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    non ferrous circs for non-oxygen barrier radiant? (2 Posts)

  • paul paul @ 4:31 AM
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    non ferrous circs for non-oxygen barrier radiant?

    Recently isolated a 1990's butyl rubber radiant system from the boiler using stainless HX.  Original Grundfos 15-42 cast circs were still running, two now have failed - old boiler was a electric thermal storage unit - 800 gallon tank.  Will new cast circs (grundfos 15-58) have a chance of living a long productive life as the 15-42 did or should we insist on using stainless circs?  Now that the circs are the only iron part on the radiant side of the HX, will they degrade faster?
  • Oxygen

    Oxygen will deteriorate the cast iron circulators on the radiant side if the tubing is non-barrier.  Replace them with bronze or stainless steel.  
    Often wrong, never in doubt.
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