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Reliability Question

Reliability Question

(OP)
Our reliability group would like to use their "Vibration measurement tools" to make shim movements on energized running equipment if they discover soft foot on a electric motor or steam turbine, Is this a industry standard? I'm told it is at one bolt one shim movement at a time until they correct the problem. I would like as much input on this subject as possible, We have concerns.

RE: Reliability Question

Was the other post (with possible replies) removed?

RE: Reliability Question

(OP)
No replies of yet. Has anyone done shim movements on energized rotating equipment or allowed it to be done to remove soft foot and how did it work out?

RE: Reliability Question

Are they adjusting it while it is actually moving?

"Formal education is a weapon, whose effect depends on who holds it in his hands and at whom it is aimed." ~ Joseph Stalin

RE: Reliability Question

Is "soft foot" determined by actually measuring a gap or taper or vertical motion of the machine foot?
/// Or ////, inferred when vibration changes when the hold down bolt is loosened or tightened?

What is the frequency of the vibration being monitored and attributed to soft foot?

There have been a raft of discussions by practical folks about real-time hold down bolt loosening on a variety of machines over here -
http://www.maintenance.org/forum/posts-about-vibra...

I don't think any equipment manufacturer would condone it, if only for liability concerns.

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