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VOL XXXI, NO 110

Belzona® Rebuilds Eroded Tube Sheet Base

 
 

Industry:

Heating, Ventilation & Air Conditioning (HVAC)

 
 

Application:

Heat Exchangers (HEX)

 
 

Customer Location:

BC, Canada

 
 

Application Date:

October 2010

 
 

Application Situation:

Eroded tube sheet base

 
 

Problem:

The molten slag is dripped into water spray which cools it to form granules much like grains of sand. The slag is removed and the water is then cooled and reused in a closed cycle

 
 

Products:

Belzona 1391 (Ceramic HT)

 

Substrate:

Mild Steel

 
 

Application Method:

The application was carried out in accordance with a modified Belzona Know-How System Leaflet HEX-1. And using tapered EPDM plugs in the tubes. Belzona 1391 was injected and allowed to flow around the EPDM plugs forming a new “ceramic base”, then plugs were removed after the material had cured.

 
 

Belzona Facts:

This tube sheet was horizontally situated and contained 2300 tubes. Operating at 80°C, it was decided to use Belzona 1391. The use of tapered EPDM Plugs meant that each tube opening was conical and easy to remove once material had cured.

 
 

Photographs Description

  1. The tube sheet was grit blasted to a near white metal finish leaving a blast profile of approximately 3 mil.
  2. The EPDM plugs were inserted into each of the 2300 holes and levelled off with a straight edge. Belzona 1391 was injected into the space around the EPDM plugs to a depth of ¾ inch in places.
  3. e EPDM plugs were removed after the material cured, leaving a smooth Thconical hole.
 
 
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For more information about Belzona visit: www.belzona.com