Purpose. The present paper focuses on study of the pump performance with six different values of impeller outlet width. Methodology. In order to determine the dependence of impeller outlet width on the slope of characteristic curve in different operating modes, the numerical simulation was used. Findings. We have analyzed publications related to research studies on centrifugal pump with changing impeller outlet width. The cause of efficiency reducing in extremely narrow and wide impellers was determined. Relationship between impeller outlet width of double-entry centrifugal pump and slope of characteristic curve was established. Originality. We have defined that changing of the impeller outlet width within some relative width range results in achieving required characteristic curve slope with inessential efficiency drop. Practical value. The study results are intended to be used while modernizing pump impellers with specific speed, which operate in groups with different initial characteristic curves. Such modernization is possible with existing pump casing and bearing compounds usage, that reduces expenses on modernization significantly and lowers pumping equipment life-cycle cost.

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