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VOL XXVIII, NO 17

Condenser Tubesheet Restored With Belzona

 
 

Industry:

Power (POWR)

 
 

Application:

Heat Exchangers (HEX)

 
 

Customer Location:

Nuclear power station, Eastern Canada.

 
 

Application Date:

August 2013

 
 

Application Situation:

Main Condenser tubesheet at a nuclear power station

 
 

Problem:

The tubesheet had suffered from bimetallic corrosion around the tubes and at the edges of the tubesheet as well as metal loss due to erosion.

 
 

Products:

Belzona 1311 (Ceramic R-Metal)

Belzona 1331

Belzona 2211 (MP Hi-Build Elastomer)

 

Substrate:

Steel

 
 

Application Method:

Application was carried out in accordance with Belzona System Leaflets HEX-1 & HEX-5. Afterr grit blasting, the eroded areas were rebuilt using Belzona 1311l. Once the substrate profile was restored, Belzona 1331 was applied as a two coat system to provide overall corrosion protection across the affected areas on the tubesheet and water box. Finally, a flexible joint was created between the waterbox and the tubesheet using the Belzona 2211 to allow for movement between these parts.

 
 

Belzona Facts:

Following the failure of the previous lining, the customer required a system which could be quickly applied and returned to service. Belzona 1331 was chosen for its ease of application and applicability even in confined spaces. Belzona products were able to provide the erosion and corrosion resistance required together with flexible solution for the tube sheet/waterbox junction.

 
 

Photographs Description

  1. Tubesheet and waterbox edges following thorough grit blasting
  2. Close up picture of the severe pitting along the water box edge
  3. Following application, the Belzona 1331 was dressed down around each tube 
  4. Finished application. Also visible at the top of the image is the Belzona 2211 joint
 
 
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For more information about Belzona visit: www.belzona.com