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soot

Boris,

See the attached DOE document regarding soot in boilers.


Ed Carey

Comments

  • borisboris Member Posts: 3
    how much does soot insulate?

    I think I remember hearing that xxxx thickness of soot equaled a 1/2 or inch of fiberglass insulation. I don't remember exactly OR if its true but I was very impressed that it was important to keep yer boiler heat exchangers clean.
    Anyone know? AND

    If you had a boiler that burned 2,000 gals of oil, would you do a mid season brush down?
  • Robert O'BrienRobert O'Brien Member Posts: 3,188
    how much does soot insulate?

    A lot! Why would you tolerate an oilburner that produced soot in the first place?

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  • Leo_12Leo_12 Member Posts: 17
    nine percent

    I once read that an eight inch of soot reduces heat transfer by nine percent. Now soot is carbon, unburned fuel. Another thing I see form is sulphur, scale, and ash the percentage that affects heat transfer I don't know. A properly tuned burner that doesn't goof up (anything mechanical can goof up)does not make soot. (not referring to early burners still in service) Using prepurge and clean cut pumps on oil burners makes a difference. Proper piping for the particular installation can affect ash and scale by it's affect on the flue gasses condensing. If a burner stays warm or if it is used for an indirect water heater year round all affect how clean things stay. Different brand burners burn better in different boilers than others. But if a burner is "properly" serviced once a year it should run to it's full potential.

    Leo
  • Al Letellier_9Al Letellier_9 Member Posts: 929
    ssot value

    My old school notes tell me that 1/8" of soot has equivilant R value of 1" of fiberglass. That what I have used for years.

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  • Bob HarperBob Harper Member Posts: 822
    flow

    soot build up reduces the effective flue area thus hindering flow. The insulative effects of soot vary with the composition of it as soot is not uniform. When a unit fires up from a cold start, it takes longer for the flue walls to heat up and maintain a stable draft. However, in most cases, it is the flow performance that is of more concern. The standard recommendation is to sweep the flue whenever there is a 1/4" buildup. However, with smaller flues, a little buildup has much more effect. Remember, when you double a diameter, the flow increases to the cube function so the same in reverse as you reduce a flue. A little reduction in diameter reduces flow a lot. Just compare sizes in the venting tables.
    Bob
  • Edward A. (Ed) Carey_3Edward A. (Ed) Carey_3 Member Posts: 236
    See attached DOE document re soot

    Boris,

    See the attached DOE document regarding soot in boilers.


    Ed Carey
  • Edward A. (Ed) Carey_3Edward A. (Ed) Carey_3 Member Posts: 236
    See attached DOE document re soot

    Boris,

    See the attached DOE document regarding soot in boilers.


    Ed Carey
  • Edward A. (Ed) Carey_3Edward A. (Ed) Carey_3 Member Posts: 236
    Soot information

    Boris,

    See the attached DOE document regarding soot in boilers.


    Ed Carey
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