×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Failure of turbine blades

Failure of turbine blades

Failure of turbine blades

(OP)
There are two identical turbines operating in India of 16.5 MW rating since 1977. In one turbine, turbine blades have failed five times while there is no failure in the other. The blade's strenght and other testing were carried out but no abnormality was observed. Normally, one turbine is in service and other turbine is on stand by. This is a back pressure turbine which supplies steam to the process of a chemical industry. There are two extraction lines, one is controlled extraction and other is un controlled extraction. Extraction steam going to the HP and LP heaters. HP and LP heaters and deareator are common for both the machine. What could be the reasons of frequent failure ? Is it is process oriented or manufacuring related ? Kindly reply
(A.K.Sinha)

RE: Failure of turbine blades

Dear Mechanical Engineer,
What is the failure type?
What is the operating scenario in terms of turn around?
What is the piping lay out?  Any differences?

These are just questions that you may start find reasons through the course of investigation.

Take Care

RE: Failure of turbine blades

Mr. Sinha
Are these variable speed mechanical drives for compressors/pumps or are they generator drives? Which turbine stage failed in the five failures? Have the failures been confirmed to be due to high cycle fatigue? Does the unit that fails have either much more standby or operating time?
fkushner@elliott-turbo.com

RE: Failure of turbine blades

(OP)
Dear Mr. Franko,
Thanks for your response.
This machine is not variable speed drive.
In this machine, there is a single rotor having HP and LP section.
There are 15 reaction stages and one curtis stage in LP section. Failure is taking place after curtis stage. There is one extraction line after curtis stage.
Yes the unit in which failure take place mostly remain on stand by.

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!


Resources