Rehabilitation of a Francis turbine of powerplant Schwarzach, Austria

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Courtesy of Inspecteam Hydro

The rehabilitation of the Francis turbine group 1 of Power Plant Schwarzach (Austria) is presented, taking into account the background problems linked to the liberalization of the european energy markt. The technical challenge has the goal to reduce the re-assembling time on site and increase the turbine life time.

The rehabilitation of the Francis turbine group 1 of Power Plant Schwarzach, Austrian Hydro Power AG, was performed 1998-1999 thanks to the collaboration beetween FV-Stell Engineering (Switzerland), FRAVIT (Italy) and Austrian Hydro Power (Austria).

The check of the turbine geometry (perpendicularity between shaft and spiral casing) by means of an on site rotating device and the possibility to correct any possible non-perpendicularity by milling on site are special services which have made it possible to pre-assemble the turbine in FRAVIT's workshop, thus reducing the assembly time on site from four to two months.

The coating with Tugsten Carbide of the runner, the guide blades and of all the most critical rings and labirinths had the aim to achieve a longer lifetime; which is now expected to be ten years in spite of five.

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