SERVICE SPECIFICATION DNVGL-SE-0074 Edition December 2014 Type and component certification of wind turbines according to IEC 61400-22 The electronic pdf version of this document found through http://www.dnvgl.com is the officially binding version. The documents are available free of charge in PDF format. DNV GL AS FOREWORD DNV GL service specifications contain procedural requirements for obtaining and retaining certificates and other conformity statements to the objects, personnel
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engineers Noha Magdy and Ashraf Brdwyli to help us in the project. 3 ABSTRACT Wind energy is fast becoming the most preferable alternative to conventional sources of electric power. wind turbines are now coming up in almost all parts of the world. In the early days of development, wind turbines were designed to rotate at constant speed through pitch control or stall control. Wind electrical generation systems are the most cost-competitive of all the environmentally clean and safe renewable
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Wind Power in Global Community The energy obtained from the wind power is renewable and it could preserve and extend the uses of the exhaustible sources of energy like oil, natural gas, coal and uranium for other purposes. “Free input and cheap output” technology could be beneficial to many countries. Currently, five countries – Germany, USA, Denmark, India and Spain – concentrate more than 83% of worldwide wind energy capacity in their countries. The utilization of this renewable source of
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▪ Description [pic] ▪ Executive Summary ▪ Content Page ▪ Introduction The commercial aircraft engine consists of 3 major modules namely the Fan, Core and the Low Pressure Turbine (LPT). Each module will then be split into sub modules before it is stripped into individual parts. The engine is made up of thousands of parts put together and a typical shop visit (input, repair/upgrade, assembly, testing) will take approximately 60 days to complete. The
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Poster PO-39 NATURAL GAS LIQUEFACTION PROCESSES COMPARISON COMPARAISON ENTRE PROCEDES DE LIQUEFACTION DE GAZ NATUREL Pierre-Yves Martin Jérôme Pigourier Axens (France) www.axens.fr Béatrice Fischer IFP (France) ABSTRACT This paper presents Axens efforts to compare LiquefinTM with the competing process, specially the reputed most efficient ones: C3/MR, C3/MR followed by nitrogen cycle, dual mixed refrigerant process with spiral wound exchangers. To compare properly one process to another, it
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Propeller Turbine to Full Kaplan Operation at Michigamme Falls By Gerard J. Russell, P.E., American Hydro Corp., York, Pennsylvania, USA, Craig Peterson, P.E., American Hydro Corp., York, Pennsylvania, USA, and Douglas T. Eberlein, P.E., We Energies, Milwaukee, Wisconsin, USA ABSTRACT FERC license renewal stipulations for We Energies’ Michigamme Falls plant included new flow constraints that were outside the existing fixed-blade propeller turbines’ efficiency range. One of the turbines was converted
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requires steady boiler and main steam line pressure over the entire load range. At part load, the steam turbine requires a lower pressure and flow to generate the amount of power needed. The operational system where the boiler provides only the required amount of steam and pressure to meet the demand without any throttling, is referred to as “sliding pressure.” Most steam generators and turbines in combined cycle applications operate in this mode. For SC and USC, the sliding pressure method used
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2013 Hydro turbine Runner Design and Manufacturing Fatma Ayancik, Umut Aradag, Ece Ozkaya, Kutay Celebioglu, Ozgur Unver, and Selin Aradag Abstract—This research describes a methodology for the parametric design, computational fluid dynamics (CFD) aided analysis and manufacturing of a Francis type hydro turbine runner. A Francis type hydro turbine consists of five components which are volute, stay vanes, guide vanes, runner and draft tube. The hydraulic performance of the turbine depends on the
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“computer” of sorts uses many data sensors located on the engine in key information locations such as engine revolutions, intake air temperature, exhaust gas temperature and turbocharger boost pressure. The most important information is the turbocharger boost pressure. The turbocharger uses the spent exhaust gas from the engine to drive a turbine which intern pressurizes the air entering the intake of the engine. This extra power is called, “free power” since it does not use any power from the engine
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temperature b) suction presuure > vapor pressure of liquid at that temperature c) suction pressure = vapor pressure d) suction pressure = developed head 3. Centrifugal pumps are normaly used for pumping a) Gas b) Liquids c) Gas & Liquid mixture 4. Check valve is used for a) Very precise control of flow b) Unidirectional flow c) Multidirectional flow d) None of these 5. Purpose of relief valve in a reciprocating pump is to
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