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Railway spark trap

Discussion in 'Random Discussion' started by john1, Oct 2, 2003.

  1. john1

    john1 Thread Starter

    Nov 25, 2000

    Could anyone tell me how the spark trap works on the
    funnel of a train steam engine ?

    Cheers, John :)
  2. Anne Troy

    Anne Troy

    Feb 14, 1999
    First Name:
    Hubby believes...

    First of all, we call it a stack, not a funnel.
    We call the spark trap, a spark arrestor.

    Basically, the spark trap screens sparks from exiting the stack/funnel, to avoid fires being started in nearby brush, etc.
  3. RSM123


    Aug 1, 2002
  4. john1

    john1 Thread Starter

    Nov 25, 2000
    Hi Dreamboat,
    Your hubby may well be right .... :)

    Hi RSM123,
    i had a look through those links, and the second one had this
    brief description of the operation of the 'spark arrestor'...

    The spark arrestor.

    This is fitted to the smokebox to prevent the emission of live
    ashes from the fire being ejected from the chimney when the
    engine is working hard. On some locomotives it is simply a mesh
    wire basket fitted between the blast nozzle and the base of the
    chimney known as the petticoat pipe, the larger particles being
    arrested and remaining in the smokebox to be removed by hand at
    the end of the day.

    A more complex type of spark arrestor has been fitted to some
    locomotives that are used on Railtrack lines due to the more
    stringent spark emission regulations. This has a vertical
    diaphragm plate at the back of the smokebox that breaks up the
    larger pieces and then deflects them towards the front of the
    smokebox were the flow of air is much less , the ashes are then
    drawn through the wire net screen before being ejected through
    the chimney, by which time they are small, dead and harmless.

    What i am looking for is a way to reduce, or even eliminate
    any sparks or glowing embers from leaving the chimney of a
    fireplace which i intend to fit into my garden shed.

    From reading the above description, two items present
    themselves to me, firstly a wire mesh screen, and secondly to
    slow the flow presumably so as particles would not be carried
    so easily.

    I propose therefore to fit some sort of choking device at the
    chimney near the start so as to slow the flow, consistent with
    still operating ok, and also to fit a removeable fine mesh
    screen somewhere up in the slower moving flow.

    Thanks for the links, any comments ?

    Cheers, John :)
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