The output of NLO350-400 condensate pump in a newly built power plant was insufficient during commissioning process

namely the single pump can not meet the needs of rated load operation.Analysis showed that the inducer at suction part of the condensate pump and the first stage impeller can not satisfy the output requirements of the condensate pump

and the anti-steam erosion ability of impeller entrance part of the condensate pump was insufficient when the condensate water flow was large.After redesign and processing the first stage impeller

the inducer

the inducer room and the bell mouth at inlet of the pump

the single condensate pump can run stably under both constant and variable frequency working conditions

when the unit was in rated load operation.The output of condensate pump satisfied the design requirements.