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


Gas Turbine protection information

Gas Turbine protection information

Gas Turbine protection information

Hallo everybody,

does anybody have or can recommend some document explaining the Gas or STeam turbine protection system, the possible avoided damages ? An example would be : what is the reason for tripping the Turbine, when I have low fuel gas temperature ? Do I get an unstable burning condition and do I have long-term blade-damage ?

Thanks in advance,

RE: Gas Turbine protection information

I only worked Steam but the principles would apply
the "rules" during that time for protection defined three levels;
1) could result in the loss of life
2) could result in loss of equipment
3) could result in increase maintenance

for level 1, events like over speed, the protection was redundant and testable
for level 2, events like loss of lube oil, the protection was manditory
for level 3, events like high vibration, the protection was recomended, but optional

maintaining unit availableity was a high (secondary priority). thus the trip protection was to ensure there was a real need to do so and not have conservitive tripping logic
the impression I get from today's controls with the ease of adding a program instruction is trips are becoming "if in doubt, trip it out"

RE: Gas Turbine protection information

Low fuel gas supply temp may be an indication that the FG has cooled down to become 2 phase vapor and liquid. Incomplete combustion of liquid condensate in the turbine resulting from slug flow in the feed piping and sudden accumulation of liquids in the combustion chamber could lead to a detonation and turbine damage. So a TSLL on FG supply is a machine and personnel safety instrumented barrier against such risks.

RE: Gas Turbine protection information

There is something more than that for change in fuel gas temperature.... normally combustion systems are designed for specific MWI (Modified Wobbe Index). MWI is measure of energy input to the combustion and is dependent on fuel gas temperature and Specific Gravity (In turn fuel composition and hence calorific value). Acceptable variation allowed is 5% from designed value.

General philosophy for protection is explained by @BYRDJ. You need to check the machine specific O&M manual where such things would be described.

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


White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. 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