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Non Oxygen Barrier Pex used in heating system

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Joseph_4
Joseph_4 Member Posts: 278
I'm on a job where the previous contractor piped in a radiant zone under poured concrete using non oxygen barrier pex. What problems if any may arise?
Thanks
Joe

Comments

  • GBart
    GBart Member Posts: 746
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    Total corrosion of everything, oxygen causes oxidation.
  • Joseph_4
    Joseph_4 Member Posts: 278
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    what it allows oxygen to get into the system or out or both?
    Joe
  • nicholas bonham-carter
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    Oxygen enters the system through the Pex, and starts its evil work. Isolate that piping with a heat exchanger.—NBC
    Rich_49
  • hot_rod
    hot_rod Member Posts: 22,334
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    Isolate any ferrous components away, steel pipe, cast iron circulators, etc. A plate HX with a stainless circ and lined expansion tank on the tubing side, steel and iron is fine on the boiler side.

    Or the entire piping out of non ferrous, boiler, pipe, circulator, fittings and devices.

    Or a O2 chemical treatment, checked and boosted as needed.

    Unfortunately systems are still promoted sold with non barrier tube, and open systems. But it can be salvaged.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Joseph_4
    Joseph_4 Member Posts: 278
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    Appreciate the input thank you!