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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 ...
Indicator diagram for steam locomotive [3] Specifically, the diagram records the pressure of steam versus the volume of steam in a cylinder, throughout a piston's cycle of motion in a steam engine. The diagram enables calculation of the work performed and thus can provide a measure of the power produced by the engine. [4]
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 ...
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.
Engine No 6, also called The Sir William Prescott, has been restored to running order and is the largest fully operational triple-expansion steam engine in the world. [4] It may be seen in steam on various weekends throughout the year, and as a static display every Sunday between March and November. [ 5 ]