KHIA headerKnow-How in Action


Belzona® Upgrade To Large Transformer



Power (POWR)



Valves, Pipes and Fittings (VPF)


Customer Location:

Power plant, North of France


Application Date:

January 2012


Application Situation:

70 Flange faces of one of the transformers. Large transformer with no fewer than 70 flanged joints.



Oil was leaking from many of the flanges. Replacing the seals was not an option. This would have required draining the 42 tonnes of oil from the transformer as well as individually dismantling the 70 flange faces, a very time-consuming task.



Belzona® 1161 (Super UW-Metal)





Application Method:

Application was carried out in accordance with Belzona Know-How System Leaflet VPF-11a.. After the surface was prepared using an MBX Bristle Blaster followed by degreasing the substrate, Belzona® 1161 and Belzona® 9341 (Reinforcement tape) were applied onto the whole surface of the flange faces in order to stem the leaks.


Belzona Facts:

Belzona offered a cost-effective solution to the client to cold-seal the leaking flange faces without the need to drain down the oil. The application only took two weeks to complete, far less than the alternative of replacing the seals, and allowed a quick return in service of the transformer.


Photographs Description

  1. Original condition of the flange faces
  2. Repair with Belzona® 1161 and Belzona® 9341
  3. Belzona being applied to encapsulate the bolts
  4. Finished application.
Case study pic one


 Case study pic two


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 Case study pic four


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