In this paper I analysed the influence of the impeller geometry over the NPSH available of centrifugal pumps, in order to design and manufacture the best impeller. In centrifugal pumps design, a special attention must be given of the impeller feature of NPSH (net positive suction head, available to the pump), to forestall the cavitational working.
The methods of the NPSH available computation take account by the admission diameter of impeller, by the number of blades and by the inlet angle of the blade, ?1 , by the speed variation, etc.
I used in this analyse an own software that calculate the impeller geometry and estimate the available NPSH and I determinated the influence of the impeller geometry over the NPSH available feature for centrifugal pumps, by simulation different geometries of impellers.
I proposed also a graphical analyse regarding these design influences over the NPSH available feature of the centrifugal pumps, for radial or diagonal impeller, with small and medium dimensions. | 
