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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 ...
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.
A fireless steam locomotive is similar to a conventional steam locomotive, but has a reservoir, known as a steam accumulator, instead of a boiler. This reservoir is charged with superheated water under pressure from a stationary boiler. The engine works like a conventional steam engine using the high pressure steam above the water in the ...
The P 8 benefited especially from superheated steam technology, which had just been developed by Wilhelm Schmidt (nicknamed 'Hot Steam Schmidt'), that led to outstanding performance for those times. The P 8 was a very economical locomotive that did not make great demands on the ability of the engine driver.
In general, the steam economy is roughly proportional to the specific volumes of saturated and superheated steam at the pressure of generation. [Thus] the operating range of any given [steam] engine is increased; this is of especial benefit to tank engines and to all engines working in areas where fuel is expensive or water is scarce.
The boiler pressure was 200 lbf/in 2 (1,400 kPa), but whilst the boiler was under repair, the locomotive used a 175 lbf/in 2 (1,210 kPa) boiler from 1910 to 1912. This locomotive was withdrawn in 1927 and scrapped in 1928. [9] No. 1300, another four-cylinder compound, was an experimental locomotive which differed greatly from all of the others.
Built in Glasgow in 1929 by the North British Locomotive Company (NBL), [1] it was one of a number of steam locomotives built around the world in the search for "Superpower steam". The locomotive was a joint venture between the LMS, with Henry Fowler as chief mechanical engineer (C.M.E.), and The Superheater Company, [2] with the latter having ...
Engines with a medium power rating were given the number 3. Saturated steam engines were given odd, and superheated steam locomotives even, numbers. The individual locomotive groups were given a specific range of numbers, that often differentiated between two-cylinder (Zwillings-) and compound locomotives.
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