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A typical Cochran boiler, as illustrated, [5] might be 15 feet (4.57 m) high and 7 feet (2.13 m) in diameter, giving a heating surface of 500 square feet (46.45 m 2), and a grate area of 24 square feet (2.23 m 2). Working pressure is between 100 and 125 psi (6.9 and 8.6 bar; 690 and 860 kPa).
Detail of vertical boiler and associated steam engine in a working model steam launch Taffy a replica of Chaloner, a de Winton vertical-boilered narrow gauge railway locomotive A vertical boiler is a type of fire-tube or water-tube boiler where the boiler barrel is oriented vertically instead of the more common horizontal orientation.
These boilers were not common, owing to drawbacks with excessive wear in service. The more common form of vertical boiler, [2] which was very similar in external appearance, instead used a single flue and water-filled cross-tubes. Another form used horizontal fire-tubes, even where this added complexity, such as the Cochran boiler.
Often used for heat-recovery from the exhaust of large Diesel engines. [16] Climax boiler: A vertical water-tube boiler with many long spiral coils around a central steam-and-water drum. [17] Cochran boiler: a vertical boiler with horizontal fire-tubes. [18] composite boiler: a boiler used for either direct-firing, or as a heat-recovery boiler ...
In the locomotive boiler, the saturated steam is very often passed into a superheater, back through the larger flues at the top of the boiler, to dry the steam and heat it to superheated steam. The superheated steam is directed to the steam engine's cylinders or very rarely to a turbine to produce mechanical work.
A shell or flued boiler is an early and relatively simple form of boiler used to make steam, usually for the purpose of driving a steam engine. The design marked a transitional stage in boiler development, between the early haystack boilers and the later multi-tube fire-tube boilers .
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The boiler has similarities with both the locomotive boiler (the multiple small fire-tubes), and the Scotch marine boiler (the short cylindrical furnace). As a fire-tube boiler it has generous heating area and so is an effective steamer. Firebox construction is also simpler, thus cheaper, than for the locomotive firebox.