Reducing cavitation effects
Centrifugal, helical-centrifugal and axial-flow pumps: cavitation

There are several ways to limit the harmful effects of cavitation and/or improve pump operating ranges:

• reduce the NPSH of pumps by acting on the design of the impeller and feed components;

• limit the consequences of cavitation (noise, erosion, vibration) through appropriate mechanical design and choice of materials;

• in some cases, use a feed inductor or impeller installed upstream of the impeller, mainly in centrifugal pumps.

• Pump NPSH improvement

  By modifying the main geometric parameters of the impeller inlet vanes, it is possible to design pumps whose cavitation performance can vary over a very wide range.

  The main geometric parameters to be varied are: D₁ impeller diameter, β₁ blade inlet angle, z_r number of blades, e₁ blade thickness,...