KHIA headerKnow-How in Action


Belzona® Seals Oil Leaks On Transformer Bushings



Power (POWR)



Valves, Pipes and Fittings (VPF)


Customer Location:

Gas-Fired Power Plant - Toronto, Canada


Application Date:

June 2012


Application Situation:

During the summer outage, the maintenance crew  noted that some oil was present in the sump pit beneath the transformers.



It was noted that a small oil leak was present at the bushing. No oil should leak from this bushing. The heavy electrical cables were not supported adequately.



Belzona 1161 (Super UW Metal)



Ceramic & Metal


Application Method:

Application was carried out in accordance with Belzona Know-How System Leaflet VPF-11. The ceramic insulator was roughened with a Dremel before applying the Belzona 1161 by brush to seal the oil leaks.


Belzona Facts:

The conventional alternative would have been to drain the transformers, replace the ceramic insulators including the bushings. It would have taken at least 2 days to complete this project. The application of Belzona 1161 as described only took 3 hours per transformer. Two transformers were completed within the same shutdown.


Photographs Description

  1. Transformer bushings 
  2. Ceramic insulator after abrading with Dremel and cleaning 
  3. Ceramic insulator and bushing masked off 
  4. Application completed
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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