KHIA headerKnow-How in Action


Belzona® Seals Transformer Lid Flange



Power (POWR)



Valves, Pipes and Fittings (VPF)


Customer Location:

Gas Distributor, UK


Application Date:



Application Situation:

Lid gasket flange on this 66-11Kv transformer.



Most of the gasket had failed around the 10m perimeter of the lid, with oil seeping down the sides and going to ground. Unfortunately it was not possible to drain the oil below the gasket level and so the application had to be pursued as a live leak with a 1m head pressure.



Belzona® 1291 (ES Metal)

Belzona® 1221 (Super E Metal)

Belzona® 1161 (Super UW Metal)

Belzona® 5831 (ST Barrier)



Carbon Steel


Application Method:

Application was carried out using Belzona Know-How System Leaflet VPF-11 as a guide. Area of flange and bolts were pressure cleaned and grit blasted. Live leaks stemmed with Belzona® 1291 and Belzona® 1221. Bolt heads top and bottom were encapsulated with Belzona® 1161. Belzona® 1161 and Belzona® 9341 used to create a reinforced band around the flange. Finally over coated with Belzona® 5831.


Belzona Facts:

The customer was desperate for a fast solution to the problem and whilst there were a couple of very minor leaks still on completion, these were deemed to be well within acceptable limits. The customer was delighted with the results and is looking to repeat the application to other transformers on their site.


Photographs Description

  1. Original condition of flange with header tank at rear
  2. Encapsulation of bolts with Belzona® 1161
  3. Completed repair close up
  4. Finished work after 3 days
Case study pic one


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 Case study pic four


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