KHIA headerKnow-How in Action

VOL X, NO 12

Belzona® Pump Diffuser Protected



Water / Wastewater (WATR)



Centrifugal Pumps (CEP)


Customer Location:

Sewage Treatment Plant in Northern California


Application Date:

September 1982


Application Situation:

Centrifugal pump diffuser



Erosion/corrosion and cavitation



Belzona® 1311 (Ceramic R Metal)
Belzona® 1321 (Ceramic S Metal)



Cast iron


Application Method:

The application was carried out in accordance with Belzona Know-How Leaflets CEP-1 and CEP-2.


Belzona Facts:

This pump was in service for seven years with no damage until the unit was removed from service for other reasons. Extending the life of the pump diffuser saved the plant tremendous replacement costs.


Photographs Description

  1. The diffuser removed for repairs  
  2. Damage on flow surface  
  3. Close up of cavitation pitting   
  4. Repairs in progress using a rotating jig to create the internal shape and dimension without machining
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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