Numerical Study of Reducer Modification with Adjuster Opening Variations on Turbine Lube Oil Pipe

The success criteria of the power plant are represented by EAF (Equivalent Availability Factor) value. In 2021, one causes Forced Outage (FO) at Adipala Steam Power Plant was failure main lube oil turbine pipe. sudden contraction reducer resulted in previous failure. Modifications were made to using a conical shape reduce number welding processes and minimize probability Therefore, study on modification needs be carried out impact changing opening check valve process parameters flow focus this study. This research aims analyze pressure existing adjuster modified adjuster, Computational Fluid Dynamics technique with variations (distance between tip inner wall reducer). inlet boundary condition defined 285803.4 Pa. Outlet set mass 65.72 kg/s. curve surface as conditions stationary wall, no-slip, standard roughness model. increased compared adjuster. required distribute bearings. With small increase after modification, transfer improved. drop (Δ P ) value that occurred conical-shaped smaller than is because resistance less streamlines formed backflow vortex due fewer obstacles