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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.
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 ...
An animation of a simplified triple-expansion engine. High-pressure steam (red) enters from the boiler and passes through the engine, exhausting as low-pressure steam (blue), usually to a condenser. It is a logical extension of the compound engine (described above) to split the expansion into yet more stages to increase efficiency.
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.
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 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 ]
Waverley is powered by a three-crank diagonal triple-expansion marine steam engine built by Rankin & Blackmore, Engineers, Eagle Foundry, Greenock, Scotland. [19] It is rated at 2,100 IHP and achieved a trial speed of 18.37 knots (34.02 km/h; 21.14 mph) at 57.8 rpm. Passengers can watch this engine from passageways on either side of the engine ...
The engine itself is of an unusual triple-expansion, three-crank rocker design, with pistons 13.7, 24.375, and 39 inches (348.0, 619.1, and 990.6 mm) in diameter and 6-foot (1.8 m) stroke. Each rocker is connected both to a crankshaft with a 15-foot (4.6 m) flywheel and to a double acting pump's plunger.