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The Schmidt-Henschel boiler was replaced with a tapered boiler, with a drumhead smokebox, designated type 2. [1] The type 2 boiler had a tube surface of 1,669 square feet, formed by tubes 2 + 1 ⁄ 8 inches (54 mm) in diameter and 14 ft 3 in (4.34 m) long. [2] It was fitted with a 28-row superheater with 360 square feet (33 m 2) of heating ...
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.
When DHW is used, a combination boiler stops pumping water to the heating circuit and diverts all the boiler's power to heating DHW. Some combis have small internal water storage vessels combining the energy of the stored water and the gas or oil burner to give faster DHW at the taps or to increase the DHW flow rate.
This table summarises the classes that developed from Churchward's proposals. It is simplified in that it suggests the classes were sets of identical engines, whereas the prototypes often differed in some respects from later class members, and there was a constant move to improve the locomotives by changing boilers, enlarging cylinders and tweaking other details of their construction.
These burned diesel fuel, which is a lightweight fuel oil. The term steam generator (as opposed to boiler) usually refers to an automated unit with a long spiral tube that water is pumped through and is surrounded by flame and hot gases, with steam issuing at the output end. There is no pressure vessel in the ordinary sense of a boiler.
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