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The class was introduced in 1928 and was a post-grouping development of the Midland Railway 483 Class with modified dimensions and reduced boiler mountings. The numbering continued from where the Midland engines left off at 563 and eventually reached 700. 138 were built, though numbering is slightly complicated by renumberings and transfers.
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. [3] Donkey boilers were also used by the last sailing ships for working winches and anchor capstans.
Vessels typically contained several engines for different purposes. Main, or propulsion engines are used to turn the ship's propeller and move the ship through the water. . The fire room got its name from the days when ships burned coal to heat steam to drive the steam engines or turbines; the room was where the stokers spent their days shoveling coal continuously onto the grates under the ...
The LNER then ordered a fifth batch of 13 to a modified design, incorporating reduced boiler mountings and detail differences, and these were built by the outside contractors Hawthorn, Leslie & Co. during 1925–26 (works numbers 3616–28). [2]
Some ships with Y100 Boilers were also converted to steam atomisation, HMS Cleopatra being one of them. The superheat temperature of the Y160 was controlled manually by the boiler room petty officer of the watch between 750–850 °F (399–454 °C) and the steam supplied to the main turbines was at a pressure of 550 psi (3,800 kPa).
The first two ships of the class to be completed, King George V and Prince of Wales, carried four HACS Mk IVGB directors for the ship's secondary 5.25-inch guns as well as six Mk IV pom-pom directors; all ten of these directors featured Gyro Rate Unit, tachymetric fire control.
The ship's engines and boilers were replaced by Parsons geared turbines and eight Admiralty three-drum boilers operating at 400 psi (2,758 kPa; 28 kgf/cm 2). [26] This saved some 2,800 long tons (2,800 t) of weight and allowed the two forward boiler rooms to be converted to 4.5-inch (110 mm) magazines and other uses.
However, the boiler-room layout was a continuing source of criticism, as a single well-placed hit could cripple a ship completely. In order to find a solution to these criticisms, it was originally planned that 32 ships (four flotillas) of an improved design would be built under the 1943 and 1944 Naval Estimates and that there would be changes ...
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