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Double-acting triple-expansion marine engine. High-pressure steam (red) passes through three stages, exhausting as low-pressure steam (blue) to the condenser. It is a logical extension of the compound engine (described above) to split the expansion into yet more stages to increase efficiency. The result is the multiple-expansion engine.
A simple engine is an engine that operates with single expansion of steam, regardless of the number of cylinders fitted to the engine. Up until about the mid-19th century, most ships had engines with only one cylinder, although some vessels had multiple cylinder simple engines, and/or more than one engine.
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 engines in the golden age of steam. These examples and compound turbines are the main but not the only uses of compounding in engines, see below.
At the 1862 International Exhibition Humphrys, Tennant and Dykes showed details of the 4-cylinder expansion engines for the Peninsular & Oriental Steam Navigation Company's ship Mooltan. [2] The cylinders were steam jacketed and arranged in pairs using the Woolf compound system, with the smaller (43 inch diameter) cylinder being above the ...
It is a logical extension of the compound engine (described above) to split the expansion into yet more stages to increase efficiency. The result is the multiple-expansion engine. Such engines use either three or four expansion stages and are known as triple-and quadruple-expansion engines respectively. These engines use a series of 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 ]
The triple-expansion steam engine cylinders, located on the second story of the engine, are supported by six vertical and six diagonal columns, creating space for three vertical pistons to move up and down. The vertical rods with 6-foot (1.8 m) stroke from the engine drive a horizontal crankshaft which is also
The Willans engine or central valve engine was a high-speed stationary steam engine used mainly for electricity generation around the start of the 20th century. Willans' engine was one of the best-known examples of the steeple compound engine . [ 1 ]