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Service Life Of Dredging Flush Water Pump Extended With Belzona



Marine (MRNE)



Centrifugal Pumps (CEP)


Customer Location:

Drydock, Bremen, Germany


Application Date:

October 2008


Application Situation:

Rubber-lined KSB flush water pump on North Sea dredger.



Extensive cavitation damage near impeller and high pressure areas. Cavitation and erosion had led to the pump casing’s rubber lining being partly eroded. Further erosion damage was found on the casing.



Belzona® 1311 (Ceramic R-Metal)

Belzona® 1812 (Ceramic Carbide FP)

Belzona® 2141 (ACR-Fluid Elastomer)



Cast iron


Application Method:

The application was carried out in accordance with modified versions of the Belzona Know-How System Leaflets CEP-3 & 5. After surface preparation, Belzona 1812 was used to rebuild damaged areas. Belzona® 1311 was then used to smooth the surface before applying the Belzona® 2141 Elastomer system. to give maximum resistance to cavitation erosion.


Belzona Facts:

Medium pumped is seawater with high solids content (mud/sand). The pumps are working at their limit, i.e. at a flow rate of up to 40m/s leading to the cavitation risk. Service life of the pump prior to the repair was three months, after rebuilding and protection with Belzona a minimum 18 months continuous service was achieved.


Photographs Description

  1. Damaged rubber-lined pump
  2. Close-up of one of the damaged areas
  3. Damage rebuilt with Belzona® 1812
  4. Completed application with Belzona® 2141 Elastomer applied
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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