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SF6 leak repair on vertical flange under live conditions and pressure/outage

Industry: Power T&D

Application: SF6 Leaking Vertical Flange x 3

Customer: UK Electric Utility Substation

Date: April 2022

Problem: To fix three identified leaking/potentially leaking flanges on SF6 substation site

Solution: Vertical REFLANGEKiT® SF6 leak sealing. Flanges repaired under live conditions and pressure/outage

Works:

  • Leak surveyed/identified using EMT SF6 leak detector
  • Environmental/climatic conditions surveyed and approved
  • Surface preparation works undertaken
  • Cleaning and degreasing of surfaces carried out
  • Phase one flange repair –  soft shell mounting completed; the purpose of the soft shell is to protect the functional parts of the flange i.e. bolts and seals, and to concentrate the leaked SF6 gas to a single point of the shell where the valve is located. This was followed by re-enforcement of the soft shell
  • Phase two flange repair –  hard shell and resin application completed; resin was injected into the hard shell and left to cure overnight
  • Sleeve removed, valve sealed, and leak test undertaken using EMT SF6 calibrated leak detector, concluded with final seal and post repair testing

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