Designed with vessel efficiency and environmental friendliness in mind
EEDI regulations, low vessel emissions, and operational flexibility have been key considerations in designing the X72-B as the preferred engine for new merchant vessels. The new engine offers high levels of propulsion efficiency resulting from its lower engine revolutions. The wide rating field presents increased flexibility for selecting the most efficient propeller speed, thus giving minimised daily fuel consumption, by using the appropriate propeller diameter for the projected ship design and mission profile. For vessels with draught restrictions affecting the propeller diameter, a higher propeller speed can be selected. This, together with the favourable piston dismantling height, makes this engine very attractive for Suezmax tankers, Capesize bulk carriers, as well as Panamax and Sub-Panamax container vessels.
This low-speed marine diesel engine with 720mm cylinder bore is available in 5- up to 8-cylinder configuration, covering a power range from 10,600 to 31,360kW at 66 to 89rpm.
WinGD’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. This flexibility results in lower fuel consumption across the entire operating range, especially at low and part loads. In addition, different engine tunings (Standard, Delta, Delta By-Pass and Low Load) are available in order to meet specific customer requirements. Intelligent Combustion Control (ICC) system enables further fuel savings and balanced working of each cylinder.
The engine is fully compliant with IMO Tier III NOx emission levels when equipped with a SCR catalyst system. The introduction of the EEDI index also puts an emphasis on CO2 emissions and total vessel efficiency. The X72’s internal engine and propulsion efficiencies, and the possibility to apply various Power Take-Off (PTO) arrangements for on-board electricity production, makes it easier for shipyards to meet these new requirements. Waste Heat Recovery (WHR) offers further possibilities for maximising energy efficiency and for reducing emissions.
TOTAL COST OF OWNERSHIP
All areas of lifecycle costs have been taken into account for the X72-B. The selected stroke-to-bore ratio makes the engine compact and has a positive impact on the manufacturing and component cost. The X72-B 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. Together with Condition Based Maintenance (CBM) and service agreements, the overhaul interval could be even further extended, thus minimising maintenance costs and maximising the revenue-earning capability of the vessel.
All Generation X engines can be converted to use LNG as fuel. For simplifying the future conversion WinGD has introduced the DF-ready version as an option. The DF-ready engines can be easily converted to dual-fuel, as no major structural components need to be modified. All parts, which are to be replaced at a later conversion, are either typical wear parts or specific X-DF components and systems. DF-ready version is the recommended solution for LNG-ready ships.
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