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  2. Centralia mine fire - Wikipedia

    en.wikipedia.org/wiki/Centralia_mine_fire

    At one point, work was at a standstill for five days during the Labor Day weekend in early September. [why?] [citation needed] Finally, the fire was traveling in a northward direction, which caused the fire to move deeper into the coal seam. This, combined with the work restrictions and inadequate equipment, greatly increased the excavation cost.

  3. Flame lift-off - Wikipedia

    en.wikipedia.org/wiki/Flame_lift-off

    Flame lift-off in oil fired pressure jet burners is an unwanted condition in which the flame and burner become separated. This condition is most commonly created by excessive combustion air and often results in the loss of flame as the photoelectric cell fails to register the light of the flame, this in turn results in a safety lockout of the control box.

  4. Merrimack Valley gas explosions - Wikipedia

    en.wikipedia.org/wiki/Merrimack_Valley_gas...

    An explosion at one of the homes involved caused the house to shift off of its foundation. This in turn caused the chimney attached to fall on a car occupied by a fleeing resident, killing him. In addition to this death, twenty-five others were reported injured overall from the whole event. [14] [15] [4] All of the fires were put out by 6:45 pm ...

  5. Eternal flame - Wikipedia

    en.wikipedia.org/wiki/Eternal_flame

    Nizhny Novgorod Kremlin eternal flame memorializing losses during World War II .. An eternal flame is a flame, lamp or torch that burns for an indefinite time. Most eternal flames are ignited and tended intentionally, but some are natural phenomena caused by natural gas leaks, peat fires and coal seam fires, all of which can be initially ignited by lightning, piezoelectricity or human activity ...

  6. Pilot light - Wikipedia

    en.wikipedia.org/wiki/Pilot_light

    In natural gas furnaces, water heaters, and room heating systems, a safety cut-off switch is normally included so that the gas supply to the pilot and heating system is shut off by an electrically operated valve if the pilot light goes out. This cut-off switch usually detects the pilot light in one of several ways: A flame rectification device. [2]

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