Marine Installation Manual
2021-08
1-1
1 Engine Summary
1.1 Engine capability and features
X72DF
1
Engine Summary
The WinGD X72DF is a camshaftless, low-speed, reversible and rigidly direct-
coupled two-stroke engine featuring a common-rail injection system.
Table 1
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1
X72DF summary values for Maximum Continuous Rating (MCR)
This chapter introduces the engine. It focuses on all aspects of the engine that
may be different from other engines. This chapter also highlights the suitability
of the engine.
1.1
Engine capability and features
This engine type is designed to run on fuel gas or on liquid fuel. The fuel gas is
evaporated Liquefied Natural Gas (LNG). The liquid fuel comprises a wide
range of marine fuels such as Marine Gas Oil (MGO) and Heavy Fuel Oil (HFO)
of varying qualities. This fuel flexibility is made possible by WinGD’s low-pres
-
sure technology. The operating mode can be changed while the engine is running
without any loss of power.
Certified Tier III:
Gas mode
In gas mode the main fuel is natural gas. The natural gas is injected into the en
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gine at low pressure. The gas fuel is ignited by injecting pilot fuel. The amount of
injected pilot fuel is less than 1 % of the total energy consumption of the engine.
Gas injection is hydraulically actuated and electronically controlled. Inde
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pendent micro-injectors and the pilot fuel system inject the pilot fuel. The pilot
fuel can be Marine Diesel Oil (MDO) or MGO.
Certified Tier II:
Diesel mode
The main fuel injectors inject the main fuel (HFO, MDO or MGO) in diesel
mode. To prevent clogging of the nozzles, the pilot fuel micro-injectors remain in
operation at a reduced injection rate which is approximately 0.5 % of the total
fuel consumption of the engine. The X-DF engine operates in diesel mode with
either residual marine fuel (HFO) or with marine distillate fuel (MDO or MGO)
which must be in accordance with the ISO 8217:2017 specification. The HFO
can have a maximum viscosity of 700 cSt. The MDO comprises either DMB or
DFB, while the MGO comprises either DMA, DFA, DMZ or DFZ, according to
the category definitions in the ISO 8217:2017 specification.
Control system
The WinGD Engine Control System (ECS) manages the key engine functions
such as gas admission, exhaust valve drives, engine starting and cylinder lubrica
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tion. The engine control system also ensures control of the fuel injection.
Bore:
Stroke:
Number of cylinders:
720mm
3,086mm
5 to 8
Power (MCR):
Speed (MCR):
Mean effective pressure:
Stroke/bore ratio:
3,225kW/cyl
89rpm
17.3bar
4.29
