Abstract: The main objective of this project is the  study of the internal coating of a pump operating in an erosive environment. Initially, using computational fluid dynamics the examined pump (multistage vertical turbine pump) will be designed and the areas most succeptiple to erosion will be determined. Additionally the substrate treatment will be examined and for this reason specimens with various surface treatments will be developed. Also the stoichiometry of the coated films will be examined through experimental and analytical procedures. The experimental procedures will be based on nanohardness experiments, impact tests, and erosion tests  while the analytical procedures will be based on finite element simulation. After selecting the appropriate coatings, the pump will be prepared using the suitable surface treatment and will be coated with the appropriate coated film (plasma or HVOF). The research team will also develop an automated experimental setup for continuous monitoring of erosion and other parameters for the evaluation of the performance of the coated pumps.