Improving Oxidation Resistance Wear Properties of Valves Trays Used in Oil Distillation Towers

Abstract

Valve trays play an important role in the refinery crude oil distillation process. Valve trays are covered by lift able caps. The lifting cap positions vapor to flow horizontally into the liquid which providing better vapor/liquid contact and better separation at each tray. Corrosion and wear resistance are the most important properties should be found in the valve trays and caps. This research deals with increasing corrosion and wear resistance of valve trays and caps using thermal spray technique. (Ni Al Cr) powder was used to apply coating layer on the substrate surface. Some mechanical properties are evaluated for the coating layer. Oxidation test was performed using oxidation system. Data and results revealed that the coating layer with the thickness of 100 µm has slightly resistance against oxidation, while the thickness of 200 µm has excellent oxidation resistance and good peeling resistance. Thickness of 300 µm has excellent oxidation resistance but has poor peeling resistance.