A friend of mine just moved into a new house with a shallow well and 1 1/2 HP pump. The problem is, he hears the pump resonate through the whole house when it's on, enough to wake him at night. What's going on? How do you short circuit the noise? Met.
I know exactly what's going on. It's a common mistake that installers of jet pumps often make, and it causes cavitation until the pump gets primed well. See this pic and see if the piping arrangement isn't like one of the bad examples:
If it's not cavatation, look for bearings or out of balance impeller or trash in the LP side. A pipe resting a thin piece of siding which then acts as a diaphram to transfer movement into noise. And many moons ago, a pin hole leak in the intake side, cause a series of call backs.
the noise may not be the problem, just a symptom. I think "shopdust" is right, if the bearing are worn this will cause all sorts of vibration. also, if it isn't a problem with the pump it could be that the pump is installed too rigid and the vibrato is carried thru out the house and then amplified as the wave gets wider, like a ripple in a pond. rubber and cork vibration pads can be used to absorb some other the viration, but a better product is brass braided vibration eliminators installed on both the inlet and outlet of the pump. the pump can literally dance around and the rest of the system won't feel it.
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