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Topic: Re: Impeller balance holes

posed by 
The role of the balance holes in an impeller is to balance the pressure on each side of the impeller, and thus, the magnitude and often direction of the resultant axial thrust on the impeller. Drilling holes in an impeller will effectively change the hydraulics of that impeller. As you don’t indicate why you would even consider such an action, I am unable to offer any further assistance.