Project: ČHE Avče, Slovenia
Investor: Rudis, Trbovlje, SENG, Nova Gorica
Works: Repairing consequences of structural damage on turbine area

Condition of the structure: existing damage on turbines construction wall (structural steel), was made due to poor weld quality. Operating pressures are about 55 bar and cause a leak on the concrete structure of approximately 20.0 l/min, with an upward trend. In addition, the water is threatening the generator room, directly above the turbine: The turbine is Francis reversible power 180-185 MW, manufacturer is the Mitsubishi Heavy.

The process of restoration: conducted on the basis of diagnosis Euras Gel typ B was injected into concrete-met - al joint near the damaged area until homogenous sealing layer was formed. The gel penetrated through zones that were filled with water before and significantly reduced the seepage.

The same material is used to supplement the pit liner zone which definitely stopped the penetration of water into the generator area. Current leakage is around 0 lit/min. This condition is currently stable and meets the requirements of investors. In case of need we have developed Euras gel type g (with low-abrasive filler based on rubber flour) that would, with new injection, form a non-degradable deposits, watertight in areas between the concrete and metal struc - tures of turbine area, at the same time protecting against abrasion of turbine with which it may be in contact shortly.