Allowable minimum impeller diameter



Q  -   What is the minimum diameter can an impeller be cut to?


A  -  The minimum diameter an impeller can be cut, or trimmed, usually depends
on whether the impeller is of radial, mixed flow, or axial flow (propeller) design.


Typically, the allowable minimum diameter, as a percentage of its maximum
diameter, is as follow:

radial impellers                80%
mixed flow impellers       90%
axial flow impellers          95%


Because the performance of an impeller deviates more from the affinity laws as
the impeller cut increases it is a good practice to estimate the impeller cut
diameter from a reference performance curve obtained at a diameter closest to
the estimated diameter.



R: 1109-ALMI
D: design
F: impeller diameter


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