6.2.1 Gas mode operation
In gas operating mode the main fuel is natural gas which is injected into the engine at a low
pressure. The gas is ignited by injecting a small amount of pilot diesel fuel (MDF). Gas and
pilot fuel injection are solenoid operated and electronically controlled common rail systems.
6.2.2 Diesel mode operation
In diesel operating mode the engine operates only on liquid fuel oil. MDF or HFO is used as
fuel with a common rail system / Electronic fuel injection rate optimized nozzle system. Pilot
fuel injection is active in order to avoid clogging of pilot nozzle.
6.3 Fuel gas system
6.3.1 External fuel gas system
6.3.1.1 Fuel gas system, with open type GVU
Fig 6-1 Example of fuel gas operation with open type GVU (DAAF022750F)
SupplierSystem components
-Gas detector01
-Gas double wall system ventilation fan02
WärtsiläGas valve unit10N05
WärtsiläLNGPAC10N08
SizePipe connections
DN50/DN65Gas inlet108
DN25 (DN50 16V)Gas system ventilation708
DN25Air inlet to double wall gas system726
6-10 DBAE248994
Wärtsilä 31DF Product Guide6. Fuel Oil System
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