a new noise after installing an expansion tank

Discussion in 'Pumps and Tanks Well Forum & Blog' started by jlp, Feb 28, 2013.

  1. jlp

    jlp New Member

    Messages:
    4
    Location:
    missouri
    I had a hot water tank blow it seam somewhere it was leaking or should I say poring water out of the outer jacket. It was covered under warranty. but i chose to install an expansion tank on the cold water inlet of said water heater, now I have a rumbling noise when I run water and the pressure fluctuates. How can I stop the madness?
  2. valveman

    valveman Moderator Staff Member

    Messages:
    4,383
    Location:
    Lubbock, Texas
    Let some air out of the expansion tank.
  3. jlp

    jlp New Member

    Messages:
    4
    Location:
    missouri
    that did not help
  4. valveman

    valveman Moderator Staff Member

    Messages:
    4,383
    Location:
    Lubbock, Texas
    OK, then you need to check the air pressure in the tank. Turn the water off to the house and open a faucet to drian house. Then check tank air pressure with a car tire gauge. You need about 30% less air pressure than the lowest water pressure you see in the house.
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