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November 16, 2005

Wartsila introduces new low speed diesels

Wartsila Corporation has introduced two new low-speed marine diesel engines each of which will be available in two versions, namely the Wartsila RT-flex82C, RTA82C, RT-flex82T and RTA82T.

The two engines are designed for two different markets. The "C" versions target the containership sector and the "T" the tanker sector.

The RT-flex82C and RTA82C are intended to be ideal prime movers for the propulsion of Panamax containerships with capacities up to 4,500 TEU at a typical service speed of about 24 knots.

With cylinder dimensions of 820 mm bore and 2646 mm stroke, the RT-flex82C and RTA82C will be available with six to twelve cylinders to cover a power range of 21,720 kW to 54,240 kW at 87 to 102 rpm.

The RT-flex82T and RTA82T are designed to provide the right powers and shaft speeds for the propulsion of large tankers, VLCCs and ULCCs of 200,000 dwt to more than 350,000 dwt.

With cylinder dimensions of 820 mm bore and 3375 mm stroke, they will be built with six to nine cylinders to cover a power range of 21,720 kW to 40,680 kW at 68 to 80 rpm.

The first engines of the new types are expected to be completed towards the end of 2007, in cooperation with Hyundai Heavy Industries Co Ltd supporting Wartsila in engine production design and testing by utilizing itsexisting facilities and manpower.

The separate 'C' and 'T' versions are designed in parallel using the platform concept. Their parameters are standardized as far as possible, except principally the piston stroke, of 2646 mm for the 'C' version and 3375 mm for the 'T'. As a result, many components can be same for both versions, allowing benefits of rationalisation in the design and manufacturing, lowering manufacturing costs, and rationalizing spare parts stocks.

The layout fields of these engines, as defined by the power/speed ratings R1, R2, R3 and R4, are extended to the rating R1+ at the same power as R1 but with increased shaft speed. The extended fields offer widened flexibility to select the most efficient propeller speed for lowest daily fuel consumption, and the most economic propulsion equipment, namely the propeller, shafting, etc.

The Wartsila RT-flex82C and RT-flex82T engines incorporate common-rail technology with full electronic control of fuel injection and exhaust valve operation.

The RTA82C and RTA82T have traditional mechanically-driven camshafts with fuel injection pumps, exhaust valve actuator pumps etc. Otherwise the RT-flex and RTA versions have the same principal characteristics and design features.

The engines will meet the market needs for outstanding reliability, high efficiency, compactness, optimized industrialisation, and environmental requirements. As with all new marine engines nowadays, they will be fully compliant with the NOX emission regulation of Annex VI of the MARPOL 1973/78 convention.

The RT-flex versions have the added benefit of no visible smoke emissions at all operating speeds, together with lower running speeds.

The mechanical RTA versions will be available for those shipowners preferring the traditional concept.

Principal characteristics of Wrtsil RT-flex82C, RTA82C, RT-flex82T and RTA82T marine engines are shown in the table:

Engine type   RT-flex82C   RT-flex82T  
 RTA82C  RTA82T  
Cylinder bore:    820    820    mm
Piston stroke:    2646   3375   mm
Stroke/bore ratio:     3.2   4.1  
Power/cylinder,R1 & R1+:   4520  4520  kW
 6150     6150   bhp
Speed range, R1+ to R3/R4:   102–87  80–68  rev/min
Maximum cylinder pressure:    159  159  bar
Mean effective pressure, R1/R1+: 20.0/19.0 20.0/19.0  bar
Mean piston speed, R1/R1+: 8.6/9.0 8.6/9.0  m/s
Numbers of cylinders:  6 to 12 6 to 9
Power range:  21,720–54,240 21,720–40,680 kW
29,520–73,800 29,520–55,350 bhp
BSFC at full load, R1/R1+:   171/169 167/165  g/kWh