September 2010

Special Report: Refining Developments

Mitigate corrosion in your crude unit

Real-time analyzers can provide improved monitoring of chloride levels and enable better corrosion control practices

Hilton, N. P., Nalco Company, Energy Services Division

In the refining industry, 90% of crude-unit overhead corrosion occurs during just 10% of operating time. These periods of unstable operation may occur during crude tank switches, slop oil processing, processing of opportunity crudes, or other interruptions to normal operation. Traditional approaches to corrosion monitoring can easily miss problems that occur during this narrow “corrosion window,” or they may detect problems only after significant damage has already been done. Traditional corrosion monitoring methods. Traditional methods used to monitor and control corrosion in the overhead condensing system of an atmospheric crude distillation unit (CDU) may include installation

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