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There is a prominent steam drum above the boiler barrel, making it resemble a Flaman boiler. [12] [13] Brotan-Deffner boiler: a variant of the Brotan boiler. The steam drum was shortened and placed behind the boiler barrel, giving a much more conventional silhouette. Around a thousand of these were used in Hungary. [12] [13]
An O-type boiler is a form of water-tube boiler. It is named, like the D-type and A-type boilers , from the approximate shape of its tubes. They are characterised by single steam and water drums vertically above each other, with curved vertical water tubes to the sides forming an overall cylindrical volume.
Butterley boiler, from Fairbairn's lecture of 1851. The Butterley or "whistle mouth" boiler is a little-known design derived from the Cornish pattern, produced by the noted Butterley boilerworks of Derbyshire. [7] It is basically a Cornish boiler with the lower half of the shell around the furnace removed, so as to permit a large fire to be lit.
Boiler steam drum. Three drum/four drum boilers – are the veterans of the normal day boilers, although they are still used in some industries. Bi drum boiler – are used for power generation and steam generation both. For power generation they are used now seldom and are replaced by single drum boilers as the bi drum boilers are non-reheat ...
Cornish boiler, with a 'Dolly Varden' dome. Most designs of stationary boilers did not generally require a steam dome, as they were built large enough to allow adequate steam space within their main drum. Water-tube designs had a suitable steam drum mounted high above their evaporating surface and this performed a similar function.
The drums are linked by straight watertubes, allowing easy tube-cleaning. This does, however, mean that the tubes enter the drums at varying angles, a more difficult joint to caulk. Outside the firebox, a pair of cold-leg pipes between each drum act as downcomers. [14] Due to its three drums, the Yarrow boiler has a greater water capacity.
A non-return valve where the feedwater enters the boiler drum. They are usually mounted halfway along the boiler drum, or else as a top feed, but away from the firebox, so as to avoid stressing it with the shock of cold water. Cladding The layer of insulation and outer wrapping around a boiler shell, particularly that of a steam locomotive.
The boiler consists of one long horizontal transverse drum, with a central locomotive-style firebox mounted in an extension beneath. The first boilers had a square firebox, [3] but this was later changed to a circular section. [4] Firing with coke is carried out through a firedoor in the side of the shell, to the rear of the boiler when ...