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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