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Oil field engine : ウィキペディア英語版
Oil field engine

The term "Oil Field Engine" can refer to any sort of internal combustion engine used as a power source in the production of crude petroleum, but most commonly refers to a class of reciprocating engines built in the mid to late 19th and early 20th centuries, which is the focus of this article.
==Evolution==
With the drilling of the first commercially successful oil well by Edwin Drake in 1859, a new industry was born- one that would rapidly demand new technologies for extraction. Initially, the steam engine used for drilling the well was kept in-place to lift the oil to the surface. As the well's production dropped off, the economic feasibility of firing a boiler and maintaining a steam operation at each individual well fell far short of the income from the well's production (often only a fraction of a barrel per day.) The ideal solution was to install a new gas engine at each well, thus eliminating hours of preparatory work and large quantities of fuel required to steam a boiler for only a few hours of production. High initial cost prevented this in most cases, so it became much more feasible to convert an abundance of existing steam engines to gas engines. The idea of a converted engine is most commonly credited to Dr. Edwin J. Fithian, a Portersville, PA physician with a great interest in mechanics. His 1897 prototype for a 10-horsepower conversion cylinder was turned down by the Oil Well Supply Company of Oil City, PA, so in 1898 Dr. Fithian partnered with John Carruthers and formed the Carruthers-Fithian Clutch Company, with headquarters in Grove City, PA. The "half-breed" concept (as these engines- being half steam engine, half gas engine, were often referred to) was an immediate success, with an oil producer being able to convert a steam engine with a 10HP gas cylinder and clutch for $120.00. Soon after, multiple companies capitalized on the market for conversion cylinders, most producing a simple two-stroke gas cylinder to bolt onto a steam bedplate, thus avoiding patent infringement from Carruthers-Fithian (which by 1899 had formed the Bessemer Gas Engine Company in Grove City.) 〔Historical Sketch: 'Half-Breed Engines', Gas Engine Magazine http://gasengine.farmcollector.com/Gas-Engines/HISTORICAL-SKETCH-HALF-BREED-ENGINES.aspx〕 Other manufacturers produced engines that were purely of an internal-combustion design, and examples of both exist to this day.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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