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Blast tube deterioration and CO

I thought that, normally, carbon monoxide is generated by lack of combustion air or flaky fire-side heat exchange surfaces. After correcting both in a Weil McLain model 578 low pressure steam boiler, CO remained over 2,000 PPM. So I pulled the burner to find that part of the end of the blast tube had been burned away. What would have caused this? Could the condition of the end of the blast tube cause high CO?


  • Steve Minnich
    Steve Minnich Member Posts: 2,650
    Was the boiler over-firing? Gas pressure?
    Author - Hard Knocks: My Life Inside Boiler Rooms
    PHC News Columnist
    Minnich Hydronic Consulting & Design, LLC
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,837
    Hot flame impingement on cold (relatively so) metal surfaces will also generate significant amounts of CO. Along with excess fuel, inadequate air, condensate fouling a burner and much much more.

    It's not so much a case of "You got what you paid for", as it is a matter of "You DIDN'T get what you DIDN'T pay for, and you're NOT going to get what you thought you were in the way of comfort". Borrowed from Heatboy.
  • tim smith
    tim smith Member Posts: 2,360
    Yes, the end of the blast tube being burned off could cause flame impingement and CO. The blast tube may have been too far in the combustion chamber. Usually should be flush to a little recessed from the combustion chamber. Combustion being off originally could cause the blast to overheat and corrode away. Just few notes, good luck.
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