FINLAND
engine with a maximum continuous power of 9720kW at 124rev/min, together with a Wärtsilä FP propeller and three 645kWe Auxpac generating sets.
These are the first Diamond 53 ships to be equipped with RT-flex50 common-rail engines, which are the latest addition to Wärtsilä's series of electronically-controlled common-rail RT- flex engines for ship propulsion. The RT-flex50 engine has a power range from 5800kW to 13,280kW.
The first two RT-flex50 engines successfully completed their official shop tests last summer. In November, the first RTflex-50 engine was delivered to China. Built under licence in Japan, it was installed on Rederi AB Donsötank's 19,500dwt geared bulk carrier Credo recently completed by Shanghai Edward Shipbuilding. The six-cylinder model has a MCR output of 9720kW at 124rev/min, and it directly drives a 5.5m diameter Lips CP propeller.
This ship also has a 2000kW shaft-driven alternator, but - unusually - no frequency cyclo- converter; for this reason, the alternator will only be used when constant shaft revolutions are available. This interesting vessel, intended for Baltic operation, is strengthened to ice class 1A Super.
Advances in China The first Chinese-built RT-flex50 engines, seven-cylinder models from Dalian Marine Diesel Works, are intended for two ice class 1A Super 52,000dwt product tankers ordered by Rederi AB Gotland from Guangzhou Shipyard International. Also for these two vessels, four Wärtsilä 20 Auxpac diesel alternators, Lips CP propellers, and bow thrusters will be delivered from
Wärtsilä's newly opened thruster
production plant in Wuxi. Only recently, Wärtsilä opened a joint venture propeller manufacturing plant in China, at Zhenjiang, and is currently finalising a plant in Shanghai for building auxiliary generating sets in a joint venture with Shanghai Marine Diesel Engine Research Institute. In addition, Wärtsilä is setting up a factory for producing reduction gears in India. Meanwhile, Wärtsilä continues supplying its new 46F large-bore medium-speed engines. Among among recent orders were a pair of engines for a 1700TEU open-top container feeder vessel for Dutch Wagenborg Shipping, to be built at IHC Holland (Kinderdijk shipyard) in The Netherlands. The 46F engine, launched in autumn 2004, comes in six-, seven- , eight- and nine-cylinder in-line configurations, and covers a power range of 7500kW to 11,250kW at 600rev/min. It has an output of 1250kW/cylinder; thus fewer cylinders are needed for a given output, resulting in a more compact design and reduced maintenance. The Wärtsilä 46F has common- rail fuel injection as standard.
Auxpac success Last year, Wärtsilä was also successful in winning orders for its new Auxpac generating sets, introduced in 2004. These are factory- assembled, pre-commissioned standard sets of modular design, launched to overcome various problems that sometimes arise with third-party
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Two 52,000dwt ice-class (1A Super) tankers for Rederi AB Gotland are being built at Guangzhou Shipyard International. These will be powered by the first Chinese-built RT-flex50 engines - seven- cylinder models from Dalian Marine Diesel Works. They will drive CP propellers.
packagers. Typical applications include general cargo and container vessels, tankers, and VLCCs.
Auxpac generating sets are supplied in medium-speed and high-speed configurations with outputs ranging from 60kW to 2850kWe for either 50Hz or 60Hz operation. The first two generating sets were delivered in April 2005, and at the time of writing, more than 200 sets were on order, 70 of which are destined for China.
Wärtsilä supports the project management and installation of these sets, and provides all necessary documentation, which is said to be easy to use. Service and spare parts can also be supplied.
Dual-fuel engine update
Production of dual-fuel marine engines continues. Currently, Wärtsilä is supplying a total of 13 LNG carrier newbuildings with dual-fuel type engines. Last year, Wärtsilä received a major order for 24 50DF dual-fuel engines from Samsung Heavy Industries, to power a series of six 155,000m3
dual-fuel- electric LNG carriers - four for AP Möller and
two for K-Line, of Japan. Each ship will be equipped with one six-cylinder and three 12- cylinder engines, delivering a total power of 39.9MW.
Delivery of the first of this series is scheduled to begin early in 2008. Fifty-two Wärtsilä 50DF dual-fuel engines have so far been ordered for application in 13 dual-fuel-electric LNG carriers. In addition to Samsung, dual-fuel LNG carrier engines have been ordered by Alstom Marine (Chantiers de l'Atlantique) and Hyundai Heavy Industries. According to Wärtsilä, dual-fuel-electric machinery concept for LNG carriers offers a very significant improvement compared with traditional steam turbines in terms of operating economy, exhaust gas emissions, and redundancy. At the same time, it maintains aspects such as safety, reliability, and maintainability at an appropriate level. Crewing of dual-fuel-electric LNG carriers should not be problematic either. Wärtsilä dual-fuel engines have also been selected for FPSOs, dual-fuel- electric offshore supply vessels, as well as onshore power plants.
THE NAVALARCHITECT FEBRUARY 2006
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