Noise from pressure tank

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by Irish Mtn, Jul 30, 2016.

  1. Irish Mtn

    Irish Mtn New Member

    Joined:
    Jun 17, 2015
    Location:
    Ontario
    I just installed an entirely new cistern-fed 40/60 system and immediately have a cavitation noise, which gets louder when the pressure builds past 55psi. The fill cuts off at 59psi, but drops a point or two after. The tank refill takes 40 seconds, which is faster than I'd like. Video is posted here

    https://www.dropbox.com/s/mlrrq01sg8cikt9/well tank noise.wmv?dl=0

    Examples from other posts suggest a defective diaphragm, but the pre-charge at 38psi checks out OK and it holds. It's a Flexcon WWT35 (33gal) which is under warranty, but before contacting them is there anything else it could be?

    Cistern pump is a sleeved Grundfos 10S05-6 located 80' away from house with 1" poly pipe. Perhaps a 10gpm dole valve should be added? Drop down to 30/50?
     
  2. Smooky

    Smooky In the Trades

    Joined:
    Apr 4, 2011
    Location:
    North Carolina
    It might be the check valve
    check valve chatter
     
    Last edited: Jul 30, 2016
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  4. Irish Mtn

    Irish Mtn New Member

    Joined:
    Jun 17, 2015
    Location:
    Ontario
    I see. So check valve at the tee is unnecessary because there is a check valve in the pump?
     
  5. Smooky

    Smooky In the Trades

    Joined:
    Apr 4, 2011
    Location:
    North Carolina
    It is done both ways. Many people instal them at the tank without a problem. I don't know why it would be chattering. It may be oversized, or damaged? Maybe sombody else will know.
     
    Last edited: Jul 30, 2016
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Your dropbox link asks for a sign-in.

    I would remove the check valve at the pressure tank tee, or remove its insides.
     
  7. Irish Mtn

    Irish Mtn New Member

    Joined:
    Jun 17, 2015
    Location:
    Ontario
    Dropbox asks for sign in, but you don't have to do it. Just click the X in the top right corner. I will remove the checkvalve. Thanks
     
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