NOTE1) 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 theTorsional Vibration Calculations.Remarks: The maximum output may have to be reduced depending on gas properties andgas pressure. The permissible output will in such case be reduced with same percentage atall revolution speeds.2.2 Loading capacityControlled load increase is essential for highly supercharged diesel engines, because theturbocharger needs time to accelerate before it can deliver the required amount of air. A slowerloading ramp than the maximum capability of the engine permits a more even temperaturedistribution 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°CThe ramp for normal loading applies to engines that have reached normal operatingtemperature.2-2 DBAE248994Wärtsilä 31DF Product Guide2. Operating Ranges
