
168 Practical Centrifugal Pumps
9.4 Preparation for reassembly
9.4.1 Impellers
The pump impeller is a rotating part, subjected to high velocity; and the adverse effects of
poor hydraulic design can be a cause of wear and erosion. As mentioned earlier the vanes
need to be examined for cavitation and recirculation phenomenon. This information needs to
be communicated to the operations.
Any corrosion of impeller should be viewed seriously and a review of the material of
construction should be made if the corrosion rates are excessive.
A badly worn/corroded impeller should be replaced.
When the impeller is to be reused, the fit of its bore with ...