September 2006

Corrosion/Maintenance

Major improvements in reactor effluent air cooler reliability

Joint industry program provides a new methodology for assessing and controlling ammonium bisulfide corrosion

Cayard, M. S., Flint Hills Resources, L.P.; Horvath, R. J., Consultant; Kane, R. D., Honeywell Process Solutions

The first phase of a major joint industry program (JIP) generated significant new engineering data and developed a new understanding of ammonium bisulfide (NH4HS) corrosion commonly found in many refinery processes. The new information has been used as a basis for developing a comprehensive predictive model for corrosion assessment of H2S-dominated, ammonium bisulfide-containing sour water systems, especially hydroprocessing unit reactor effluent air coolers (REACs) and associated inlet and outlet piping. It includes a new methodology for assessing and controlling ammonium bisulfide corrosion. It is applicable to a wide range of commonly used materials of construction to help attain safe and

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