This paper summarizes the survey results on crude unit overhead corrosion control practices. The survey was conducted by TG 342 which was assigned to update NACE(1) publication 34109 “Crude Distillation Unit – Distillation Tower Overhead System Corrosion”. As part of the survey, refiners provided responses about their respective chemical injection and monitoring practices. The survey focused mainly on atmospheric towers and included the following topics: overhead water wash, caustic addition, desalter acidification, filming/corrosion inhibitor and neutralizer injection, salt point and water dew point, sampling, and corrosion control performance. With respect to vacuum towers, overhead pH control is also discussed. This paper presents summary statistics of the responses for each of these topics and is intended to give the reader a more comprehensive insight into general practices that are being employed across the industry.

Subject
Water, Salts, Corrosion rate, Acidification, Water dew, Acidity, Desalting, Equipment, Crude, Corrosion protection, Surveys, Metallurgy, Chlorides
Keywords:
crude unit overhead, overhead water wash, caustic injection, desalter acidification, corrosion inhibitor, neutralizer, salt point, dew point, sampling frequency, vacuum overhead
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2019
Association for Materials Protection and Performance (AMPP)
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