They are characterised by single steam and water drums vertically above each other. O-type boilers first appeared as marine boilers, such as the Johnson boiler, once the switch from coal firing to oil firing began. 1 2 Milton, J. (2013) [1953]. Funk, Jason R. 'Boilers Basics' (PDF). Download IPFS Here.

There have been a vast number of designs of, particularly towards the end of the 19th century when the technology was evolving rapidly. A great many of these took the names of their originators or primary manufacturers, rather than a more descriptive name. Some large manufacturers also made boilers of several types. Accordingly, it is difficult to identify their technical aspects from merely their name. This list presents these known, notable names and a brief description of their main characteristics. See also [ ] •.

• • • • • • • • • • • • • • • • • • • • • • • • • • • A [ ] Definitions Points of Interest •: the 's standardised pattern of. • annular fire-tube boiler: a vertical with the tubes arranged radially, such as the. • annular water-tube boiler: a vertical with the tubes arranged radially, such as the with horizontal tubes, or near-vertically and conically as used by for.

• auxiliary boiler: An auxiliary boiler, on a, supplies steam that is not used for main propulsion, but is necessary for some part of the essential machinery. A small boiler may be used as an auxiliary boiler when at sea, or a donkey boiler in port. A composite auxiliary boiler does this, using waste heat from the main engines when at sea, or is separately fired when acting as a donkey boiler. Auxiliary boilers were also present in some locomotives, in particular those used in passenger rail service, where steam was used as heating for the cars being pulled. With the advent of, these steam boilers were phased out, often being replaced with concrete weights. Thornycroft steam wagon boiler, an with inclined tubes B [ ] Definitions Points of Interest • Babcock-Johnson boiler: early production operating at high pressures (850psi) and with ends to their furnace.

• • •: a development of the launch boiler, with an enlarged furnace. Also known in agricultural use as the 'colonial' or 'Britannia'. •: an early marine developed in France. •: a 'once-through'. • •: An early naval.

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• •: An early marine boiler with flat sides. Owing to the flat sides, even with extensive rod stays, the boilers were only suitable for low pressures. These boilers were physically large and contained a few large flues, each heated by its own furnace. The flues were round, rectangular or arched and usually long and labyrinthine. •: a rarely used boiler for steam locomotives that combined a conventional fire-tube boiler barrel with a water-tube firebox. There is a prominent steam drum above the boiler barrel, making it resemble a.

•: a variant of the. 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. •: a further variant of the. •; early where the tubes were grouped into bundles (of 19, for ) that shared a common header, so as to improve shared access for tube cleaning. •: a form of where the furnace was opened up into a 'whistle mouth', enlarging the grate area. Brotan-Defner boiler firebox C [ ] Definitions Points of Interest •: a form of vertical water-tube boiler, a development of the intended to encourage better water circulation.

•: a form of vertical cross-fire-tube boiler. •: the original thimble-tube boiler, using a great many short closed-ended watertubes. Often used for heat-recovery from the exhaust of large Diesel engines.

•: A vertical water-tube boiler with many long spiral coils around a central steam-and-water drum. •: a vertical boiler with horizontal fire-tubes. •: a boiler used for either direct-firing, or as a. •: a natural circulation water tube boiler in which the pre-separation of steam takes place from the water-steam mixture outside the drum and the preheated downcomers. •: a large horizontal stationary boiler with a single flue.