The reasons for wear in centrifugal pumps require careful consideration, even when running within the pumps intended characteristics, with no abrasive, corrosive of gaseous content, through correctly sized pipework systems, with no cavitation.

A mechanically and hydraulically balanced pump, perfectly designed, manufactured and assembled is still submitted to various types of loading, causing predictable wear of some components, resulting in a gradual loss of performance. Variable axial and radial loads acting on the same mechanical parts, mechanical abrasion on contacting parts of fixed and moving components and erosion caused by the pump liquid on the surface parts such as bodies, impellers, diffusers and wear rings, all combine to cause wear.imkv.cn ipod

The relatively high running speeds of centrifugal pumps, and the consequent fluid speed around the pump (proportional to impeller size) create an environment where any imbalance or contamination of the pumped liquid may quickly irreparably damage the hydraulic parts.http://www.imkv.cn/?p=166

Even under ideal operating conditions a pump will gradually wear to a point where, although the pumps performance may still be apparently acceptable, the damage to the major components will make reconditioning of the pump uneconomic, and eventually a catastrophic failure may occur.

To avoid these problems it is advisable to consider the following when choosing a pump, since there is no pump that will indefinitely retain its performance, but the right decision and maintenance will assure a long pump life.

Firstly the materials of construction, especially those used for the hardest wearing components; impellers, diffusers, bearings, bushes, wear rings, shafts, etc. This is of primary importance to assure resistance to wear, always ensuring the compatibility of the liquid to the pumped materials.

Secondly, the incorporation of wear parts purposely designed to be sacrificed during working, to protect the more important (and expensive) pump components.

This approach, promoted by companies working to provide a more durable and reliable product, allows a pump to be completely restored by replacing a few parts (wear rings, liners, bushes, etc.) and hence preserving the major components. This is the preferred solution particularly if these parts have been designed for easy and rapid replacement.