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Thread: New punp, tank, plumbing, and... vibration.

  1. #1
    DIY Junior Member stoneaxe's Avatar
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    Default New punp, tank, plumbing, and... vibration.

    We had our submersible pump, motor, drop pipe, line to the well house, and tank all replaced. you can see the thread I started about it here-
    http://www.terrylove.com/forums/show...light=stoneaxe

    50' well, 35' water level, Grundfos 10 gpm pump and 1/2 hp Franklin motor, 1" schd 120 pvc drop pipe, 1"poly from the well to the tank.
    One check valve, one anti -torque rubber device.

    The system had a vibration in it, we could hear and feel it in the plumbing-touching a faucet, or copper line.

    The well guy came out and pulled the pump and motor. We took apart the pump and motor and I did note the pump shaft did not have a smooth rotation- it went from free and easy to quite sticky- also the motor was pulling a little more than the normal max amperage.

    He replaced them with Grundfos 1/2hp motor and pump the second time.

    The vibration is much less, but still present.

    Is this something to be concerned about?
    Last edited by stoneaxe; 01-23-2014 at 11:12 PM.

  2. #2
    Moderator valveman's Avatar
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    I don’t see how you are getting vibration from the pump with poly pipe underground. The poly should be flexible enough, like a rubber hose, to keep vibration from transferring.

    You may have a resonance problem. Sometimes just adding or taking away a couple feet of the drop pipe in the well will solve this problem. If the drop pipe is exactly the same length as the resonance frequency, it works like a tuning fork. Making the pipe a little longer or shorter changes the tuning frequency.

  3. #3
    DIYer, not in the trades LLigetfa's Avatar
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    Quote Originally Posted by stoneaxe View Post
    One check valve...
    Is this one in addition to the one built into the pump and if so, where is it?

  4. #4
    DIY Junior Member stoneaxe's Avatar
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    Quote Originally Posted by LLigetfa View Post
    Is this one in addition to the one built into the pump and if so, where is it?
    Yes, it is either 20' or 40' above the pump, where two 20' sections of drop pipe join. I cannot remember which. There are two 20' sections and a short 5' or so section.

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