March 2011

Special Report: Corrosion Control

Improving pH control mitigates corrosion in crude units

Equipment and pipe failures can be avoided through better desalting practices and inhibitor injections

For crude-unit overhead systems, pH is the main process parameter that impacts corrosion rates. To control corrosion conditions, many operators use various neutralizers at optimum ranges determined by site-specific conditions. A four-year study (2005–2008) was conducted at a Petrobras refinery using amine-blend solutions to control pH. Over this period, corrosion rates were measured through ultrasonic inspections and weight-loss coupons. Important process parameters monitored included: • pH, chloride and iron concentrations at the bottom of the overhead drum • Neutralizer and inhibitor flowrates. A qualitative comparison was done with two refineries, using two o

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