KHIA headerKnow-How in Action

VOL XXIV, NO 63

Impeller At Nuclear Plant Repaired And Protected With Belzona

 
 

Industry:

Power (POWR)

 
 

Application:

Centrifugal Pumps (CEP)

 
 

Customer Location:

Nuclear Power Plant, North Carolina

 
 

Application Date:

August, 2009

 
 

Application Situation:

Cooling tower Recirculation pump impeller.

 
 

Problem:

A combination of de-Alumininification over the surface of the impeller and cavitation at root of the vanes was causing a significant reduction in the efficiency of this pump.

 
 

Products:

Belzona® 1341 (Supermetalglide)

Belzona® 1121 (Super XL-Metal)

Belzona® 2141 (ACR Elastomer)

 

Substrate:

Aluminum Bronze

 
 

Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflets CEP-1, -3, -5 & -10. Belzona® 1121 used to smooth the surface prior to application of Belzona® 1341 system. Belzona® 2141 was then applied 8" on either side of the vanes to protect from cavitation.

 
 

Belzona Facts:

The cost of labor and product was much lower than the cost to replace the impeller. From current draw, the application has also increased the efficiency of the pump, but no formal efficiency increase have been calculated.

 
 

Photographs Description

  1. Impeller before application of any product
  2. Application of the 1st layer of Belzona® 1341
  3. Application of the smoothing layer of Belzona® 1121
  4. Belzona® 2141 applied to complete the job
 
Case study pic one

 

 
 Case study pic two

 

 
 Case study pic three

 

 
 Case study pic four

 

 
 
For more information about Belzona visit: www.belzona.com