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All References

Challenge

Major overhaul on a 300MW Siemens Steam Turbine and increasing the durability of the rotor

Siemens Steam turbine overhaul 1 Steam Turbine overhaul 2

Solution

Welding refurbishment of the last stage blades both flows (tips and trailing edges) and of the vanes from the first stage
De-blading all of LP-rotor stages
Rehabilitation of the grooves on the LP-rotor discs (unexpected indication of cracks) including shoot peening
FEM calculation of the grooves in the LP-rotor after repair works main cause for cracks is weak design of blade root crack removal by grinding

Siemens Steam Turbine rotor repair 1

Benefits

LP rotor successfully overhauled and repaired
All unforeseen obstacles overcome
Repair method for cracks was developed and verified prior to application in consultation with AZT and VGB
Main contributors for awarding:
Technical skills
Short realization time
Attractive performance ratio