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Corrosion on heat lines at boiler

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pcgodaire
pcgodaire Member Posts: 1
in THE MAIN WALL
Four years ago we installed/modified piping at a boiler to add radiant zones. I got a call from the owner that they were seeing some corrosion on some of the piping. We used black steel pipe and added some brass ball valves. The corrosion is only happening on the boiler side of the valves. Any idea why this is happening. See pictures attached.

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  • SWEI
    SWEI Member Posts: 7,356
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    What's the water chemistry like? Is there an auto-feeder in use?
  • hot_rod
    hot_rod Member Posts: 22,216
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    What type of tubing was used for the radiant? Non-barrier or plumbing pex allows O2 into the system and thus supports corrosion.

    But it also looks like a basic leak on the threads.

    Checking water quality is always a good idea.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    RobGkcopp
  • RobG
    RobG Member Posts: 1,850
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    I agree with Bob, it looks like a thread leak. If the bottom of the valve was done like the top it looks like not enough thread sealant was used.
  • Aaron_in_Maine
    Aaron_in_Maine Member Posts: 315
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    It has had a small leak from day one.

    There was an error rendering this rich post.

    KC_JonesBob Bona_4
  • ericmf
    ericmf Member Posts: 3
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    Packing nut behind handle
    Wire brush and spray paint
  • Bob Bona_4
    Bob Bona_4 Member Posts: 2,083
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    I don't see any evidence of thread sealant, of any kind.

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