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!

*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.

Jobs

Foundation Settlement Tolerance for Rotating Machines

Foundation Settlement Tolerance for Rotating Machines

(OP)
Our firm has been designing block foundations for combustion gas turbine and steam turbines (either pile supported or on-grade) for a settlement tolerance of 1/4". However most soils reports I see arrive at allowable bearing pressure recommendations based on 1/2" of overall settlement. I'm wondering though whether the machine tolerance being used at our firm is overly stringent, as I'm not able to locate the basis to support it in our company materials. Does anyone in this forum have experience in the settlement tolerances required for CTG and STG machines?

Steve

RE: Foundation Settlement Tolerance for Rotating Machines

???

Commercial powerplant gas turbine bearings are set (tuned) to the 1/10's of a thousandth of an inch and-to-end: Generator bearing, generator bearing, GT inlet, GT middle, GT outlet. Are you sure you're accepting 1/4 movement of the pedestals the GT's are sitting on?

Or are these so small that the whole thing sits on one foundation?

RE: Foundation Settlement Tolerance for Rotating Machines

(OP)
Sorry that I wasn't more clear about the scope of projects. We design foundations for small CHP power generation equipment. 10MW to 50MW machines mostly. And yes, the foundations designed are primarily single unit mass substructures supporting an entire machine.

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


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