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Wartsila-O-E-W-X35 - 2 Pages

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Catalogue excerpts

Wärtsilä X35 The Wärtsilä X35 is the smallest lowspeed engine in Wärtsiläs portfolio. It is an electronically controlled marine low-speed two-stroke engine which can be classed as one of the most efficient in its category. The main targets when designing the Wärtsilä X35 was the powering of vessels with shallow draught requirements, compact engine dimensions and simple engine operation. The Wärtsilä X35 is a marine diesel engine with a 350 mm cylinder bore. The power output is in the range of 3,475 to 6,960 kW and the engine is available in 5–8 cylinder configurations. TYPICAL APPLICATION AREAS The Wärtsilä X35 is highly suited for the direct-drive propulsion of a wide range of small and medium-sized cargo vessels, such as bulk carriers, tankers and container feeders. The layout field provides flexibility in desired power/speed point selection, which is especially important for vessels operating in very shallow draught and have propeller diameter restrictions. The new engine offers fuel consumption benefits of up to 3% compared with a conventional mechanical main engine, depending on the sailing profile. OPERATIONAL FEATURES The engine offers high efficiency due to the high stroke-to-bore ratio. Wärtsilä’s well proven electronically controlled common-rail technology plays a key role in enabling ship owners to reduce fuel costs, mainly through the flexibility of the fuel injection and exhaust valve operations. A unique feature of Wärtsilä low-speed electronically controlled engines is the possibility to control each fuel injector separately. This flexibility results in lower fuel consumption across the entire operating range, especially at low and part loads. In addition, different engine tunings are available in order to meet specific requirements according to the customers’ particular needs (standard, delta and low load). Other advantages of this technology include stable low running speeds (down to 12% of nominal speed), smokeless operation, and improved control of exhaust emissions. For cylinder lubrication, an oil feed rate of 0.6 g/kWh can be achieved. ENVIRONMENTAL COMPLIANCE The engine is fully compliant with IMO Tier II requirements. It can also be equipped with a SCR catalyst to meet IMO Tier III NOX emission levels, and a scrubber to reduce SOX emissions to 0.1% – even with high sulphur fuels. The introduction of the EEDI index also puts an emphasis on CO2 emissions and total vessel efficiency. The internal engine efficiency of Wärtsilä X35, and the possibility to apply various Power Take Off (PTO) arrangements for onboard electricity production, make it easy for shipyards to meet these new requirements. Thanks to Wärtsilä’s common-rail technology, the engine has no visible smoke at any load. TOTAL COST OF OWNERSHIP Minimum total cost of ownership can be achieved by low engine and operational costs during the lifetime of the engine. The Wärtsilä X35 is designed for exceptional reliability and for long periods of maintenance-free operation. It also allows extended Time Between Overhaul (TBO) of the critical components, to as much as 5 years. The service-friendly design will reduce downtime, maintain vessel operation and cut operating costs.

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The key benefits of the Wärtsilä X35 include: • A particularly high stroke-to-bore ratio offering outstanding engine efficiency • Economical fuel consumption over the whole operating range/low cylinder oil consumption • Operational simplicity • Layout field providing flexibility in desired power/speed point selection • Stable operation down to 10–12% of nominal engine speed for easier manoeuvring WÄRTSILÄ X35 IMO Tier II Main data: Cylinder bore Piston stroke Speed Mean effective pressure at R1 Piston speed Fuel specication: Fuel oil 700 cSt/50°C ISO-F 8217:2005, category ISO-RMK700 Cyl. 350 mm...

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