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@Registered Member posted:

If there is no rubbing, particularly blade rubs, try putting it on turning gear (or jogging).

Dear william

We have done bore scope check no sign of rubbing seen. How should be condition of turbine before put on  turning gear?i mean hot or cold start ?i think we need some hot  start and stop and putting on  turning gear between each step to get better result .but  we don't have specific procedure based on GE vendor .

Thanks for sharing your comment     

RM

If you have been down since the time this was posted, this would be a cold start. Borescope cannot see all places that the turbine can rub; on gear you may be able to hear a rub--you might go in the exhaust or inlet (if it is not deafining). Not seeing any rubs, is a good sign to place the unit on turning gear (jogging, whaterver you have). (Once someone described to me the rubbing sound on a turbine as whales mating--I wonder how they knew.)

You do not have a specific procedure from the vendor. Have you made an official inquiry?

RM
@Registered Member posted:

If you have been down since the time this was posted, this would be a cold start. Borescope cannot see all places that the turbine can rub; on gear you may be able to hear a rub--you might go in the exhaust or inlet (if it is not deafining). Not seeing any rubs, is a good sign to place the unit on turning gear (jogging, whaterver you have). (Once someone described to me the rubbing sound on a turbine as whales mating--I wonder how they knew.)

You do not have a specific procedure from the vendor. Have you made an official inquiry?

We  haven't made any inquiry. We just referring to operating manual which mentioned if your shaft suspected to rotor bow , turning at least one hour  turning gear . We have done it but vibration has not  decreased . Can we conclude bended shaft or permanent bowing ? 

RM

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