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Glycol compatible expansion tank?

TTT, any help?


  • james patrick
    james patrick Member Posts: 70
    Glycol compatible expansion tank?

    I'm looking for a brand & model expansion tank that is compatible, long term, with proplyene glycol.

    I read in Modern Hydronic Heating p384 that Butyl rubber is slowly disolved by glycol. EPDM is compatible.

    I can't seem to find an expansion tank that has a 100% EPDM diaphragm.

    I also require that all components that touch the water be non-ferrous, brass, stainless steel, etc.

    Thanks for any help.

  • hr
    hr Member Posts: 6,106
    I've used

    Extrol or B&G brand tanks on PG glycoled systems for as long as I can remember. Amtrol (extrol) does recommend a potable water Therm-Trol for any system with non barrier tube. These are plastic lined tanks.

    As long as the glycol is maintained (ph checked) I don't think it will hurt the tank bladder. Glycols don't usually attack components until the ph drops due to over heating or the inhibitor package being depleted. From non barrier tube, for example. Check ph at least every other year, if not yearly.

    I don't know of any other "special" tanks. Check with Wessel or others that build glycol fill systems, these tanks surely are glycol compatiable :)

    hot rod

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  • james patrick
    james patrick Member Posts: 70

    Thanks Hot Rod!
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