KHIA headerKnow-How in Action


Belzona® Proven Cavitation Protection To Francis Turbine



Power (POWR)



Centrifugal Pumps (CEP)


Customer Location:

Hydroelectric plant, Slovakia


Application Date:

2004 and 2007


Application Situation:

Francis turbine runner, 800mm diameter, 40-50m head and optimum 600rpm. Power output  2.1MW with 4m³/s flow rate.    



Cavitation had caused erosion of the metal and loss of turbine performance. Belzona® 1311 and Belzona® 1341 had been applied in 2004, but had suffered further cavitation, so system upgraded by applying more cavitation resistant Belzona® 2141.



Belzona® 1311 (Ceramic R Metal)
Belzona® 1341 (Supermetalglide)
Belzona® 2141 (ACR Elastomer)



Cast Iron


Application Method:

Application was carried out in accordance with Belzona Know-How System Leaflets CEP-3 and CEP-10


Belzona Facts:

Inspection of the Belzona Ceramic coating in 2006 showed damage from cavitation, so specification was changed to Belzona® 2141. Futher inspection after 2 years showed no damage on the turbine runner. In 2013 small areas of coatig damage were repaired with further Belzona 2141.


Photographs Description

  1. Cavitation damage to turbine runner 
  2. Belzona® 1341 showing some cavitation damage 
  3. Belzona® 2141 being applied to the runner 
  4. After 24 months service Belzona® 2141, inspection shows no further cavitation damage
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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