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A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, in some steam engines, and in processes such as steam reforming. There are three types of superheaters: radiant, convection, and separately fired.
The engine worked as a two-cylinder simple on starting, changing over to compound expansion automatically. A superheater was fitted in 1914, and the engine was rebuilt as a two-cylinder simple in 1917; the new cylinders were outside, 20 by 26 in (510 by 660 mm) of the type used on class H3, driving the leading coupled wheels. It was withdrawn ...
In 1931, H1 No. 2162 was rebuilt as a 4-6-2T and given the A8 classification. After a series of trials throughout the North East Area, all of the remaining H1s were rebuilt as A8 4-6-2Ts between 1933 and 1936. During the process of rebuilding, the boiler was modified to include a Robinson-type superheater rather than the original Schmidt ...
The original Johnson locomotives were all subsequently renewed as Deeley compounds, including the now-preserved 1000 which was rebuilt and outshopped with a superheater in 1914. Numbered 1000–1044 by both the Midland and LMS companies, British Railways renumbered the Midland series of compounds 41000–41044 after nationalisation in 1948.
Superheated steam was widely used in main line steam locomotives. Saturated steam has three main disadvantages in a steam engine: it contains small droplets of water which have to be periodically drained from the cylinders; being precisely at the boiling point of water for the boiler pressure in use, it inevitably condenses to some extent in the steam pipes and cylinders outside the boiler ...
The water comes (8), and goes into pipes (9). Warmed by the combustion of the fuel (came in 3), steam bubbles forming in these pipes, and arrives in the drum (7). Then steam goes (through 6) in smaller pipes (10) and being superheated here. At last, superheated steam goes to engine room (5).
So there were three different variants of these two-cylinder, superheated steam engines in service with the Bundesbahn. DB Neubaulok 065 005-1 ready for scrapping, Frankfurt-am-Main, 1970. Class 65 locomotives proved to be exceptionally reliable engines, but they could not be used universally, because their coal bunkers and water tanks were small.
Museums relating to steam engines, or including a steam engine as a significant exhibit. Category to include: Museums featuring working steam engines; Steam-powered pumping stations; Industrial and science museums exhibiting collections of stationary steam engines; Collections of steam-powered road vehicles, fairground rides, boats, etc