Respected Members,

I need design support for centrifugal pump development. We are going to develop hygienic centrifugal pump with annular (Circular) Casing with open impeller. We refer Gulich J.F. - Centrifugal Pumps for pump design. We have developed calculation for volute casing pump. But when we convert it circular casing at that time our BEP is shift towards low flow side. Anybody have any reference or calculation for circular casing inner diameter and throat area.

Thanks & Regards