Fast reaction to findings prolonged turbine major overhaul by only four weeks – Case Umeå Energi, Sweden

The scope of the operating hour-based major overhaul had to be broadened on very short notice when findings requiring extensive repairs were discovered in the turbine. Thanks to rapidly including the unexpected work into the plan, the overhaul was ultimately prolonged by only four weeks.

Turbine rotor

Case description

Umeå Energi was looking for a qualified supplier to perform a regular operating hour-based major overhaul on the Siemens SST 600 turbine at the Dåva combined heat and power plant (CHP) just outside the city of Umeå. Fortum’s assignment consisted of the unit to be dismantled and inspected, its parts cleaned and repaired where necessary, and, finally, reassembled.

Without any hiccups, a turbine major overhaul normally takes around one month. But it is very common that opening the machine uncovers something surprising – as was the case with this turbine. As the dismantling work progressed, findings requiring extensive repairs were discovered in the rotor, stator, and control valves.

Fortum reacted fast to the findings and provided descriptions of the damage along with recommendations on how to repair the damage in the most cost- and time-efficient way. The overhaul was first extended by six weeks, but in the end the solution prolonged the overhaul by only four weeks.

”During the work, we were able to quickly handle the findings that required action. Fortum’s team on site handled their job extremely professionally,” says John Josefson, Operations Technician at Umeå Energi.

Umeå Energi Dåva 2 plant

Customer: Umeå Energi, Sweden
Site: Dåva 2 CHP in Umeå, producing electricity and heat for the surrounding community
Fuel: Biomass
Commissioned: 2010
Fuel power: 105 MW (75 MW heat, 30 MW electricity)
Turbine: Siemens SST 600
Boiler: Fluidized-bed boiler


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Teemu Heinonen

Head of Business Line, Turbines
Tel: +358 50 454 2134
teemu [dot] heinonen [at] fortum [dot] com