Trouble Shooting Vibration Upon Steam Turbine Start-Up 2

[dialindicator]

Say you have started up a steam turbine and you experience high vibration. You want to get on line as soon as possible. What would you check out first? What steps would you take to identify & solve the problem? I worked as a field engineer some time ago, would like to return, & I am trying to remember various scenarios that can occur. Thanks in advance for your help..

 

[metengr]

The most important would be to understand where and what type of vibration mode is occurring during start-up of the machine. My only experience is in steam driven boiler feed pumps and large steam turbines. The location of the vibration and interpretation are critical to deciding what to do.

I would suggest you re-post this question in the forum below
forum384

 

[byrdj]

Due you have a company you are looking at while trying to get back into FSE. The company I'm with needs FSE with experance from all manufactures.

That question needs a lot of discussion. since I do the controls just prior that is sometimes my job. I always question the guy that put it together to see where there migh have been a probelm
like inner shell distortion
new or newtype packing, and how it was set.
alignment as found and any changes (I had oil whip put back in machines since no one checked to see why a bearing elevation was not per 1950's instalation specs

More than likely the above will cause rub and will need "rolling machining and hammering".
If rub is subspected, might rub out at subcritiacl hold or might go thru and came back down hard.

No matter how hard plant wants you to install a correction, you can not balance out a rub. thus repeatable vibration (phase and magnitude) must be obtin before a shot is called.

If bucket or field work was done, then it could be unbalanced and you might have to call a shot from sub synchronis data.


Your question was "want to get on line". I had one situation where the customer (forign goverment) said "put it on". thus lifted trips, defeated accelration control and ran for 18 hours before the l-1 finished coming off.