Future development of more efficient volute casing depends on improving understanding of the design and flow analysis of the volute casing. This paper reviews different aspects of design and flow behavior inside the volute casing. It describes advantages and disadvantages of the different designs, the relation between flow and geometry, the impact on the impeller and the flow behavior inside the volute. The main purpose is to provide an insight into the flow structure that can be used later to improve the performance or remediate some problems. The use of CFD is also discussed for the flow domain.

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