In addition, there was considerable evidence of erosion on the blades, the disks and the balance correction holes. Sulzer’s initial inspection revealed that the rotor had cracks on the radius section between the last stage disk and the gland seal area located on both the governor and the generator sides. As well-known experts in the repair of steam turbines, Sulzer was called in to resolve the problem. Despite several attempts to low speed balance the rotor at their premises, it still exhibited high vibration levels.ĭuring one of these off-site balancing procedures, the plant engineers discovered deep cracks that were suspected to have been caused by a previous repair by another service company. During the previous two years, the pre-existing maintenance provider had repeatedly tried to repair the turbine, but the vibration issue had persisted.
The Indonesian geothermal power plant had been experiencing some issues with one of its 60 MW steam turbines. This quick and effective repair also managed to achieve an 8% improvement in efficiency. Rather than wait for at least a year for a new rotor from the original equipment manufacturer (OEM), the plant opted for a repair that took only sixteen weeks. When a damaged steam turbine rotor needed to be repaired, a power generation plant in Indonesia turned to Sulzer.
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