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  2. Double-walled pipe - Wikipedia

    en.wikipedia.org/wiki/Double-walled_pipe

    Double wall pipes are usually hydrostatically tested, or tested to hold and maintain a target gas pressure before the first use. A different special application of a double-walled pipe is a jacketed pipe, which is used to make high viscosity liquids flow at elevated temperature through the carrier pipe. The outer pipe circulates hot fluids that ...

  3. Chimney - Wikipedia

    en.wikipedia.org/wiki/Chimney

    Class B are uninsulated double wall pipes often called B-vent, and are only used to vent non-condensing gas appliances. These may have an aluminum inside layer and galvanized steel outside layer. Concrete flue liners are like clay liners but are made of a refractory cement and are more durable than the clay liners.

  4. Flue pipe - Wikipedia

    en.wikipedia.org/wiki/Flue_pipe

    A flue pipe (also referred to as a labial pipe) is an organ pipe that produces sound through the vibration of air molecules, in the same manner as a recorder or a whistle, in a pipe organ. Air under pressure (called wind ) is driven through a flue and against a sharp lip called a labium , causing the column of air in the pipe to resonate at a ...

  5. Flue - Wikipedia

    en.wikipedia.org/wiki/Flue

    A seven-flue chimney in a four-storey Georgian house in London, showing alternative methods of sweeping. A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself. [1]

  6. Double chimney - Wikipedia

    en.wikipedia.org/wiki/Double_chimney

    A double chimney (or double stack, double smokestack in American English) is a form of chimney for a steam locomotive, where the conventional single opening is duplicated, together with the blastpipe beneath it. Although the internal openings form two circles, the outside appearance usually forms a single elongated oval.

  7. Steam locomotive exhaust system - Wikipedia

    en.wikipedia.org/wiki/Steam_locomotive_exhaust...

    Ell was able to double the maximum steaming rate of the GWR Manor class by apparently minor alterations to the front end design, and more than doubled the rate for an LNER V2. Andre Chapelon made a significant improvement with his Kylchap exhaust which incorporated a Kylälä spreader (second stage nozzle) and third stage cowl between the ...

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