Abstract：The centrifugal charging pump is multistage and double casing structure. The hydraulic performance of the pump needs to satisfy five operating conditions according to the demands of nuclear power plant. A technique that combinated various impeller hydraulic optimization design and impeller multi-condition design was put forward. A centrifugal charging pump was designed at multi-condition. The combination rules of multi-stage centrifugal pumps were applied to split the multi-condition points of the charging pump. An optimized design scheme from different impellers performance curves was obtained. The 1st stage impeller, 2nd-4th stage impellers and 5th-12th stage impellers were designed. A four-stage pump prototype(n=2 950 r/min) was manufactured according to the design scheme and its performance test was carried out. The test results scaled to normal speed of 4 500 r/min show that the heads of four operating conditions are 2.6% larger than that of requirements, and just the head at maximum flow rate is 11.8% lower than that of requirments. The multi-condition hydraulic design is realized.
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