides). Additionally, monitoring overhead water can provide the necessary feedback for chemical feed.