The existing plant suffered from various issues, rectified as follows:
The original intake was poorly designed, became blocked several times a day and could not be easily or safely cleaned. Dulas completely rebuilt the intake to allow installation of AquaShear Coanda screens. The new intake requires minimal cleaning and has significantly improved plant availability.
Deformed casing due to a mis-aligned turbine, generator and draft tube, and omission of a pipeline anchor block with resultant pipeline thrust forces acting on the turbine casing. Dulas stripped down the turbine, cut and rewelded the draft tube, re-aligned the turbine and generator, and restrained the inlet pipework.
Faulty wiring on the AVR and ventilation system was replaced.
Non-functioning PLC software was completely re-written and a SCADA System added to enable remote monitoring.
The scheme is now operating fully automatically, free of electro-mechanical and screen blockage problems, generating around 1000MWh/yr.