The motor top vibration of condensate pump a of 660 MW ultra supercritical unit in a power plant is large and the sound of pump running is dull. In order to eliminate this fault

some measures were taken

such as re alignment of pump foundation surface

replacement of bending pump shaft and inducer

off-line dynamic balance test of rotor and on-line dynamic balance test of water pump. Finally

the vibration was reduced to the qualified range

which solved the problem of excessive vibration of the pump

and ensured the safe and stable operation of power plant units. The ideas and methods to solve the vibration problems in this paper can be used for reference in dealing with similar pump vibration faults in the future.