Reliability Question 1

[BoilingCrude]

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.

 

[IRstuff]

Please refrain from multiple posting

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[Tmoose]

Was the other post (with possible replies) removed?

 

[IRstuff]

Not that I can see. The OP posted in 3 forums with the same question; all still are there

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[BoilingCrude]

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?

 

[IRstuff]

You're posting on a weekend, so I'm not sure why you expect any sort of quick response

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[Panther140]

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

 

[Tmoose]

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-vibration-alignment-balance

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