Fuel Gas System - Wartsila ?31DF Series Product Manual

6. Fuel Oil System
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
System components
10N05
10N08
Pipe connections
108
708
726
6-10
Example of fuel gas operation with open type GVU (DAAF022750F)
01 Gas detector
02 Gas double wall system ventilation fan
Gas valve unit
LNGPAC
Gas inlet
Gas system ventilation
Air inlet to double wall gas system
Wärtsilä 31DF Product Guide
Supplier
-
-
Wärtsilä
Wärtsilä
Size
DN50/DN65
DN25 (DN50 16V)
DN25
DBAE248994