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Vibration Dampening

Vibration Dampening

Vibration Dampening

(OP)
I have a project in which I am trying to dampen the vibration from a circulation pump that circulates water around a tub at a noise level of 85-92 db.  The total weight of the tub, liquid and contents is 9,071 lbs over an area of 4'8" x 9'-7".  I can't use spring isolators due to space restrictions.  I would like to find a pad type isolator that can be laid between the steel frame work and the tub frame.  

Years ago I used an ethafoam product that was about 2" thick as a pad isolator, but I haven't been able to find any design information on that material.  Does anyone know of any similar material, with documented design characteristics, that might work and where I can get it?
 

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