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VOL XXIII, NO 108

Pump Bell Casing Repaired And Protected With A Long Term Belzona® Solution

 
 

Industry:

Power (POWR)

 
 

Application:

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.

 
 

Problem:

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 or repair the pump components annually. As a significant local electricity supplier, downtime of this critical equipment caused major problems.

 
 

Products:

Belzona® 1311 (Ceramic R-Metal)

Belzona® 1321 (Ceramic S-Metal)

Belzona® 5811 (Immersion Grade)

 

Substrate:

Cast Iron

 
 

Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflets CEP-5, CEP-3 and CEP-4.

 
 

Belzona Facts:

The original bell lining was failing on an annual basis, leading to pitting corrosion and regular replacement. The Belzona repair vastly improved reliability and performance. The pump casing, liner and diffuser were also repaired and coated, internally and externally. Yearly touch up is required of the sacrificial coating in the swept area due to cavitation damage. original Belzona protected bellmouth still in service after nine years.  

 
 

Photographs Description

  1. Original system after 1 year in service
  2. The finished Belzona application
  3. Cavitation damage in the swept area
  4. Ready to go back into service after touch up
 
 
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For more information about Belzona visit: www.belzona.com