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Belzona® Recharges Shunt Reactor



Power (POWR)



Valves, Pipes and Fittings (VPF)


Customer Location:

Electricity Substation, UK


Application Date:

May 2012


Application Situation:

Shunt reactor 2, located inside the noise enclosure



During operation, the shunt reactor temperature can fluctuate significantly together with movement caused by vibration. The Shunt reactor had been discharging transformer oil for many years due to the difficulties in securing maintenance outages. Following a site survey, oil discharges were evident from the bushings and some inspection Hatches.



Belzona® 1221 (Super E-Metal)

Belzona® 1291 (ES-Metal)

Belzona® 1161 (Super UW-Metal)

Belzona® 5831 (ST-Barrier)



Mild Steel


Application Method:

Application was carried out in accordance with Belzona Know-How System Leaflet VPF-11. All if the bolt heads were tightened prior to the repair. After preparing the substrate, Belzona® 1291 and Belzona® 1221 were used to stem any active oil leaks. Flange joints were sealed by applying Belzona® 1161 incorporating Belzona® 9341 (Reinforcement Tape). The bolt and nut heads, together with the male studs were fully encapsulated using a disposable former containing Belzona® 1161. Once cured, the formers were removed and the prescribed repair areas were coated with Belzona® 5831.


Belzona Facts:

The leak sealing project was successful in recharging the transformer with oil to the correct level inspection hatches. The bolt heads and bushing flanges showed no further visual signs of leaking. This resulted in significant cost savings and future ease of safe access for the client. The clients request that the studs be protected prior to full encapsulation of the bolt heads to allow access for any future dismantling process was also met.


Photographs Description

  1. Shunt reactor prior to application
  2. Flange joints sealed using Belzona® 1161
  3. Encapsulation of bolt and nut heads
  4. Repair areas coated with Belzona® 5831
Case study pic one


 Case study pic two


 Case study pic three


 Case study pic four


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