March 2013

Special Report: Corrosion Control

Monitor and minimize corrosion in high-TAN crude processing

In addition to inhibitor dosing, intensive corrosion monitoring and analytical tests play a major role in equipment and piping health monitoring and in analyzing stream properties online.

Ghoshal, S., Sainik, V., Indian Oil Corp. Ltd., Mathura Refinery

High-acid crude (HAC) oils, also called high-total acid number (TAN) crudes, are oils where TAN [expressed in terms of milligrams of potassium hydroxide per gram (mg KOH/g)] is more than 0.5. Acidity is mainly due to the presence of naphthenic acids. These crudes trade at discounts of about $3/bbl to $10/bbl to conventional crudes; therefore, processing these crudes improves refinery bottom lines. However, processing high-TAN crudes is also challenging for refineries, especially those not designed to handle naphthenic crudes. Refinery asset reliability during high-TAN crude processing is paramount. Hardware changes—i.e., upgrading materials construction from carbon steel (CS) and all

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