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Pump Diffuser Repair Surpasses All Expectations With Belzona®



Power (POWR)



Centrifugal Pumps (CEP)


Customer Location:

National Electricity Provider, Malta


Application Date:

May 2000


Application Situation:

Sea water cooling system pump for a 60 MW turbine.



Efficiency losses and pump breakdown due to severe erosion-corrosion of the single vertical axial flow pump (7090 m³/h). Prior to the Belzona solution, the client had to replace the pump components annually. As a significant local electricity supplier, downtime of this critical equipment caused major problems.



Belzona® 1311 (Ceramic R-Metal)

Belzona® 1321 (Ceramic S-Metal)

Belzona® 5811 (Immersion Grade)



Cast Iron


Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflets CEP-1, CEP-3 and CEP-4.


Belzona Facts:

The customer was surprised that the eroded equipment could be repaired and delighted with the vastly improved reliability and performance. The pump casing and suction bell were also coated and protected internally and externally. After 9 years in service, the coating was found to still be in excellent condition.


Photographs Description

  1. Condition of the pump diffuser after 1 year in service
  2. Rebuilding of the vane profiles
  3. The finished application
  4. Application after 9 years service
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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