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 compliance to Standard

Gas Turbine compliance to Standard

Gas Turbine compliance to Standard


I am auditing a gas turbine unit compliance to a standard (API 616), and item states :The governor for mechanical drive applications shall limit speed to 105% of rated speed.

I found that there is a trip setpoint a 110% of rated speed and no other details on the governor control range; Is there other mechanism to limit the speed to 105% other than tripping the unit? How should I interpret the standard?

RE: Gas Turbine compliance to Standard

not too familair with GTs, but with STs. The 105% limit sounds like either the high speed stop for the governor, or this could be the settling no load speed with the steady state regulationset to 5% from a full load rejection

RE: Gas Turbine compliance to Standard

I'm not reading the entire standard, but what I read in your post is that the governor is allowed to run to 105% with no action (no trip, etc.) Sounds like the trip is set 5% higher than the upper operating limit.


RE: Gas Turbine compliance to Standard


Unlike governing, Trip is a safety function. For turbines, trip function is provided by an independant system.Usually trip speed is set at about 105% of MCS. MCS is the "Maximum Continous Speed". MCS is at least 105% of the rated speed.

Operation above 105% is not menat to be continous. For most applications (power gen as well as mechancial drive) such a high speed operation may not even be meaningful. Operators would know something is wrong. The reason why the turbine is not tripped immediately above 105% is to avoid nuisance trips caused by the governor control overshooting beyond 105%.

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 – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. Download Now
White Paper – Collaboration in the PLM Context
The influence exerted by the Internet of Things (IoT) means that there is a steadily growing need for collaboration in industry. Partners from new industries and areas of application need to be integrated in cross-company business processes to ensure that the lifecycle of smart, connected products can be managed from end to end. 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