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Thread: Replacing Thermal Expansion Tank

  1. #1
    DIY Junior Member
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    Default Replacing Thermal Expansion Tank

    Howdy!

    I'm replacing my 2 gal. thermal expansion tank due to a pin hole leak.
    I've charged the new one per the mfr's directions.

    When I went to pull the old one off, it wouldn't budge.
    I just used a wrench on the hex end of the pipe, and another wrench on the hex of the tank.
    I'm afraid of using too much force and busting the pipe it hangs on.

    Any tricks I might try?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    If you grab the pipe properly, it will NOT break off no matter how much force you apply to the tank.

  3. #3
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    Heheh... this begs the question - what's the right way, and what are the many wrong ways? Thanks for the input!

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    You may need two wrenches...hold the one wrench on the threaded T while using the other one on the tank. the goal is to prevent excess torque on the pipe and fitting. I've only replaced a couple, but they spun off without tools without problems. Teflon tape verses pipe dope may make that easier when the time comes, or both.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    Master Plumber Redwood's Avatar
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    Quote Originally Posted by epdmcoatings View Post
    You should call some plumber, He will decide better for you what to do with this problem.
    Mmmm great advice! Tasty Fried Spam Sandwiches...


  6. #6
    DIY Junior Member gabby's Avatar
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    I bought a new expansion tank but it had no direction in it. It was the last one they had at HD an it had been open. Do these things need a charge per the mfr's directions?
    Also mine is full of water so it is going to be a mess when I remove it. At present it is laying over on its side full of water. I guess the bladder inside must have gone bad.

  7. #7
    DIY Junior Member gabby's Avatar
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    Is there no pressure on these things when you remove one of them? Sort of scary removing it.
    Mine is laying over on its side full of water.

  8. #8
    Forum Admin, Expert Plumber Terry's Avatar
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    When you turn off the water and open a hot tap, that will relieve the pressure.
    The pressure in the tank should match the incoming water pressure.

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