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marksl

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Posts: 150
Reply with quote  #1 
Hello,

Does anyone know what class an electric motor fitted to a vertical multi-stage pump would fit into on the ISO 10816 vibration severity chart?
Dan Timberlake

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Posts: 116
Reply with quote  #2 
Is this to be included as part of a purchasing specification, setting alarms on a new program, or evaluating some new as-found measurements ?

Even the "flexible" foundation support modifier may be mild.

Overall  velocity readings can be useful to set off the smoke alarm, but are just about useless for diagnostics.
Maybe worse, if there is a bunch of 1X velocity ( virtually a certainty with a vertical pump ) then the ball/roller bearings can begin softly chattering and squeaking like chipmunks and the overall reading will barely budge.
John from PA

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Reply with quote  #3 
I suggest you download the PDF at http://europump.net/uploads/Guidelines%200n%20Pump%20Vibration%20First%20edition%20Final%20July%202013.pdf and then check the section relative to BS ISO 10816-3 (bottom of page 7) and BS ISO 10816-7 (page 8).
marksl

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Posts: 150
Reply with quote  #4 
Quote:
Originally Posted by Dan Timberlake
Is this to be included as part of a purchasing specification, setting alarms on a new program, or evaluating some new as-found measurements ?

Even the "flexible" foundation support modifier may be mild.

Overall  velocity readings can be useful to set off the smoke alarm, but are just about useless for diagnostics.
Maybe worse, if there is a bunch of 1X velocity ( virtually a certainty with a vertical pump ) then the ball/roller bearings can begin softly chattering and squeaking like chipmunks and the overall reading will barely budge.


Hi Dan,

Information is required for exception testing of a new installation of 4 vertical multi-stage pumps. I'm only interested in testing the motors as most of the pump is 10m below the ground and inaccessible.

The customer has requested exception testing only he is not interested in analysis


Dan Timberlake

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Posts: 116
Reply with quote  #5 
Hi Marksl,

There should have been some specs as part of the back and forth purchasing process.

At the very least I'd bet the pump supplier included something in their quotation.  Might be hidden in the boilerplate.
Trying to hold them to any other spec after the fact will not likely get far.
Nor should it, really, as it is a contract.

The now prehistoric Hydraulic institute had specs for measuring vertical pumps up near the top of the motor. The 1x limits were strongly dependent on the height of the pump. Logically, in my opinion.

The excellent ISO based link by John from PA reflects the height effect to some degree.  
In my experience ISO vibration specs were not always so pragmatic.
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