When first commissioned in 1930 it was also one of the first hydropower plants on the Rhine to have all the features of a modern run-of-river power plant. Two of the original units were supplied by Escher Wyss — now ANDRITZ. Thus, ANDRITZ is not only the original OEM supplier but has also now received a contract from Kraftwerk Ryburg Schwörstadt AG for the rehabilitation of all four vertical, double-regulated Kaplan turbines and auxiliaries at the plant. The units will be renovated (one per year) between 2023 and 2027.
This rehabilitation project will increase annual energy production, as well as improve environmental performance through technical optimization and oil-free bearing systems on the wicket gates and oil-free hubs in the new runners.
The ANDRITZ scope of supply and services for the hydro-mechanical overhaul includes the hydraulic turbine governors and comprises design, engineering, manufacture of new parts, factory overhaul, transport, erection, testing, and commissioning. Also worth highlighting are the homologous model testing and the delivery of four new Kaplan runners with oil-free hubs. These are the first oil-free runner hubs ever installed in Switzerland. As part of the refurbishment, the guide vane and air intake valve are to be converted to maintenance-free bearings and the couplings, runner servo motor, and shaft seals are all being rebuilt. In addition, on-site armoring of the draft tube cone and corrosion protection on all turbines will be renewed on installed components such as stay vanes, upper and lower support stay vane ring, and draft tube cone.