List of boiler types by manufacturer

{{Short description|None}} 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 == * Glossary of boiler terminology

== A == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Admiralty three-drum boiler'''{{anchor|Admiralty boiler}}: the Royal Navy's standardised pattern of three-drum boiler. * '''annular fire-tube boiler''': a vertical fire-tube boiler with the tubes arranged radially,{{sfn|Harris, Model Boilers|pages=56–57}} such as the Robertson. * '''annular water-tube boiler''':{{anchor|annular water-tube boiler}} a vertical water-tube boiler with the tubes arranged radially, such as the Straker with horizontal tubes, or near-vertically and conically{{sfn|Harris, Model Boilers|page=55}} as used by Thornycroft for steam wagons. * '''{{Visible anchor|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.{{sfn|Milton, Marine Steam Boilers|page=60}} 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. 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 head end power, these steam boilers were phased out, often being replaced with concrete weights.

| [[File:Thornycroft vertical water-tube boiler, section (Rankin Kennedy, Modern Engines, Vol III).jpg|center|thumb|upright=0.8|Thornycroft steam wagon boiler, an annular water-tube with inclined tubes]] |}

== B == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Babcock-Johnson boiler''': early production Johnson boilers operating at high pressures ({{cvt|850|psi|bar kPa|disp=sqbr}}) and with water-wall ends to their furnace.{{sfn|Milton, Marine Steam Boilers|pages=111-115}} * '''Babcock & Wilcox boiler'''{{anchor|Babcock & Wilcox boiler}} * '''Babcock & Wilcox marine boiler''' * '''Bagnall boiler''': a development of the launch boiler, with an enlarged furnace. Also known in agricultural use as the 'colonial' or 'Britannia'. * '''Belleville boiler'''{{anchor|Belleville boiler}}: an early marine water-tube boiler developed in France by Julien Belleville.<ref>{{cite journal|author=Uri Zelbstein |title=L'histoire d'une invention: Julien Belleville et sa chaudière à tubes d'eau |date=1987 |journal=History and Technology |volume=3 |issue=2 |pages=205–218 |language=fr |doi=10.1080/07341518708581667 }}</ref> <ref name="Naval Annual (1896), RN boiler trials" >{{cite book |title=The Naval Annual |chapter=Marine Engineering and Water-tube Boilers |author-last=Dunell |author-first=G. R. |editor-last=Brassey |editor-first=Thomas Allnutt |editor-link=Thomas Brassey, 1st Earl Brassey |url=https://archive.org/details/CASGA_120403 |publisher=J. Griffin & Co |location=Portsmouth |year=1896 |pages=118–119 }}</ref><ref>{{Cite book |title=Warrior to Dreadnought |last=Brown |first=David K |orig-year=1997 |year=2010 |publisher=Chatham |isbn=978-1-84832-086-4 |ref={{harvid|Brown|1997}} |page=137 }}</ref> * '''Benson boiler''': a monotube "once-through" steam generator.{{sfn|Milton, Marine Steam Boilers|pages=144-145}} * '''Blake boiler''' * '''Blechynden boiler'''{{anchor|Blechynden boiler}}: An early naval water-tube boiler.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}} * '''Bolsover Express boiler'''<ref name="Harris, Model Boilers, Bolsover Express" >{{cite book |title=Model Boilers and Boilermaking |last=Harris |first=K. N. |isbn=0-85242-377-2 |publisher=MAP |year=1974 |pages=58–59 |ref={{harvid|Harris, Model Boilers}} }}</ref> * '''box boiler'''{{anchor|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.<ref>{{Cite book |title=The evolution of engineering in the Royal Navy, Vol 1: 1827-1939 |last=Rippon |first=Commander P.M. |year=1998 |publisher=Spellmount |isbn=0-946771-55-3 |page=29 }}</ref> * '''Brotan boiler'''{{anchor|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.<ref name="Loco loco, Brotan" >{{cite web |title=Brotan |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/brotan/brotan.htm |author=Douglas Self |author-link=Douglas Self |publisher= Loco Locomotive gallery }}</ref><ref name="Erojr, Brotan" >{{cite web |title=Brotan |url=http://erojr.home.cern.ch/erojr/Content/phylo/BROTAN.HTM }}</ref> ** '''Brotan-Deffner boiler'''{{anchor|Brotan-Deffner boiler}}{{anchor|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.<ref name="Loco loco, Brotan" /><ref name="Erojr, Brotan" /> ** '''Brotan-Fialovits boiler''': a further variant of the Brotan-Deffner boiler.<ref name="Loco loco, Brotan" /> * '''bundled-tube water-tube boiler'''{{anchor|bundled-tube water-tube boiler}}; early large-tube water-tube boilers where the tubes were grouped into bundles (of 19, for geometrical reasons) that shared a common header, so as to improve shared access for tube cleaning.{{sfn|Kennedy, Modern Engines, Vol VI|page= }}{{page needed|date=December 2020}} * '''Butterley boiler''': a form of Cornish boiler where the furnace was opened up into a "whistle mouth", enlarging the grate area. |  center|thumb|upright=0.8|'''Babcock & Wilcox''' center|thumb|upright=0.8|'''Brotan-Defner''' boiler firebox |}

== C == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Clarke Chapman "Tyne" boiler''': a form of vertical water-tube boiler, a development of the cross-tube boiler intended to encourage better water circulation. * '''Clarke Chapman "Victoria" boiler''': a form of vertical cross-fire-tube boiler. * '''Clarkson thimble tube boiler'''<ref>{{cite web |url=http://www.gracesguide.co.uk/Clarkson_Thimble_Tube_Boiler_Co |title=Clarkson Thimble Tube Boiler Co |website=Grace's Guide |access-date=10 April 2018 }}</ref>{{anchor|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.{{sfn|Harris, Model Boilers|pages=58-60}} * '''Climax boiler''': A vertical water-tube boiler with many long spiral coils around a central steam-and-water drum.{{sfn|Kennedy, Modern Engines, Vol V|page= }}{{page needed|date=December 2020}} * '''Cochran boiler''': a vertical boiler with horizontal fire-tubes.{{sfn|Milton, Marine Steam Boilers|pages=63–66}} * '''composite boiler'''{{anchor|composite boiler}}: a boiler used for either direct-firing, or as a heat-recovery boiler.{{sfn|Milton, Marine Steam Boilers|pages=119–137}} * '''Corner tube boiler'''{{anchor|Cornertube boiler}}: 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. * '''Cornish boiler'''{{anchor|Cornish boiler}}: a large horizontal stationary boiler with a single flue. * '''cross-tube boiler'''{{anchor|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'''{{anchor|Crosti boiler}}: |  [[File:Cornish boiler, end-section (Heat Engines, 1913).jpg|center|thumb|upright=0.8|section through a '''Cornish''' boiler]]

[[File:Single flue vertical boiler (Heat Engines, 1913).jpg|center|thumb|upright=0.8|Vertical flue '''cross-tube''' boiler]] |}

== D == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''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'''{{anchor|Doble|}}: * '''{{Visible anchor|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.{{sfn|Milton, Marine Steam Boilers|page=60}} Donkey boilers were also used by the last sailing ships for working winches and anchor capstans. See also auxiliary boiler. * '''du Temple boiler'''{{anchor|Du Temple boiler}}: An early naval water-tube boiler, patented in 1876.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}}<ref name="970 Mechanical Appliances, Du Temple" >{{cite book |title=970 Mechanical Appliances and Novelties of Construction |author=Gardner D. Hiscox |orig-year=1904 |publisher=Algrove Publishing |year=2001 |isbn=1-894572-37-8 |pages=58 |ref=970 Mechanical Appliances }}</ref> * '''Dublin "economic" boiler''': a vertical multitubular return fire-tube design, for model engineering-scale uses.{{sfn|Harris, Model Boilers|pages=160–161}} * '''Dürr boiler''' An early naval water-tube boiler, developed and mostly used in Germany, but also trialled in the British {{HMS|Medusa|1888}}{{sfnp|Brown|1997|page=165}}

== E == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''egg-ended boiler''':{{anchor|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''':{{anchor|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. | [[File:Egg-ended and wagon boilers at Armley Mills by Chris Allen.jpg|center|thumb|upright=0.8|Egg-ended boiler with (wagon boiler behind)]] |}

== F == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Fairbairn's five-tube boiler''' * '''Fairbairn-Beeley boiler''', a fire-tube boiler with multiple joined shells of small diameter * '''Fairfield-Johnson boiler''': a later form of Johnson boiler operating at lower pressure ({{cvt|450|psi|bar kPa|disp=sqbr}} rather than {{cvt|850|psi|bar kPa|disp=sqbr}}), but still a high superheat temperature {{convert|825|°F|°C}}.{{sfn|Milton, Marine Steam Boilers|pages=111-115}} * '''Fairlie boiler'''{{anchor|Fairlie boiler}}: A double-ended locomotive boiler with a central firebox, used in Fairlie's patent for double-ended articulated steam locomotives. * '''field-tube boiler'''{{anchor|field-tube boiler}}:{{sfn|Harris, Model Boilers|pages=52–53}} * '''fire-tube boiler'''{{anchor|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'''{{anchor|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.<ref name="Loco loco, Flaman" >{{cite web |title=Flaman |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/flaman/flaman.htm |publisher= Loco Locomotive gallery }}</ref> * '''flued boiler'''{{anchor|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'''{{anchor|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).{{sfn|Milton, Marine Steam Boilers|pages=138-145}} * '''Foster-Wheeler boiler''' {{anchor|Foster-Wheeler boiler}} ** '''D type''' ** '''controlled-superheat type''' ** '''ESD type''' (External Superheat, D type) * '''Franco-Crosti boiler'''{{anchor|Franco-Crosti boiler}}: | [[File:Chaudiere flaman.jpg|center|thumb|upright=0.8|Flaman boiler]] |}

== G == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''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'''{{anchor|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.<ref name="Hewison, Locomotive Boiler Explosions, Gothic" >{{cite book |first=Christian H. |last=Hewison |title=Locomotive Boiler Explosions |year=1983 |publisher=David and Charles |isbn=0-7153-8305-1 |page=12}}</ref> : This is another form of boiler frequently described as a "haystack". * '''gunboat boiler'''{{anchor|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. |  center|thumb|upright=0.8|'''Galloway boiler''' |}

== H == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|  * '''Harris "Economic" boiler'''{{sfn|Harris, Model Boilers|pages=158–160}} * '''haystack boiler'''{{anchor|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'''{{anchor|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.{{sfn|Milton, Marine Steam Boilers|pages=119–137}} * '''Hornsby boiler''': a form of bundled-tube water-tube boiler.{{sfn|Kennedy, Modern Engines, Vol VI|page= }}{{page needed|date=December 2020}} * '''Huber boiler''':{{anchor|Huber boiler}} a return-tube boiler used in the Huber company's traction engines. |  [[File:Haystack boiler.jpg|center|thumb|upright=0.8|'''haystack boiler''']] |}

== I == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Illingworth boiler''': a water-tube boiler.{{sfn|Harris, Model Boilers|pages=58–59}} * '''Inglis''': a modified form of the Scotch boiler, with an additional combustion chamber.{{sfn|Milton, Marine Steam Boilers|page=59}}{{sfn|Harris, Model Boilers|page=47}} |}

== J == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Johnson boiler'''{{anchor|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.{{sfn|Milton, Marine Steam Boilers|pages=111-115}} |}

== K == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|  * '''Kier''':{{anchor|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.<ref name="McEwen, Historic Steam Boiler Explosions, Kier" >{{cite book | first=Alan | last=McEwen | year=2009 | title=Historic Steam Boiler Explosions | publisher=Sledgehammer Engineering Press | isbn=978-0-9532725-2-5 |ref={{harvid|McEwen, Historic Steam Boiler Explosions}} }}</ref>

* '''Kingdom boiler''': an uncommon pattern of water-tube boiler.{{sfn|Harris, Model Boilers|pages=60–61}} * '''Kewanee Boiler Corporation''': Maker of fire tube boilers |- |}

== L == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''La Mont boiler'''{{anchor|La Mont boiler}}: a forced-water-circulation boiler.{{sfn|Milton, Marine Steam Boilers|pages=138-141}} They are often used as marine heat-recovery boilers.{{sfn|Milton, Marine Steam Boilers|pages=138-141}} It was also used, unsuccessfully, for an experimental steam locomotive in East Germany in the 1950s.<ref name="Loco loco, Hochdruck" /> * '''Lancashire boiler'''{{anchor|Lancashire boiler}}: a development of the Cornish boiler, with two flues. * '''large-tube water-tube boiler'''{{anchor|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. * '''Larsen & Toubro MHI Boilers'''{{anchor|Larsen & Toubro MHI Boilers}}: Super Critical Boilers. * '''launch-type boiler'''{{anchor|launch-type boiler}}: a small fire-tube boiler used in launches and smaller steam yachts. A horizontal cylinder in form, with a cylindrical furnace and multiple fire-tubes. They have some resemblance to a small Scotch boiler or Huber boiler, but with the fire-tubes extending beyond the furnace end, rather than folded back as a return-tube boiler.{{sfn|Harris, Model Boilers|pages=150-151}} : Sometimes small return-tube boilers of just this form are also described as "launch-type". * '''Lentz boiler'''{{anchor|Lentz boiler}} A large launch-type boiler with a corrugated furnace, used rarely for some steam locomotives. Of German design.<ref name="Ahrons, Lentz" >{{cite book |title=The British Steam Railway Locomotive, Vol. I, to 1925 |last=Ahrons |first=E.L. |author-link=E.L. Ahrons |publisher=Ian Allan |year=1966 |page=351 }}</ref> A similar boiler, the Vanderbilt, was used in the USA. * '''Locomobile steam-car boiler''' * '''locomotive boiler'''{{anchor|locomotive boiler}}: the commonly known form familiar from steam locomotives. A horizontal boiler drum contains multiple fire-tubes and a separate firebox. * '''Löffler boiler'''{{anchor|Löffler boiler}}: a forced-steam-circulation boiler. It was used unsuccessfully on a German steam locomotive of the 1930s.<ref name="Loco loco, Hochdruck" >{{cite web |title=German high-pressure locomotives |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/germHP/germhigh.htm#02 |publisher= Loco Locomotive gallery }}</ref>{{sfn|Milton, Marine Steam Boilers|pages=138-141}} * '''Lune Valley boiler'''{{sfn|Harris, Model Boilers|page=56–58}} |  center|thumb|upright=0.8|'''Lancashire boiler''' center|thumb|upright=0.8|'''Locomotive boiler''' |}

== M == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* Monotube steam generator{{anchor|monotube boiler}}{{anchor|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.<ref>{{cite journal |journal=Light Steam Power |title=Monotube steam generator |date=July–September 1975 |volume=XXIV |issue=3 |pages=157–159 }}</ref> * '''Multi-tube boiler'''{{anchor|multi-tube boiler}}: fire-tube boiler with multiple small fire-tubes, rather than a single large flue. * '''Mumford boiler'''{{anchor|Mumford boiler}}: A form of three-drum water-tube boiler by A. G. Mumford of Colchester.<ref>{{cite web |url=http://www.gracesguide.co.uk/A._G._Mumford |website=Grace's Guide |title=A. G. Mumford |access-date=20 March 2016 }}</ref> The water-tubes are highly curved and the flue only covers the centre of the steam drum, not enclosing its whole length.<ref>{{cite book |title=The Book of Modern Engines and Power Generators |year=1912 |last=Kennedy |first=Rankin |publisher=Caxton |location=London |volume=V |ref={{harvid|Kennedy, Modern Engines, Vol V}} |pages=43–45 }}</ref> |  center|thumb|upright=0.8|monotube boiler (White steam car) center|thumb|upright=0.8|Mumford |}

== N == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Napier boiler'''{{anchor|Napier boiler}}: A high-domed low-pressure boiler used on early steamships.{{sfn|Harris, Model Boilers|page=54}} : Also known as the "haystack", although not the usual, and even earlier, haystack boiler.{{sfn|Harris, Model Boilers|page=54}} * '''Niclausse boiler''': a field-tube boiler, with the field-tubes set at a shallow angle to horizontal.<ref name="Naval Annual (1896), RN boiler trials" />{{sfn|Harris, Model Boilers|pages=63,65}} * '''Normand boiler'''{{anchor|Normand boiler}}: an early three-drum boiler used mainly by the French Navy.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}}<ref name="Cisin, Modern Marine Engineering, Normand" >{{cite book |title=Modern Marine Engineering |last=Cisin |first=Harry G. |url=https://books.google.com/books?id=WWqU8kM5dHsC&q=normand+boiler&pg=PA84 |publisher=Van Nostrand |location=New York |orig-year=1921 |year=2008 |ref=Cisin, Modern Marine Engineering |pages=84 |isbn=9780559034237 }}</ref> * '''Normand-Sigaudy boiler''': a siamesed Normand boiler, for larger ships.<ref name="Robertson, Water-tube boilers, Normand-Sigaudy" >{{cite book |title=Water-tube boilers |first=Leslie S. |last=Robertson |year=1901 |url=https://archive.org/stream/watertubeboiler01robegoog/watertubeboiler01robegoog_djvu.txt |pages=38 |ref={{harvid|Robertson, Water-tube boilers}} }}</ref> | [[File:Normand boiler (Britannica, 1911).png|center|thumb|upright=0.8|Normand boiler|alt=End and side views of the Normand three-drum water-tube boiler. The convoluted curved shape of the tubes can be seen. Also the hemispherical domed ends to the drums, and the separate steam dome above.]] |}

== O == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''One Atmosphere Boiler'''{{anchor|One Atmosphere Boiler}}: A compact boiler capable of producing superheated steam to over 1000C at one atmosphere's pressure.<ref name="One Atmosphere Boiler's manufacturer" >{{cite web |title=One Atmosphere Boiler - Superheated Steam Boiler |url=http://www.mhi-inc.com/oab-superheated-steam-generator.html |publisher= Micropyretics Heaters Industrial }}</ref>

== P == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Paris boiler''':{{sfn|Harris, Model Boilers|pages=63–64}} * '''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. | |}

== R == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895" style="vertical-align: top;" |

* '''Ramzin boiler'''{{anchor|Ramzin boiler}} or 'straight-through boiler': a once-through monotube boiler with a water-wall furnace. It was distinguished from similar boilers, such as the Benson, by its use of near-horizontal tubes in a shallow helix.<ref>{{Cite book |title=Steam Power Engineering |author=Seikan Ishigai |publisher=Cambridge University Press |year=1999 |isbn=0521135184 |url=https://books.google.com/books?id=d-IAtrEQ958C&pg=PA35 |pages=33–35 }}</ref> It was invented by the Russian Leonid Ramzin, whilst imprisoned in a sharashka. * '''Rastrick boiler'''{{anchor|Rastrick boiler}}: a vertical heat-recovery boiler, typically used in ironworks. Owing to the conditions of their use, they acquired a poor reputation for safety and explosions.{{sfn|McEwen, Historic Steam Boiler Explosions|pages= }} * '''Reed boiler'''{{anchor|Reed boiler}}: An early naval water-tube boiler.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}} * '''return-flue boiler''': flued boiler with a single large flue that folds back on itself. Used in early steam locomotives. * '''return-tube boiler'''{{anchor|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. * '''Robertson boiler''' * '''round-topped boilers''' are a form of locomotive boiler, where the outer wrapper of the firebox is a semi-circular continuation of the cylindrical boiler barrel.

|  [[File:Return flue boiler.jpg|center|thumb|upright=0.8|'''return-flue''' boiler]] center|thumb|upright=0.8|'''Robertson''' boiler |}

== S == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''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.<ref name="Loco loco, Schmidt" >{{cite web |title=Schmidt high-pressure system |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/hptech.htm |publisher= Loco Locomotive gallery }}</ref> * '''Scotch marine boiler'''{{anchor|Scotch boiler}} * '''Scott boiler''':{{sfn|Harris, Model Boilers|pages=167-168}} * '''Sentinel boiler'''{{anchor|Sentinel boiler}} * '''Sentinel-Cammel boiler''' * '''Sentinel-Doble boiler'''{{anchor|Sentinel-Doble boiler}} * '''Shand & Mason''':{{sfn|Harris, Model Boilers|page=57}} * '''shell boiler'''{{anchor|shell boiler}}: * '''small-tube water-tube boiler'''{{anchor|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. * '''{{visible anchor|Smithies boiler}}''': A development of the pot boiler with added watertubes, used for model steam locomotives.{{sfn|Harris, Model Boilers|pages=169-171}} 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.<ref>{{Cite book |title=Model Steam Locomotives |last=Greenly |first=Henry |author-link=Henry Greenly |publisher=Cassell |year=1922 |pages=52–56 }}</ref> 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. * '''Spanner boiler''': a vertical multitubular fire-tube boiler, notable for its use of "Swirlyflo" fire-tubes.{{sfn|Milton, Marine Steam Boilers|pages=130-132}} Spanner boilers were also known for their use as train-heating boilers. * '''spherical boiler''':<ref>{{citation |last=Hills |first=Richard Leslie |author-link=Richard L. Hills |title=Power from Steam: A History of the Stationary Steam Engine |publisher=Cambridge University Press |year=1989 |pages=130–131 |isbn=978-0-521-45834-4 |url=https://books.google.com/books?id=t6TLOQBhd0YC}}</ref> * '''Stanley steam-car boiler''': an extremely compact vertical multitubular fire-tube boiler, used in the Stanley steam car. * '''Steam generator'''{{anchor|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.<ref name="Naval Marine Engineering Practice, 1971" >{{cite book |title=Naval Marine Engineering Practice |volume=1 |year=1971 |orig-year=1959 |publisher=Royal Navy, via HMSO |isbn=0-11-770223-4 |pages=8–10}}</ref> * '''Stirling boiler''': an early large-water-tube boiler, used in large stationary installations. * '''Stone-Vapor''': a monotube forced-circulation steam generator formed of a single helical water-tube.<ref name="Naval Marine Engineering Practice, 1971" /> * '''Straker boiler'''{{anchor|Straker boiler}}: a vertical water-tube boiler for the Straker steam wagon. * '''submerged multi-tube boiler''': a vertical multi-tubular fire-tube boiler, with the boiler shell extended upwards in an annular ring, so as to always maintain the whole length of the tubes submerged. Used in steam wagons and similar, where the water-level may be disturbed as the vehicle climbs a hill.{{sfn|Harris, Model Boilers|page=51}} * '''Sulzer boiler''': a monotube "once-through" steam generator.{{sfn|Milton, Marine Steam Boilers|pages=143-144}} |  center|thumb|upright=0.8|'''Scotch marine boiler''' |}

== T == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''three-drum boiler'''{{anchor|three-drum boiler}}: water-tube boilers with three drums in a triangular arrangement. The best known of these are the Yarrow and Admiralty patterns. Lesser-known examples are the Normand and Mumford. * '''Thornycroft boiler'''{{anchor|Thornycroft boiler}}: Several variants of an early naval water-tube boiler.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}}<ref name="Stokers Manual, 1912" >{{cite book |title=Stokers Manual |publisher=Admiralty, via HMSO, via Eyre & Spottiswoode |year=1901 |edition=1912 }}</ref> Also a small annular water-tube boiler used in Thornycroft's steam wagons. * '''Thornycroft-Schulz boiler''': a development of the marine Thornycroft boiler. * '''Thuile locomotive'''{{anchor|Thuile locomotive}}: a unique variant of the Flaman boiler using a barrel that was an elongated figure-8 section rather than circular.<ref name="Loco loco, Thuile" >{{cite web |title=Thuile |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/thuile/thuile.htm |publisher= Loco Locomotive gallery }}</ref> * '''transverse boiler''':{{anchor|transverse boiler}} A boiler with the drum mounted sideways in a vehicle, such as that used by the Yorkshire Patent Steam Wagon Co. |- |}

== V == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Vanderbilt boiler'''{{anchor|Vanderbilt boiler}} An American design, similar to the Lentz and large launch-type boilers.<ref name="Ahrons, Lentz"/> * '''Velox boiler'''{{anchor|Velox boiler}}:<ref name="Loco loco, Velox" >{{cite web |title=Velox locomotive |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/velox/velox.htm |publisher= Loco Locomotive gallery }}</ref> * '''vertical boiler'''{{anchor|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. * '''vertical fire-tube boiler'''{{anchor|vertical multi-tubular boiler}}: a vertical multi-tube fire-tube boiler. |- |}

== W == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''wagon boiler'''{{anchor|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. * '''water-tube boiler'''{{anchor|water-tube boiler}} * '''Woolnough boiler'''{{anchor|Woolnough boiler}}: a three-drum water-tube boiler used by Sentinel.<ref>{{Cite web |title=The Colombian Steam Motor Locomotive |author=Douglas Self |author-link=Douglas Self |url=http://www.douglas-self.com/MUSEUM/LOCOLOCO/colombia/colombia.htm |website=Loco loco gallery }}</ref><ref>{{cite web |url=https://steamindex.com/manlocos/sentinel.htm|title=Sentinel locomotives & railcars |website=SteamIndex |access-date=10 April 2018 }}</ref> * '''White boiler'''{{anchor|White boiler}}: An early naval water-tube boiler.<ref name="Naval Annual (1896), RN boiler trials" />{{sfnp|Brown|1997|page=140}} * '''White-Forster boiler''' * '''White steam-car boiler''': a monotube boiler, used in the White steam car. * '''Woodeson boiler''': a form of bundled-tube water-tube boiler.<ref>Britannica, 1911{{full citation needed|date=December 2020}}</ref> * '''Woolf boiler''':{{sfn|Hills|1989|page= }}{{page needed|date=December 2020}}{{sfn|Harris, Model Boilers|page=36}} |- |}

== Y == {| class="wikitable" |- ! Definitions  ! Points of Interest  |- |width="895"|

* '''Yarrow boiler'''{{anchor|Yarrow boiler}}:<ref name="Naval Annual (1896), RN boiler trials" /><ref name="Stokers Manual, 1912"/><ref>{{cite book |title=The Book of Modern Engines and Power Generators |year=1912 |last=Kennedy |first=Rankin |publisher=Caxton |location=London |volume=VI |ref={{harvid|Kennedy, Modern Engines, Vol VI}} }}</ref>{{page needed|date=December 2020}}{{sfn|Milton, Marine Steam Boilers|pages=108-111}}<ref name="Yarrow, First Hundred Years, Yarrow boilers" >{{cite book |title=Yarrows: the first hundred years. |last=Borthwick |first=Alastair |year=1965 |publisher=Yarrows |ref={{harvid|Yarrows, First Hundred Years}} }}</ref> * '''Yorkshire steam wagon boiler'''{{anchor|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. |  center|thumb|upright=0.8|'''Yarrow boiler''' thumb|upright=0.8|center|Yorkshire steam wagon |} {{compact ToC|side=yes|top=yes|num=no}}

== References == {{reflist}} *{{cite book |title=Marine Steam Boilers |last=Milton |first=J. H. |publisher=Newnes |edition=2nd |orig-year=1953 |year=1961 |ref={{harvid|Milton, Marine Steam Boilers}}}}

Category:Fire-tube boilers Category:Water-tube boilers Category:Steam boilers Category:Boilers Category:Steam power