Abstract: High-speed centrifugal pump is of small flow and high lift. It has stable specific performance coefficient, reliable and steady speed-up mechanism and sealing device, high anti-cavitation and corrosion resistance performance. The high-speed centrifugal pump can run continuously for 3 to 5 years. And whether the maintenance and overhaul work is in place or not is directly related to the service life of the pump and the continuous production time of the device. So the maintenance work of high-speed centrifugal pump is very important in a refining enterprise. Reliable maintenance and correct overhaul methods are the guarantee for the stable and long-cycle operation of high-speed centrifugal pump.

Key words: high speed centrifugal pump, mechanical seal, inducer, seal flatness, axial clearance