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Refiners often consider increasing the amount of sour or high total acid number (TAN) crude processed to improve the refinery’s profitability. Typically, as sulfur levels increase, the risk of sulfur corrosion on low chrome steels increases within the crude unit. And, as crude oil TAN levels are increased, the risk profile for high-temperature naphthenic acid corrosion increases within the crude unit. Higher amounts of naphthenic acids can lead to higher rates of corrosion in the desalted crude oil, diesel, gas oil, and bottoms circuits—negatively impacting unit reliability and performance.