A 4400 rpm high temperature steam turbine vibrates intermittently. The fouling/coking of the oil labyrinth is suspected as origin. If this is the case and after confirmation, it is possible to clean the deflector with the turbine in normal operation by means of a special high-pressure cleaner (steam or water). Do you have such an experience, result? Could the rotor start vibrating? The small quantity of water entering the lube oil system should not be a problem (short time operation).
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