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  1. 26.
    0
    Impeller velocity
    Impeller diameter
    Number of impeller blades
    Impeller eye diameter
    Impeller thickness
    Curve angle of the impeller blades
    Surface structure of internal surfaces
    Wear rings tolerance
    Mechanical losses
    Viscosity
    Size of solid particles
    Type of pump (special designs generally reduce efficiency)
    ···
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