Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Turbine Blade broken

Turbine Blade broken

Turbine Blade broken

Can any body explain me that what will happen if some blades of turbine get broken? and how can we detect if some blade is broken or not?

RE: Turbine Blade broken

a broken turbine bucket (blade) will be IMMEDIATELY seen as a journal bearing vibration increase. for any turbine stage, with a possible exception of the last stage, there will be resulting colaterail damage to other buckets.

FORCING a turbine back into service with a minor broken bucket will result in harmontics and cause breakage of other buckets with few hours of operation thus being major damage

RE: Turbine Blade broken

You should provide more information on the type of turbine you are interested in. We have overhauled a multi-stage steam turbine and found a broken blade in the last stage. We believe that this break had occurred months or even years ago. There was no clear evidence in the vibration. But, it was a very small piece broken off relative to the size of the blade and the weight of the rotor.

Johnny Pellin

RE: Turbine Blade broken

@JJpelim i am interested about steam turbine blades. In your case breakage is very little but if 2 or 3 blades get broken then i think vibration is only phenomenon from where we can get information

RE: Turbine Blade broken

You still have not provided information on the turbine involved. For the turbine that I referenced, the loss of two blades on any stage would certainly result in the turbine tripping off on high vibration. If the turbine did not trip off for some reason, I would expect a bearing failure. Are you proposing placing a turbine back into service with missing blades?

Johnny Pellin

RE: Turbine Blade broken

John, does your photo show that damaged bucket? I can't find it,
could you give location

RE: Turbine Blade broken

Keep in mind that vibration is a vector, consisting of an amplitude and a direction. If a small portion of a blade is lost and if the location of that damaged blade is 180 degrees from the vibration vector before the loss, there is a change in the vibration vector. However, the amplitude portion of the vibration vector may not increase, or could decrease, since the new vector is 180 degrees away from the original vector.

Best of luck!

RE: Turbine Blade broken

I cannot find a picture that shows the broken blade from our turbine.

Johnny Pellin

RE: Turbine Blade broken

We observed the same phenomenon of cracks in last stage of reaction turbine. Plants is tripped on high vibration if there occurs turbine dynamic imbalance due to breakage of blades. Vibration of journal bearings across turbine rotor is mirror for turbine behaviour.

RE: Turbine Blade broken

in reaction turbine when a small blade fails the rotor vibration could stay at low value without noticeable event.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close