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The last major passenger ship built with steam turbines was Fairsky, launched in 1984. Similarly, many steam ships were re-engined to improve fuel efficiency. One high-profile example was the 1968 built Queen Elizabeth 2 which had her steam turbines replaced with a diesel-electric propulsion plant in 1986.
A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II .
Nuclear ships almost always use a turbine to harness the energy of the steam that they produce. Steam Driven turbines can either be used to directly power the vessel by means of transmission and gearing to a propeller, or the turbine can be used to generate electricity that is then used to power electric propulsion motors. [citation needed]
Today, propulsion steam turbine cycle efficiencies have yet to break 50%, yet diesel engines routinely exceed 50%, especially in marine applications. [40] [41] [42] Diesel power plants also have lower operating costs since fewer operators are required. Thus, conventional steam power is used in very few new ships.
The Invincible-class battlecruisers all used Parsons propulsion systems. In 1944, Parsons was one of 19 companies which formed the 'Parsons and Marine Engineering Turbine Research and Development Association', usually known as Pametrada. The destroyer HMS Glamorgan, launched in 1964, [2] had a Parsons propulsion system.
While steam turbine-driven merchant ships such as the Algol-class cargo ships (1972–1973), ALP Pacesetter-class container ships (1973–1974) [37] [38] and very large crude carriers were built until the 1970s, the use of steam for marine propulsion in the commercial market has declined dramatically due to the development of more efficient ...
An alternative to the steam turbine engine is the dual-fuel marine diesel engine. Commercial ship propulsion system manufacturers such as Finland's Wärtsilä and Germany's MAN Diesel are producing large bore dual-fuel diesel engines. The MAN B&W ME-GI Engines have extremely flexible fuel modes that range from 95% natural gas to 100% HFO and ...
If the turbines do not drive a propeller shaft directly and instead a turbo-electric transmission is used, the system is known as COGES (combined gas turbine-electric and steam). COGAS differs from many other combined marine propulsion systems in that it is not intended to operate on one system alone.