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The result from 1880 onwards was the multiple-expansion engine using three or four expansion stages (triple-and quadruple-expansion engines). These engines used a series of double-acting cylinders of progressively increasing diameter and/or stroke (and hence volume) designed to divide the work into three or four, as appropriate, equal portions ...
Period cutaway diagram of a triple-expansion steam engine installation, circa 1918. This particular diagram illustrates possible engine cutoff locations, after the Lusitania disaster and others made it clear that this was an important safety feature. A marine steam engine is a steam engine that is used to power a ship or boat.
In a compound steam locomotive, the steam passes from the high-pressure cylinder or cylinders to the low-pressure cylinder or cylinders, the two stages being similar. In a triple-expansion steam engine, the steam passes through three successive cylinders of increasing size and decreasing pressure. Such engines were the most common marine ...
Humphrys, Tennant and Co. also designed the boilers, each ship having a total of 8 boilers of 15-foot diameter with optional forced draft providing steam at 135 psi. HMS Blenheim was fitted with four triple-expansion engines giving her 20,000 indicated horsepower and a top speed of 22 knots. The forward engines could be disconnected to increase ...
The solution was the triple expansion engine, in which steam was successively expanded in a high pressure, intermediate pressure and a low pressure cylinder. [ 27 ] : 89 [ 28 ] : 106-111 The theory of this was established in the 1850s by John Elder , but it was clear that triple expansion engines needed steam at, by the standards of the day ...
The Scotch marine boiler achieved near-universal use throughout the heyday of steam propulsion, particularly for the most highly developed piston engines such as the triple-expansion compounds. It lasted from the end of the low-pressure haystack boilers in the mid-19th century through to the early 20th century and the advent of steam turbines ...
Cross compound engine, with an expansion valve (top) on the high-pressure cylinder. An expansion valve is a device in steam engine valve gear that improves engine efficiency. It operates by closing off the supply of steam early, before the piston has travelled through its full stroke. This cut-off allows the steam to then expand within the ...
Willans & Robinson engine, driving a dynamo generator. One of the best-known examples of the steeple engine was the Willans engine. [10] These were double- or triple-expansion compound engines, with the unusual features of single-acting cylinders and a central spindle valve shared between all cylinders.