Flow Accelerated Corrosion under Water-steam Two-phase flow in Horizontal pipe

Flow Accelerated Corrosion (FAC), one of the pipe wall thinning phenomena observed in power generation plants, is characterized by widespread thinning regions and involves a complex interplay between “corrosion induced by water chemistry” and “corrosion enhancement driven by fluid dynamics.” The influence of water chemistry is primarily represented by the solubility of iron oxide films, while the influence of fluid dynamics is expressed through the mass transfer coefficient. Although extensive knowledge has been accumulated regarding FAC under single-phase water flow conditions, insights into FAC behavior under water-steam two-phase flow remain limited. Experimental investigations have previously been conducted under water-steam two-phase flow conditions in vertical piping configurations. Therefore, this study conducts FAC testing under two-phase flow conditions in horizontal piping and presents the experimental findings.