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Vibration in system

Paul Pollets
Paul Pollets Member Posts: 3,662
in THE MAIN WALL
If you're using a large 3pc. circulator pump (B&G #100) the motor mounts may be shot. I'd recommend replacing the pump with a wet rotor pump (Grundfos or Taco) which is much quieter and uses less electricity. Often the piping in older systems touches the framing without isolation hangers, and transmits vibration throughout the home.

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  • John A. Byerly
    John A. Byerly Member Posts: 2
    Vibration in system

    Hi,

    We have a hot water boiler system with large cast iron radiators. Our house is 3 stories. Recently, I had to drain the system and recharge the diaphram expansion tank, which I charged to 15 lbs. I filled the system and bled the radiators and fired it up.

    When the circulating pump kicks on, it vibrates. This caused noise throughout the house until I separated the pipes that were rattling together. However, I still have a rattling sound in one area of the house. I am convinced this is not due to pipes rattling against each other since it is inside a wall. The noise seems to come and go, and seems to go away if I open a bleed valve during a heat cycle.

    Is it possible that this is water hammer? Do I have too much pressure in my system? There is no water leaking anywhere.

    Also, is it normal for a circulating pump to vibrate? If not, would it be more likely that the pump or the motor is vibrating?

    Thanks for any help. The noise is keeping me awake at night!

    JAB
  • John A. Byerly
    John A. Byerly Member Posts: 2


    Thanks for your response.

    The pump is indeed a B&G pump. I couldn't tell the model number.

    I was able to separate the pipes that were rattling together, which was the source of much of the noise. The remaining noise is intermittant and is located in a room that is just about the farthest point from the boiler. Literally, you can barely hear it one floor above or below. That was why I wondered if it was a water hammer problem.

    Is 15 lbs. a good pressure for a hot water system such as ours (3 story house)? I was afraid that I might have the pressure too high.

    Thanks!

    JAB
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