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Wartsila-O-E-W-X72 - 2 Pages

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Catalogue excerpts

Wärtsilä X72 THE KEY BENEFITS OF THE WÄRTSILÄ X72 ARE: •• Extended rating field offers optimum propeller speed for different applications •• Low fuel consumption thanks to advantages stroke-bore parameters •• Proven Wärtsilä electronically controlled common-rail concept for high performance •• Reliability through proven main parameters •• Five years operation between overhauls •• Stable operation down to 12% nominal engine speed for easier manoeuvring . Engine power R1 100% 82% 75% R1+ R3 R4 R2+ R2 Optimum power and RPM for bulk carriers and tankers Optimum power and RPM for container vessels 78% Engine speed 94% 100% WÄRTSILÄ X72 CASE STUDY Suezmax route: West Africa – US Gulf Roundtrip comparison Currently available main engine (Reference) Wärtsilä 6X72 Sailing profile •• Laden leg: 15.9 knots/90% engine load •• Ballast leg: 13.5 knots/50% engine load Voyage assumptions •• Loading: West Africa •• Discharging: US Gulf •• Distance: 5774 nm/leg TYPICAL APPLICATION AREAS The Wärtsilä X72 has been designed as a main engine for Suezmax tankers, Capesize bulk carriers, as well as Panamax and SubPanamax container vessels. The new engine offers high levels of propulsion efficiency resulting from its lower engine revolutions. It also presents increased flexibility for selecting the most efficient propeller speed, thus giving minimized daily fuel consumption, by using the appropriate propeller diameter for the projected ship design and mission profile. When comparing the Wärtsilä X72 to currently available main engine options, a gain of approximately 7% in efficiency is achieved for Suezmax tankers and Capesize bulk carriers,. This is thanks to higher engine internal efficiency, higher FUEL COSTS/ROUNDTRIP (kUSD) 1000 900 kUSD The WÄRTSILÄ® X72 is designed with vessel efficiency and environmental friendliness in mind. EEDI regulations, low vessel emissions, and operational flexibility have been key considerations in designing the Wärtsilä X72 as the preferred engine for new merchant vessels. The Wärtsilä X72 is a low-speed marine diesel engine having a cylinder bore of 720 mm. Its power output is in the 10,800 to 28,880 kW range, and it comes in 4–8 cylinder configurations. 800 100% 93% 700 600 500 Currently available main engine (Reference) Wärtsilä 6X72 HFO price = 600 USD/tonne engine de-rating potential, lower propeller revolutions (RPM), and the utilization of a larger propeller diameter. For vessels with draught restrictions affecting the propeller diameter, a higher propeller speed can be selected using the unique Wärtsilä extended layout field (R1+). This, together with the favourable piston dismantling height, makes this engine very attractive for container vessel, bulk carrier, and oil tanker applications.

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OPERATIONAL FEATURES 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 customer requirements according...

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