NOTE
1) Valid for both gas operation and diesel operation.
2) Minimum engine speed is restricted to 472rpm with engine driven oil pump.
3) Additional restrictions apply to low load operation.
4) Project specific idling and clutch in speed depends on clutch, gearbox and the
Torsional Vibration Calculations.
Remarks: The maximum output may have to be reduced depending on gas properties and
gas pressure. The permissible output will in such case be reduced with same percentage at
all revolution speeds.
2.2 Loading capacity
Controlled load increase is essential for highly supercharged diesel engines, because the
turbocharger needs time to accelerate before it can deliver the required amount of air. A slower
loading ramp than the maximum capability of the engine permits a more even temperature
distribution in engine components during transients.
The engine can be loaded immediately after start, provided that the engine is pre-heated to:
● High Temperature (HT) water temperature is minimum 70°C
● Lubricating oil temperature is minimum 40°C
The ramp for normal loading applies to engines that have reached normal operating
temperature.
2-2 DBAE248994
Wärtsilä 31DF Product Guide2. Operating Ranges
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