wartsila-o-e-w-20df
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WÄRTSILÄ 20DF
THE KEY BENEFITS OF THE WÄRTSILÄ 20DF ARE: • Fuel flexibility
• Application flexibility
• Proven and reliable Dual Fuel technology
• Long overhaul intervals
• Low exhaust gas emissions
• Low gas feed pressure
• Embedded automation system WÄRTSILÄ DF based engine room layout.
The WÄRTSILÄ® 20DF is a fourstroke Dual
Fuel engine that can be run on natural gas,
marine diesel oil (MDO) or heavy fuel oil
(HFO). The engine can switch over from gas
to MDO/HFO and vice versa smoothly during
engine operation without power interruption.
The WÄRTSILÄ 20DF design is based on the
well proven and reliable WÄRTSILÄ 20 diesel
engine which was introduced on the market in
the early 1990s. WÄRTSILÄ 20DF completes
the lower power range in the Dual Fuel
WÄRTSILÄ engine family.
APPLICATION FLEXIBILITY WÄRTSILÄ 20DF is suitable for a wide range
of applications. Thanks to fuel flexibility the
engine can be installed and optimised for
constant speed generating sets as well as
variable speed mechanical drives for main
engine applications.
The multifuel operation capability offers
new machinery opportunities for various
vessel applications. The WÄRTSILÄ 20DF
can be installed to complete the multifuel
engine room concept as generating set next
to WÄRTSILÄ 34DF or WÄRTSILÄ 50DF main
propulsion machinery. Typical installation
examples are RoPax or LNG carriers. The
compact and light WÄRTSILÄ 20DF fits
perfectly also as mechanical drive prime
mover for smaller applications, such as small
cargo vessels, ferries or tug boat installations.
WÄRTSILÄ 20DF is also optimal for
harbour genset application for a wide range of
vessel types.
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Main dataCylinder bore .................................. 200 mmPiston stroke................................... 280 mmCylinder output.......................... 200 kW/cylSpeed ...........................................1000 rpmMean effective pressure .................28.0 barPiston speed.................................... 9.3 m/s
Fuel specification:Fuel oil .................................... 730 cSt/50 °C
7200 sR1/100 °FISO 8217, category ISO-F-RMK 700
SFOC 186–192 g/kWhat ISO condition
Option: Common rail fuel injection.
Rated power
Engine type kW
4L20
6L20
8L20
9L20
800
1 200
1 600
1 800
Dimensions (mm) and weights (tonnes)
Engine type A* A B* B C* C D F Weight
4L20
6L20
8L20
9L20
–
3 254
3 973
4 261
2 510
3 108
3 783
4 076
–
1 528
1 614
1 614
1 348
1 348
1 465
1 449
–
1 580
1 756
1 756
1 483
1 579
1 713
1 713
1 800
1 800
1 800
1 800
725
624
624
624
7.2
9.3
11.0
11.6
*Turbocharger at flywheel end.For definitions see page 71.
WÄRTSILÄ 20 IMO Tier II
88
Main dataCylinder bore .................................. 200 mmPiston stroke................................... 280 mmCylinder output.................. 185, 200 kW/cylEngine speed........................ 900–1000 rpmMean effective pressure ........24.6, 28.0 barPiston speed............................. 6.7, 9.3 m/sGenerator voltage..................... 0.4–13.8 kVGenerator efficiency .................... 0.95–0.96
Fuel oil specification:730 cSt/50°C7200 sR1/100°FISO 8217, category ISO-F-RMK 700SFOC 185–194 g/kWhat ISO condition
Option: Common rail fuel injection.
Rated power 60 Hz 60 Hz 50 Hz
Engine type185 kW/cyl, 900 rpm 200 kW/cyl, 1000 rpm
Eng. kW Gen. kW Eng. kW Gen. kW
4L206L208L209L20
7401 1101 4801 665
7001 0551 4051 580
8001 2001 6001 800
7601 1401 5201 710
Generator output based on a generator efficiency of 95%.
Dimensions (mm) and weights (tonnes)Engine type A* E* I* K L* Weight*
4L206L208L209L20
4 9105 3256 0306 535
1 770/1 9201 770/1 920/2 070
1 920/2 0702 070/2 300
990895/975/1 025
1 025/1 0751 075/1 125
1 8001 8001 8001 800
2 3382 243/2 323/2 373
2 474/2 5242 524/2 574
14.016.820.723.8
* Dependent on generator type and size. For definitions see page 93.
WÄRTSILÄ GENSET 20 IMO Tier II
TECHNOLOGY AND OPERATION ADVANTAGES One of the main features of the proven
Dual Fuel technology is that the engine can
be switched from fuel oil to gas operation.
Transfer takes place automatically after
the operator’s command without power
interruption or instantly in case of a gas
supply interruption. Furthermore, the separate
liquid fuel system makes it possible to
switch over from MDO to HFO without power
interruption. The fuel switch from liquid to gas
operation mode can be made as described
above. This operation flexibility is a real
advantage with the Dual Fuel system.
The natural gas is supplied to the engine
through a gas valve unit, where the gas is
filtered and gas pressure is controlled. The
system includes the necessary shutoff and
venting valves to ensure safe and troublefree
low pressure gas supply. On the engine, the
gas is supplied through a large commonrail
pipe running along the engine. Each cylinder
then has an individual feed pipe to the gas
admission valve on the cylinder head. Gas
piping is of double wall design as standard.
When running the engine in gas mode,
the air / gas mixture is ignited with a small
quantity of MDO pilot fuel, less than 1% of
fullload fuel consumption. The amount of pilot
fuel is optimised for best combustion by the
embedded engine speed & load control and
monitoring system.
The advanced automation system provides
complete engine safety system and local
monitoring. Thanks to builton complete
automation integration the external control
system is significantly reduced which obviously
saves space in the engine control room.
ENVIRONMENTAL COMPLIANCE The Dual Fuel technology brings outstanding
benefits to ship owners and operators. The
Wärtsilä 20DF operates on the lean burn
principle: the mixture of air and gas in the
cylinder contains more air than is needed
for complete combustion. Lean combustion
reduces peak temperatures and therefore NOX
emissions. In gas mode, the engine is already
compliant with IMO Tier III regulations without
any secondary exhaust gas purification
systems. Dual Fuel technology offers reduced
WÄRTSILÄ GENSET W20DF IMO Tier II
Rated power
60 Hz 50 Hz
Engine type 176, kW/cyl, 1 200 rpm 146 kW/cyl, 1 000 rpm
Engine kW Alternator kW* Engine kW Alternator kW*
6L20DF 1 056 1 014 876 841
8L20DF 1 408 1 352 1 168 1 121
9L20DF 1 584 1 521 1 314 1 261
* Assumed alternator efficiency 96%
Dimensions (mm), Weights (tonnes)
Engine type A* E I* K L* Weight*
6L20DF 5 325 2 070 900/980/1 030 1 800 2 688 17
8L20DF 6 030 2 070 1 030/1 080 1 800 2 824 20,9
9L20DF 6 535 2 300 1 080/1 130 1 800 2 874 24
Dimensions (mm), Weights (tonnes) engine
Engine type A* A B F C D Weight*
6L20DF 3 254 3 108 1 698 624 1 829 1 800 9,5
8L20DF 3 973 3 783 1 815 624 1 963 1 800 11,2
9L20DF 4 261 4 076 1 799 624 1 963 1 800 11,8
WÄRTSILÄ GENSET W20DF IMO Tier IIMain data: Cylinder bore .................................. 200 mm Piston stroke .................................. 280 mm Cylinder output ................... 146/176 kW/cyl Engine speed..................... 1 000/1 200 rpm Mean effictive pressure .................. 20.0 bar Piston speed ........................... 9.3/11.2 m/s Generator voltage ...................... 0.413.8 kV Generator efficiency ..................... 0.950.96
Fuel oil specification: ISOFDMX, DMA and DMB ISO 8217:2005(E)
SFOC 194/199 g/kWh at ISO conditions Without engine driven pumps Tolerance 5 %
* Preliminary: depends on generator type
SOX and CO 2emissions as well as smokeless
operation in gas operation mode.
In liquid fuel oil mode, the WÄRTSILÄ 20DF
engine is fully compliant with the IMO Tier
II exhaust emissions regulations set out in
Annex VI of the MARPOL 73/78 convention.
WÄRTSILÄ® is a registered trademark. Copyright © 2009 Wärtsilä Corporation. Boc
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