By C. M. Reed, Ernesto Cumpian, Don Greer, Andrew Probert
H-53 Sea Stallion In motion КНИГИ ;ВОЕННАЯ ИСТОРИЯ H-53 Sea Stallion In motion (Aicraft quantity 174)ByChris ReedPublisher:Squadron/Signal courses Inc.2000 52PagesISBN: 0897474171PDF15 MBThe strongest helicopter in carrier with the united states army, the Sikorsky H-53 has served with contrast with the Marine Corps. Air strength, and military due to the fact that its first flight in 1964. each significant clash given that Vietnam has obvious H-53s interested by a way. both bringing males and gear into hassle spots, rescuing downed aircrews, evacuating civilians, or sweeping for mines. whereas older examples were retired, the more moderen CH-53E and MH-53K types, jointly w ith the lengthy serving and often-rebuilt Air strength PAVE LOWs. will proceed in service for future years. sharingmatrixletitbit zero
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Owing to very low usage of aviation gasoline today , the number of grades was reduced to three , but has recently increased to four. Aviation gasoline , to be versatile and non-restrictive in its use, requires very closely controlled volatility limits indicated by the Reid vapour pressure and the distillation tests . This immediately restricts the components that can he used in its production. The fact that the performance requirements are high still further reduces the available components. Because of the low quantity requirements and the limitation on the type of components that may be used, very few refineries now produce aviation gasoline at all, probably only four or five in Europe and the Middle East.
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The techniques are similar in both cases, but the solvents are different. The basis of the process is that the feed , which has been pre-heated, is mixed with the lean solvent in an extraction unit. The aromatics dissolve in the solvent , and the raffinate leaves the top of the extractor. The aromatics-rich solvent leaves the base of the extractor and goes to a column at a higher temperature and lower pressure. This boils off the non-aromatic hydrocarbons which pass overhead, and the bottom product passes to a stripper operating at about 190°C and reduced pressure.