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VibGuy~5

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Posts: 75
Reply with quote  #31 
To close this one out, they looked at my idea of turning down bolts with horror.
Instead, they did a double lock down and bleed of the pipework, loosened the motor, pump and pump flange bolts (no flexible connectors). Allowed everything to float with the alignment gear on and adjusted the train (with a bigger hammer) and then tightened everything down when the alignment was good.
Lastly, they tightened up the flange.
Vibration reduced from a high of 22 mm/s to 2 mm/s.
All good? I'm not sure-I wasn't there when it happened, but I'll be keeping a close eye on the flange for leaks-I'll let you know.
fburgos

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Reply with quote  #32 
hammer and alignment shoulnt be in the same sentence
VibGuy~5

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Posts: 75
Reply with quote  #33 
Okay, large plastic mallet and alignment (but hammer & alignment is almost poetic[biggrin])
JuddJones

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Reply with quote  #34 
Without being there it is difficult to say, but it sounds like they traded pipe strain for misalignment.
Danny Harvey

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Reply with quote  #35 
Big J nailed the trade off.

That's why we don't move pumps here.  We have to use necked down bolts quite often at our one big contract, but most of the pumps have already been installed using chain wenches and flexible connectors are distorted from 3/4" offest misalignment between pipe flanges that is left.  They all have mechanical seals too. Loosening the pump bolts is the figurative "can of worms" that just shouldn't be opened unless there are pipefitters standing by.
JuddJones

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Reply with quote  #36 
Quote:
Originally Posted by Danny Harvey
Big J nailed the trade off.

That's why we don't move pumps here.  We have to use necked down bolts quite often at our one big contract, but most of the pumps have already been installed using chain wenches and flexible connectors are distorted from 3/4" offest misalignment between pipe flanges that is left.  They all have mechanical seals too. Loosening the pump bolts is the figurative "can of worms" that just shouldn't be opened unless there are pipefitters standing by.

Danny is reading my mind. I have used necked down bolts on pumps hundreds of times, never had an issue. I wouldn't use them on a motor driving a gearbox, but a pump it works fine if you use common sense.
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