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


Turbodetander (turbine) start-up issues

Turbodetander (turbine) start-up issues

Turbodetander (turbine) start-up issues

Hello dear fellow engineers!
My name is Gulmira.
Currently we are working on starting up the Cryogenic Nitrogen Unit.
Completed exceptional ReGex and deriming steps. Started up Turbine, but cannot reach the required RPM (42000) on the turbine. Blades are open to 50%, inlet gas Pressure 4.8 bar, RPM=32000. When turbine blades opened more, RPM increases sharply and then decreases again to lower level, also gas inlet pressure decreases to 3 bar.

because of that Liquid N2 is not collected in evaporator to start producing gaseous N2

Please help, what can be a problem?
one of the options is that gas flowrate is not enough, What else can be a problem?
will so much appreciate your help!

RE: Turbodetander (turbine) start-up issues

You could try another tactic also by changing the operating conditions on the brake side of the expander to bring the expander up to speed - if you push the operating point on the brake side compressor(?) up the Q-h curve, it should increase turbine speed.

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!


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