Abstract: High speed centrifugal pump is accelerated by gear, and there are two ways to increase the speed, i.e. single stage speed increasing and two stage speed increasing. High lift pumping system is needed for coal chemical industry and hydrogenation plant, so the rotary speed of the matching high speed centrifugal pump must be increased accordingly. Due to the high cost and assembly difficulty of two stage speed increasing, single stage speed increasing is selected to improve the efficiency of the pump. This paper mainly introduces the design of high speed centrifugal pump with the highest single stage speed increasing in China

Key words: single stage speed increasing, high lift, high pressure