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chimney vibration

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by nrcrash, Nov 7, 2012.

  1. nrcrash

    nrcrash Member

    Joined:
    Apr 17, 2012
    Messages:
    155
    Loc:
    MA
    After I fire up my Vigas 40, while flue temp is increasing between 220- 270 degrees (approximately). I get a deep humming sound. I installed a barometric damper because I though this would help but it continues to do it. Wasn't sure if this was normal if it is something I should be concerned with.....

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  2. maple1

    maple1 Minister of Fire

    Joined:
    Sep 15, 2011
    Messages:
    3,657
    Loc:
    Nova Scotia
    Humming?

    Or rumbling?

    Gassification produces a rumble - I kind of like it. :)

    (That's the way it is here - so I hope it's normal...)
  3. JP11

    JP11 Minister of Fire

    Joined:
    May 15, 2011
    Messages:
    1,095
    Loc:
    Central Maine
    I've gotten a similar sound. I always thought it was right around when gasification starts. BUT... in my case I thought it was from the cardboard I'm using (wife's business generates a ton) was really roaring.

    don't know

    JP
  4. Nofossil

    Nofossil Moderator Emeritus

    Joined:
    Oct 4, 2007
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    3,398
    Loc:
    Addison County, Vermont
    I've had what I think you're describing. Happens on startup when there's a vigorous fire in the upper chamber and you switch to downdraft operation. I *think* what's happening is the flame front is switching from above the nozzle to below the nozzle, back and forth. This gets the air column in the chimney vibrating like a giant pipe organ. Not a gasification rumble - more like the helicopter of doom hovering over your chimney.

    Increasing fan speed and/or primary air seems to solve it in my case.
  5. BoilerMan

    BoilerMan Minister of Fire

    Joined:
    Apr 16, 2012
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    1,524
    Loc:
    Northern Maine
    I liked the Helo of doom thing.............. LOL great explination!

    TS

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