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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.
Soon after the power of the steam blast was discovered it became apparent that a smokebox was needed beneath the chimney, to provide a space in which the exhaust gases emerging from the boiler tubes can mix with the steam. This had the added advantage of allowing access to collect the ash drawn through the fire tubes by the draught.
In response to an 1857 patent infringement claim, Baldwin Locomotive Works compiled a diagram illustrating 57 different spark arresting chimney designs. [4] The most popular design was a bonnet chimney. The bonnet was a funnel-shaped sheet metal cone fitted over a conventional cylindrical chimney. The lower, small-diameter portion of the cone ...
Class A are either an insulated, double wall stainless steel pipe or triple wall, air-insulated pipe often known by its genericized trade name Metalbestos. 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 ...
The Blast Pipe (a) directs exhaust steam into the smokebox (b). The steam entrains the smoke from the firebox (c), creating more draft which helps speed the smoke out the chimney (d). The primacy of discovery of the effect of directing the exhaust steam up the chimney as a means of providing draft through the fire is the matter of some ...
The Kylchap exhaust system Double Kylchap exhaust of the Spanish RENFE 141 F 2416 (smokebox cut open), in the Delicias Museum, Madrid. The Kylchap steam locomotive exhaust system was designed and patented by French steam engineer André Chapelon, using a second-stage nozzle designed by the Finnish engineer Kyösti Kylälä, known as the Kylälä spreader, with the composite name KylChap being ...