List of boiler types, by manufacturer

List of boiler types, by manufacturer

There have been a vast number of designs of steam boiler, 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

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Definitions Points of Interest
  • auxiliary boiler: An auxiliary boiler, on a steam ship, supplies steam that is not used for main propulsion, but is necessary for some part of the essential machinery.[3]
    See also donkey boiler.
    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.
Thornycroft steam wagon boiler, an annular water-tube with inclined tubes
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Definitions Points of Interest
  • Babcock-Johnson boiler: early production Johnson boilers operating at high pressures (850psi) and with water-wall ends to their furnace.[4]
  • Babcock & Wilcox boiler
  • Babcock & Wilcox marine boiler
  • Benson boiler: a monotube "once-through" steam generator.[6]
  • Bolsover Express boiler [7]
  • box boiler: 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.[8]
  • Brotan boiler: 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 Flaman boiler.[9][10]
    • Brotan-Defner 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.[9][10]
    • Brotan-Fialovits boiler: a further variant of the Brotan-Defner boiler.[9]
Babcock & Wilcox
Brotan-Defner boiler firebox
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Definitions Points of Interest
  • Clarke Chapman "Tyne" boiler: a form of vertical water-tube boiler, a development of the cross-tube boiler intended to encourage better water circulation.
  • Clarkson thimble-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.[12]
  • Climax boiler: A vertical water-tube boiler with many long spiral coils around a central steam-and-water drum.[13]
  • Cochran boiler: a vertical boiler with horizontal fire-tubes.[14]
  • Cornish boiler: a large horizontal stationary boiler with a single flue.
  • cross-tube boiler: usually a vertical flued boiler with a small number of large water-carrying cross-tubes within the firebox.
The term is also applied to vertical boilers with other arrangements of tubes, such as those with horizontal fire-tubes.
  • Crosti boiler:
section through a Cornish boiler
Vertical flue cross-tube boiler
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Definitions Points of Interest
  • De Poray boiler: patented French designs with a secondary combustion chamber to improve combustion efficiency. A vertical form of this uses field-tubes.
  • Doble steam-car boiler:
  • donkey boiler: A donkey boiler is used to supply non-essential steam to a ship for 'hotel' services such as heating or lighting when the main boilers are not in steam, for example, when in port.[3] Donkey boilers were also used by the last sailing ships for working winches and anchor capstans.
    See also auxiliary boiler.
  • Dublin "economic" boiler: a vertical multitubular return fire-tube design, for model engineering-scale uses.[12]
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Definitions Points of Interest
  • egg-ended boiler: an early form of tubular wagon boiler, with hemispherical ends to support higher pressures.
  • Elephant boiler: an early multi-cylindered wagon boiler, popular in France.
  • express boiler: another term for small-tube water-tube boilers, on account of their high ratio between heating surface area and water volume, and thus their rapid steam-raising.
Egg-ended boiler
with (wagon boiler behind)
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Definitions Points of Interest
  • Fairfield-Johnson boiler: a later form of Johnson boiler operating at lower pressure (450psi rather than 850psi), but still a high superheat temperature 825 °F (441 °C).[4]
  • Fairlie boiler: A double-ended locomotive boiler with a central firebox, used in Fairlie's patent for double-ended articulated steam locomotives.
  • fire-tube boiler: A boiler with many narrow fire-tubes inside a water drum. A development of the flued boiler, where the many smaller tubes give a much larger heating surface area for the overall boiler volume.
  • Flaman boiler: an attempt to squeeze the largest possible locomotive boiler into the loading gauge by splitting the boiler into two drums: a fire-tube boiler beneath and a steam drum above.[18]
  • flued boiler: A boiler with only one or two large diameter fire-tubes inside a water drum. These later developed into the fire-tube boiler.
  • forced-circulation boiler: boilers where circulation is forced by a pump, rather than relying on thermosyphon effect. These may use either forced-water-circulation (e.g. La Mont) or forced-steam-circulation (e.g. Löffler).[19]
  • Foster-Wheeler boiler
    • D type
    • controlled-superheat type
    • ESD type (External Superheat, D type)
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Definitions Points of Interest
  • Galloway boiler: a Lancashire boiler fitted with Galloway tubes. Originally these fused the Lancashire boiler's original two flues into a single kidney-shaped flue, with the tubes mounted in the joined section. Later boilers kept the cylindrical flues separate and placed the tubes within them.
  • gothic boiler: an early locomotive boiler, where the outer firebox was particularly large and served as the steam dome, often highly decorated with polished brass. These were popular for early railway locomotives, from 1830 to 1850.[20]
This is another form of boiler frequently described as a "haystack".
  • gunboat boiler: similar to the commonly known locomotive boiler, from steam locomotives.
    A horizontal boiler drum contains multiple fire-tubes and a separate furnace. However the furnace in a gunboat boiler has no opening at the bottom of the furnace to allow dumping of ash, the furnace is completely water cooled, similar to a scotch boiler furnace. These boilers were used in early torpedo boats and gunboats, having low height for protection from enemy gunfire.
Galloway boiler
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Definitions Points of Interest
  • haystack boiler: Early balloon- or haystack-shaped, circular in plan with a domed top and often a flat base.
See also Napier and gothic, quite different designs also described as "haystack" boilers.
  • heat-recovery boiler: a boiler without its own furnace, used to recover heat from some earlier process, such as a large marine Diesel engine or an industrial furnace.[15]
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Definitions Points of Interest
  • Illingworth boiler: a water-tube boiler.[23]
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Definitions Points of Interest
  • Johnson boiler: one of the first "modern" classes of high-pressure marine oil-fired water-tube boilers. They have a single steam drum above a single water drum. Their small-diameter water-tubes curve outwards on each side to form a cylindrical furnace. As there is no grate or ashpan beneath, firing must be by oil. Return circulation is by external downcomers. Early versions also used water-walls at each end of the furnace, later ones had plain firebrick walls.[4]
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Definitions Points of Interest
  • Kier: (sometimes Keeve or Kieve) an un-fired boiler, a pressure vessel heated by an external steam supply, used for bleaching in dyeworks and processing paper pulp. In use they were continuously rotated by an engine, steam being supplied through a rotating joint in the axle. They were usually spherical, sometimes cylindrical, and some were recycled from old boiler shells.[26]
  • Kingdom boiler: an uncommon pattern of water-tube boiler.[27]
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Definitions Points of Interest
  • La Mont boiler: a forced-water-circulation boiler.[28] They are often used as marine heat-recovery boilers.[28] It was also used, unsuccessfully, for an experimental steam locomotive in East Germany in the 1950s.[29]
  • Lancashire boiler: a development of the Cornish boiler, with two flues.
  • large-tube water-tube boiler: early water-tube boilers with large diameter water-tubes, of 3 inches and above, rather than the later small-tube designs.
Sometimes small return-tube boilers of just this form are also described as "launch-type".
  • Lentz boiler A large launch-type boiler with a corrugated furnace, used rarely for some steam locomotives. Of German design.[31] A similar boiler, the Vanderbilt, was used in the USA.
  • Locomobile steam-car boiler
  • locomotive boiler: the commonly known form familiar from steam locomotives.
    A horizontal boiler drum contains multiple fire-tubes and a separate firebox.
  • Lune Valley boiler [33]
Lancashire boiler
Locomotive boiler
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Definitions Points of Interest
  • monotube steam generator: A single tube, usually in a multi-layer spiral, that forms a once-through steam generator. The first of these was the Herreshoff steam generator of 1873.[34]
  • multi-tube boiler: fire-tube boiler with multiple small fire-tubes, rather than a single large flue.
monotube boiler (White steam car)
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  • Napier boiler: A high-domed low-pressure boiler used on early steamships.[36]
Also known as the "haystack", although not the usual, and even earlier, haystack boiler.[36]
  • Normand-Sigaudy boiler: a siamesed Normand boiler, for larger ships.[39]
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Definitions Points of Interest
  • Paxman "economic" boiler: a form of Scotch boiler, adapted for stationary use and set in a brick surround as an external flue.
  • pistol boiler: a form of small locomotive boiler with a circular firebox, to avoid the need for staying.
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Definitions Points of Interest
  • return-flue boiler: flued boiler with a single large flue that folds back on itself. Used in early steam locomotives.
  • return-tube boiler: fire-tube boiler with multiple small fire-tubes that reverse the direction of gas flow within the boiler. Individual tubes are not folded: there is usually a furnace, a combustion chamber that reverses the flow, then the tubes return from that. The Scotch is a well-known example of this type.
  • round-topped boilers are an early form of locomotive boiler, where the outer wrapper of the firebox is a semi-circular continuation of the cylindrical boiler barrel.
Robertson boiler
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Definitions Points of Interest
  • Schmidt boiler: a high-pressure locomotive boiler, as used for the experimental LMS 6399 Fury. To avoid the usual problems of scale formation in a highly-stressed firebox, the Schmidt system uses a separate primary circuit filled with distilled water.[42]
  • Sentinel-Cammel boiler
  • Sentinel-Doble boiler
  • Shand & Mason:[44]
  • shell boiler:
  • small-tube water-tube boiler: water-tube boilers with small-diameter tubes, 2 inch or less, rather than the older large-tube designs, with tubes of 3 inch and above. Also termed Express or Speedy boilers.
  • Smithies boiler: A development of the pot boiler with added watertubes, used for model steam locomotives.[45] The boiler was invented by F. Smithies in 1900 and developed by Greenly. It consists of a cylindrical water drum hidden inside a larger drum that forms the visible part of the model. Long slightly-sloping water-tubes are mounted beneath this water drum. The advantage of the boiler over similar model boilers is the use of almost the entire water drum surface for heating, although this also tends to scorch any paintwork on the outer drum, unless this is insulated.[46] In a later development by Greenly, the backhead of the boiler becomes a double-walled water space and straight water-tubes are led into this at an angle.
  • spherical boiler:[48]
  • Steam generator: modern boilers, with very small volume in relation to their heating area. Boiling is thus almost instantaneous and the volume of heated, but unboiled, water is minimal.[49]
  • Straker boiler: a vertical water-tube boiler for the Straker steam wagon.
  • Sulzer boiler: a monotube "once-through" steam generator.[50]
Scotch marine boiler
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Definitions Points of Interest
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Definitions Points of Interest

  • vertical boiler: flued or fire-tube designs where the main shell is a cylinder on a vertical axis, rather than horizontal. Boilers of this external form may have a great variety of internal arrangements.
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Definitions Points of Interest
  • wagon boiler: an early boiler, enlarged from the haystack to a flat-sided rectangular plan that permitted a larger grate area, but could only withstand low pressures.
  • White-Forster boiler
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Definitions Points of Interest
  • Yorkshire steam wagon boiler: A double-ended transverse-mounted boiler used in steam wagons, to avoid problems of tilting when climbing hills. Internally it resembled a locomotive or Fairlie boiler with a central firebox and multiple fire-tubes to each end. In the Yorkshire though, a second bank of fire-tubes above returned to a central smokebox and a single chimney.
Yarrow boiler
Yorkshire steam wagon
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  1. ^ Harris, Model Boilers, pp. 56-57
  2. ^ a b Harris, Model Boilers, p. 55
  3. ^ a b Milton, J. H. (1961) [1953]. Marine Steam Boilers (2nd ed.). Newnes. p. 60. 
  4. ^ a b c Milton, Marine Steam Boilers, pp. 111-115
  5. ^ a b c d e f g h i Brassey, Thomas Allnutt (1896). The Naval Annual. Brassey. pp. 118–119. ISBN 1-4212-4178-1. 
  6. ^ Milton, Marine Steam Boilers, pp. 144-145
  7. ^ Harris, K. N. (1974). Model Boilers and Boilermaking. MAP. pp. 58–59. ISBN 0852423772. 
  8. ^ Rippon, Commander P.M., RN (1998). The evolution of engineering in the Royal Navy. Vol 1: 1827-1939. Spellmount. p. 29. ISBN 0-946771-55-3. 
  9. ^ a b c "Brotan". Loco Locomotive gallery. 
  10. ^ a b "Brotan". 
  11. ^ Kennedy, Modern Engines, Vol VI
  12. ^ a b Harris, Model Boilers, pp. 58-60
  13. ^ Kennedy, Modern Engines, Vol V
  14. ^ Milton, J. H. (1961) [1953]. Marine Steam Boilers (2nd ed.). Newnes. pp. 63–66. 
  15. ^ a b Milton, Marine Steam Boilers, pp. 119-137
  16. ^ Gardner D. Hiscox (2001) [1904]. 970 Mechanical Appliances and Novelties of Construction. Algrove Publishing. pp. 58. ISBN 1-894572-37-8. 
  17. ^ Harris, Model Boilers, pp. 52-53
  18. ^ "Flaman". Loco Locomotive gallery. 
  19. ^ Milton, Marine Steam Boilers, pp. 138-145
  20. ^ Hewison, Boiler Explosions, p. 12
  21. ^ Harris, Model Boilers, pp. 158-160
  22. ^ Kennedy, Modern Engines, Vol VI
  23. ^ Harris, Model Boilers, pp. 58-59
  24. ^ Milton, Marine Steam Boilers, p. 59
  25. ^ Harris, Model Boilers, pp. 47
  26. ^ McEwen, Alan (2009). Historic Steam Boiler Explosions. Sledgehammer Engineering Press. ISBN 978-0-9532725-2-5. 
  27. ^ Harris, Model Boilers, pp. 60-61
  28. ^ a b Milton, Marine Steam Boilers, pp. 138-141
  29. ^ a b "German high-pressure locomotives". Loco Locomotive gallery. 
  30. ^ Harris, Model Boilers, pp. 1501-151
  31. ^ a b Ahrons, E.L. (1966). The British Steam Railway Locomotive. I, to 1925. Ian Allan. p. 351. 
  32. ^ Milton, Marine Steam Boilers, pp. 138-141
  33. ^ Harris, Model Boilers, pp. 56-58
  34. ^ Light Steam Power XXIV (3): 157–159. July-September 1975. 
  35. ^ Kennedy, Rankin (1912). The Book of Modern Engines and Power Generators. V. London: Caxton. pp. 43–45. 
  36. ^ a b Harris, Model Boilers, pp. 54
  37. ^ Harris, Model Boilers, pp. 63,65
  38. ^ Cisin, Harry G. (1921). Modern Marine Engineering. New York: Van Nostrand. pp. 84. 
  39. ^ Robertson, Leslie S.. Water-tube boilers. pp. 38. 
  40. ^ Harris, Model Boilers, pp. 63-64
  41. ^ McEwen, Historic Steam Boiler Explosions
  42. ^ "Schmidt high-pressure system". Loco Locomotive gallery. 
  43. ^ Harris, Model Boilers, pp. 167-168
  44. ^ Harris, Model Boilers, pp. 57
  45. ^ Harris, Model Boilers, pp. 169-171
  46. ^ Greenly, Henry (1922). Model Steam Locomotives. Cassell. pp. 52–56. 
  47. ^ Milton, Marine Steam Boilers, pp. 130-132
  48. ^ Hills, Power from Steam, pp. 130-131
  49. ^ a b CITEREFNaval_Marine_Engineering_Practice1971
  50. ^ Milton, Marine Steam Boilers, pp. 143-144
  51. ^ a b Stokers Manual ((1912 edition) ed.). Admiralty, via HMSO, via Eyre & Spottiswoode. 1901. 
  52. ^ "Thuile". Loco Locomotive gallery. 
  53. ^ "Velox locomotive". Loco Locomotive gallery. 
  54. ^
  55. ^
  56. ^ Britannica, 1911
  57. ^ Hills, Power from Steam
  58. ^ Harris, Model Boilers, pp. 36
  59. ^ Kennedy, Rankin (1912). The Book of Modern Engines and Power Generators. VI. London: Caxton. 
  60. ^ Milton, Marine Steam Boilers, pp. 108-111
  61. ^ Borthwick, Alastair (1965). Yarrows: the first hundred years.. Yarrows. 

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