The analysis of two blades self-priming solid-handling centrifugal pumps is carried out through a 1D/3D numerical approach. This class of pumps have to undergo to some particular constraints, such as allowing the passage of solids with a prescribed minimum size and a high level of mechanical resistance, in conjunction with as high as possible performances and capability to self-prime. The study of this kind of machines, which at this time is based almost entirely on empirical data derived from experience, can receive great advantages from the three-dimensional numerical simulations. Recent developments in CFD calculations can provide a means to follow this guideline. Some variants of the blade mean line have been studied numerically through a two-step procedure: (i) a preliminary 1-D design and (ii) a subsequent 3-D modelling using the CFX-TASCFlow code in order to optimise the pump performances in terms of hydraulic efficiency and head.
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