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  1. #1
    Join Date
    Nov 2007
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    expansion tank location

    I have A cast iron boiler with pump on return side of system and bladder type
    tank before that, with spiro vent. is this ok? i Know it suggested that tanks be close to suction side of pump, but should there be room for expansion on supply side?

  2. #2
    Join Date
    Nov 2007
    Location
    Chicago
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    76
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    It is a closed system, so you just need to account for the expansion. You place the expansion tank on the suction side of the pump because that is where the lowest pressure is expected in the system. At the lowest pressure, the most air will come out of solution. That is why the air seperator or vent is placed there.

  3. #3
    Join Date
    Nov 2007
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    thank you. I guess most of the piping diagrams I have seen show pump and tank on supply side of boiler. I know many prefer this set up, any thoughts on that?

  4. #4
    Join Date
    Jun 2000
    Location
    N. W., IN
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    1,018
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    Spiro., tank, feed, pump all on supply works best.

  5. #5
    Join Date
    Jun 2006
    Location
    Richmond, VA
    Posts
    3,206
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    Quote Originally Posted by Ron View Post
    Spiro., tank, feed, pump all on supply works best.

    I don't work on very many, but why is it better on the supply side?
    I wish I had a $1.00 for every response I deleted.....

    "Decidedly Superior in a twisted pathetic way".....

  6. #6
    Join Date
    Nov 2007
    Location
    Chicago
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    76
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    It is better on the supply side so you get the highest temperature along with the lowest pressure for air removal.

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