Abstract
Butterfly valves are widely used in different industries due to their simplicity; however, they are susceptible to different types of corrosion depending on the environment and operating conditions. In this study, chemical analysis, visual observations, stereomicroscopy and scanning electron microscopy (SEM) examinations, and EDS analysis were used to determine the causes of failure of a nickel aluminum bronze butterfly valve used in a seawater desalination unit at a refinery plant. The numerical method Computational Fluid Dynamics (CFD) was applied to simulate the effect of butterfly valve opening on the fluid behavior and ultimately on failure. Further, Fluid Structure Interaction (FSI) was used to demonstrate the effects of fluid and flow parameters on the valve and stress distribution. This case study suggests erosion corrosion and cavitation are the main failure mechanisms.
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