KHIA headerKnow-How in Action

VOL XXVI, NO 103

Belzona® Seals Transformer Bunding

 
 

Industry:

Power (POWR)

 
 

Application:

Gaskets, Seals and Shims (GSS)

 
 

Customer Location:

Electrical power company, Sweden

 
 

Application Date:

August 2010

 
 

Application Situation:

Bund for oil-filled transformer at electrical sub-station in central Sweden.

 
 

Problem:

The bunding for oil-filled transformers was made up of many interconnected small concrete bunds. Connection to each bund was through polyethylene pipes. These pipe penetrations were sealed with rubber sleeves. The outer walls had polyurethane foam inserts. The glands and end-plugs were leaking since the concrete bunds were moving independently of each other. There were 32 penetrations in total with 62 sealing points on either side of the penetrations. The power company decided to seal all the pipe penetrations. The 18 end plugs in the outer wall were also replaced with Belzona. 

 
 

Products:

Belzona® 4111 (Magma Quartz)

Belzona® 2141 (ACR-Fluid Elastomer)

 

Substrate:

Concrete and polyethylene

 
 

Application Method:

Application was carried out in accordance with modified versions of Belzona Know-How System Leaflets GSS-4 and TCC-15. Belzona® 2141 was used to seal each side of the pipe penetrations and Belzona® 4111 was used to replace the end caps in the perimeter wall. 

 
 

Belzona Facts:

The customer was very satisfied with the application. Following an inspection in 2012  which showed no leakage of thawed ice which had accumulated in the bunds over two winters, a similar bund was sealed using the same procedure.

 
 

Photographs Description

  1. Transformer sub-station in central Sweden 
  2. Diagram of the secondary containment under the transformer. Note the glands and end plugs 
  3. Leaking gland 
  4. All penetrations were sealed with Belzona® 2141
 
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