Galvanizing on vent pipe flaking off

Discussion in 'HVAC' started by Andy Energy, May 18, 2008.

  1. Andy Energy

    Andy Energy Guest

    I just tested a water heater with a stack temperature or 526 deg F.
    About 3 lineal feet of vent pipe above the vent damper had pealing
    galvanizing. There does not appear to be any corrosion on the vent
    pipe. Is the pealing due to the stack temperature being too high?

    See Pictures at: http://picasaweb.google.com/AndyEnergyWHP/GalvanizingOnVentPipeFlakingOff

    Andy
     
    Andy Energy, May 18, 2008
    #1
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  2. Andy Energy

    Dr. Hardcrab Guest


    526 degree stack temperature??!!

    Must be one of those new-fangled high efficiency units......
     
    Dr. Hardcrab, May 20, 2008
    #2
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  3. Andy Energy

    KJPRO Guest


    Plugged chimney no doubt...
    Guess where all the CO is going! :(
     
    KJPRO, May 20, 2008
    #3
  4. Andy Energy

    Andy Energy Guest

    Standard water heater about 3 years old
     
    Andy Energy, May 20, 2008
    #4
  5. Andy Energy

    Andy Energy Guest

    I doubt the chimny is plugged, I did a smoke test and vent pressure
    and both passed.
     
    Andy Energy, May 20, 2008
    #5
  6. Andy Energy

    KJPRO Guest

    I doubt the chimny is plugged, I did a smoke test and vent pressure
    and both passed.



    So, are you saying the 526 degrees doesn't bother you?
     
    KJPRO, May 20, 2008
    #6
  7. Andy Energy

    ftwhd Guest

    Do you think that temp is the net temp? I dont.
     
    ftwhd, May 20, 2008
    #7
  8. Andy Energy

    Andy Energy Guest

    I have a Bachrach mod 60

    The temp and CO was taken just inside the top of the flue in the tank
    before the vent damper.
     
    Andy Energy, May 22, 2008
    #8
  9. Andy Energy

    Andy Energy Guest

    Please define net temp, I've never heard of this term.
     
    Andy Energy, May 22, 2008
    #9
  10. Andy Energy

    Andy Energy Guest

    I do not know where you got this idea that the 526 degrees does not
    bother me. I'm a believer of condensing water heaters with the
    exhaust being close to the inlet water temperature.

    Too bad lesser efficient models are allowed to be made.
     
    Andy Energy, May 22, 2008
    #10
  11. Andy Energy

    KJPRO Guest

    I do not know where you got this idea that the 526 degrees does not
    bother me.



    WHY don't you ask about the temp issue?
     
    KJPRO, May 22, 2008
    #11
  12. Andy Energy

    KJPRO Guest


    What does 9 months of winter have to do with the efficiency of heating
    potable water?
     
    KJPRO, May 22, 2008
    #12
  13. Andy Energy

    Andy Energy Guest

    When it comes to the cost to society, the higher efficiency units are
    the right thing to do.
     
    Andy Energy, May 28, 2008
    #13
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