Abstract

To improve the performance of a centrifugal pump as a turbine, one of the methods used is to modify the impeller housing. The impeller housing groove directs a certain speed fluid that enters the pump to convert mechanical energy from the pump into the rotating energy of a generator that produces electricity. The roughness on the inside of the pump housing will cause friction in the fluid flow, which will rotate the impeller so that it will reduce the flow velocity of the fluid, and the impact will decrease the impeller rotation, which results in the voltage and electric current generated by the generator being of small value. This study made modifications to increase the power (voltage and current) produced to be more optimal. There are three ways of modifications made to the impeller housing: modification of the impeller housing by using a lathe process, modification of the impeller housing by polishing using the sandblast method, and modification of the impeller housing by coating using the complicated chrome method. The three modifications carried out were tested on the pump device as a turbine (PsT), and the test data was taken for analysis and a conclusion was drawn that the modification of the impeller housing that has the most optimal impact on the power plant is the modification of the impeller housing with hard chrome with valve opening 100% at during testing because it produces a flow speed of 110 L/min, impeller rotation of 1050 rpm and electric power of 10.51 Watt.