BELZONA PROVEN CAVITATION PROTECTION TO FRANCIS TURBINE

KHIA ID: 1441
Industry: Power (POWR)
Application: CEP-Centrifugal Pumps (CEP)
Substrate: Cast Iron
Customer Location: Hydroelectric plant, Slovakia
Application Date: 2004 and 2007
Products:

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

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