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Thread: boilers

  1. #1
    Join Date
    Dec 2009

    Angry boilers

    what is refractory used for in a watertube boilers and what happens when the flame touches bare metal why is that a problem and how does that work.

  2. #2
    Join Date
    Jun 2011
    Glenrothes, Scotland
    Refractorys are used to protect metal surfaces at critical points of a boiler (the door being the main one.) If you have a flame hitting bare metal you have a situation called 'flame impingement' This has 2 main dangers. The metal which is being directly heated can fail through thermal stresses like excessive expansion and contraction. Also flame impingement causes crazy sooting up of the appliance and therefor creates masses of CO (carbon monoxide).

  3. #3
    Join Date
    Dec 2009
    thank you for your reply makes sense

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