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Wärtsilä medium-speed engines - 20 Pages

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Catalogue excerpts

WÄRTSILÄ MEDIUM-SPEED ENGINES

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The Oasis of the Seas, equipped with six Wärtsilä 46 engines. The Thetis, equipped with a Wärtsilä 20 engine. The submersible heavy load ship Blue Marlin is equipped with three Wärtsilä 8L32 engines. POWER RANGE FOR WÄRTSILÄ MEDIUM­SPEED ENGINES DIESEL ENGINES Wärtsilä 20 Wärtsilä 26 Wärtsilä 32

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The LNG Tanker, GDF-Suez Global Energy is equipped with four Wärtsilä 50DF engines. The Naval vessel De Zeven Provincien is equipped with two Wärtsilä 16V26 engines. The tanker Bitflower is equipped with a Wärtsilä 6L38 engine. MEDIUM-SPEED DIESEL AND DUAL-FUEL ENGINES FOR RELIABILITY AND TOTAL ECONOMY The design of the Wärtsilä medium-speed engine range is based on the vast amount of knowledge accumulated over years of successful operation. Robust engines and generating sets, developed from pioneering heavy fuel technology, have been engineered to provide unquestionable benefits for the owners...

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COMPLIANCE WITH ENVIRONMENTAL REGULATIONS AND OTHER STANDARDS Environmental issues, especially emissions reduction and fuel consumption, have become increasingly important in the shipping sector where enforcement of environmental regulations, at both global and local levels, has notably increased. This puts pressure on the marine industry to constantly explore new ways of reducing the environmental impact of ships. Wärtsilä creates added value for its customers by providing products, solutions and services that fulfill their needs and expectations. The development of highquality, reliable, and...

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ENGINE PERFORMANCE Wärtsilä 4-stroke engines utilize the latest developments in turbo-charging technology, which enables Miller valve timing and the Variable Inlet Valve Closing (VIC) system to be employed. At full-load operation, early closure of the inlet valves enables a low effective compression ratio, and as a result, comparatively low temperatures at the end of the compression stroke. The charge air, being both somewhat expanded and cooled on its way through the receiver into the cylinders, has a low global temperature that is still high enough to guarantee reliable and stable ignition of...

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ENGINE DESIGN ENGINE BLOCK Nodular cast iron is the natural choice for engine blocks today because of its strength and stiffness properties. Wärtsilä engine monoblock designs are based on modern foundry technology to integrate most oil and water channels, as well as the charge air receiver. The result is a virtually pipe-free engine with a clean outer exterior. Resilient mounting, available as an option, is required in many application types. The engine block has been designed especially for this purpose. Integrated channels designed with this in mind serve a double purpose. CRANKSHAFT AND BEARINGS...

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both strength and weight. The shank is fully machined. The three-piece design simplifies piston overhauling, as this can be carried out without touching the big end bearing. The big end bearing can also be inspected without removing the piston. The two-piece design is used for smaller engines having a cylinder power of less than 400 kW. The design offers the maximum pin diameter while still making it possible to pull the connecting rod through the cylinder liner. The main features of the connecting rod design are: Two/three-piece type design depending on engine size Hydraulically tightened bolts...

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PISTON & PISTON RINGS For years, the outstanding piston concept for highly rated heavy fuel engines has been a rigid composite piston with a steel crown and nodular cast-iron skirt. More than twenty years of experience has fine-tuned this concept. When it comes to reliability, there is no real alternative today for modern engines with high cylinder pressures and combustion temperatures. Wärtsilä’s patented skirt lubrication minimizes frictional losses, and ensures the appropriate lubrication of both piston rings and the piston skirt. In Wärtsilä’s three-ring concept each ring has a specific task....

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MULTI-DUCT A multifunctional duct is connected to the cylinder head. The functions of this multi-duct are as follows: transfer from air receiver to cylinder head Air Introduction of an initial swirl to the inlet air for optimal part load combustion Exhaust transfer to the exhaust system Cooling water transfer from the cylinder head to the return channel in the engine block Insulation/cooling of the exhaust transfer duct Support for the exhaust system, including insulation CAMSHAFT AND VALVE GEAR The engine is available with either traditional mechanical valve actuation, or variable inlet valve...

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OPERATIONAL SYSTEMS FUEL INJECTION SYSTEM The patented Wärtsilä multi-housing principle ensures outstanding safety of the low-pressure fuel system. The fuel line consists of channels drilled in cast parts, which are clamped firmly to the engine block. For easy assembly and disassembly, these parts are connected to each other using slide connections. Wärtsilä 4-stroke engines are available with three alternative fuel injection systems depending on configuration: a conventional fuel injection system, with either single- or twin plunger injection pumps, and commonrail fuel injection. High injection...

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injection nozzles are totally unloaded between injection periods. This feature eliminates the risk of unintended fuel supply into the cylinders caused, for example, by incomplete closure of the nozzle needle at the end of injection. The twin-pump system, likewise, offers the possibility to optimize the prevailing engine operating conditions, fuel characteristics and emission levels, thanks to twin plunger pump elements. One plunger controls the quantity of fuel while the other controls the injection timing. TURBOCHARGING SYSTEM Turbocharger technology has undergone intense design and performance...

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Central cooler Pre­ heater HT stand­by pump PRINCIPLE LAYOUT OF THE COOLING SYSTEM. Oil cooler Automatic filter Electric stand­by oil pump Electric pre­lube oil pump Suction strainer PRINCIPLE LAYOUT OF THE LUBRICATING SYSTEM. COOLING SYSTEM The cooling system on the engine is split into two separate circuits: high-temperature (HT) and low-temperature (LT). The cylinder liner, the cylinder head, and the first stage in the charge air cooler are all connected to the HT circuit. The lubricating oil cooler and the second stage in the charge air cooler are connected to the LT circuit. The amount of...

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