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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 high-pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal for other locomotives. Most locomotives operate with a steam pressure of 200 to 300 psi (1.38 to 2.07 MPa). [1] In the later years of steam, boiler pressures were typically 200 to 250 psi (1.38 to 1.72 MPa).
The H02 1001 locomotive was the only example of the Schwarzkopff-Löffler high-pressure boiler system, a complex technology in which heat was extracted from the firebox by tubes filled with steam rather than boiling water. It was delivered in 1930 to the Deutsche Reichsbahn (DRG).
Horizontal tubular vessel, strong enough to contain high-pressure steam in a harsh working environment; closed at either end by the firebox and tube plate. Usually well filled with water but with space for steam – produced by heat from the firebox and boiler tubes – to be above the water surface. [1] [2] [5] [3]: 9 Superheater tubes
The steam is then passed through a number of superheater elements, which are long pipes placed inside the larger diameter fire tubes, called flues. Hot combustion gases from the locomotive's fire pass through the flues and, as well as heating the water in the surrounding boiler, they heat the steam inside the superheater elements they flow over.
The Schmidt steam-raising boiler was a 3-stage unit. The primary generator was a fully sealed ultra-high-pressure circuit working between 1,400–1,800 psi (9.65–12.41 MPa), filled with distilled water that transferred heat from the firebox to the high-pressure drum. This raised high-pressure steam at 900 psi (6.21 MPa) which was taken to ...