Centrifugal pumps are widely used in electric power production, because of their wide range of performance (including flow, pressure head and loss of media properties), small size, simple structure, easy operation, uniform flow, long life, Prominent advantages such as lower acquisition costs and lower operating costs. There are many varieties of centrifugal pumps. Although the structures of various types of pumps are different, the main components are basically the same. The main components of the centrifugal pump include: impeller, pump shaft, pump casing, pump seat, stuffing box (shaft seal device), leakage reducing ring, bearing seat, etc.