NOTE
1) In case instant load steps are applied on top of Successive loading (ramp), the
minimum time between load steps is 45 s and the maximum load application rate
between steps is 10% / 60 s. However the maximum loading limit may not be
exceeded.
2) For exceptional situations which require fast unloading (e.g. propulsion crash
stop manoeuvring) it is recommended that the engine control system be configured
for automatic transfer to diesel-mode for fastest possible unloading.
Note that the recovery time is longer than the normal class requirement (5 s). The
steady-state frequency band in gas mode also exceeds the normal class
requirement (1.0 %).
2.3 Operation at low load and idling
Absolute idling (declutched main engine, disconnected generator):
● Maximum 10 minutes if the engine is to be stopped after the idling. 3-5 minutes idling
before stop is recommended.
● Maximum 8 hours if the engine is to be loaded after the idling.
● After a gas start it is recommended to synchronize and load the engine within 1 minute
after nominal speed is reached.
Operation below 20 % load on HFO or below 10 % load on MDF or gas:
● Maximum 100 hours continuous operation. At intervals of 100 operating hours the engine
must be loaded to min. 70% of the rated output for 1 hour.
● If operated longer than 30h in liquid fuel mode, the engine must be loaded to minimum
70% of rated output for 1 hour before transfer to gas.
● Before operating below 10% in gas mode the engine must run above 10% load for at least
10 minutes. It is however acceptable to change to gas mode directly after the engine has
reached nominal speed after the engine has started, provided that the charge air temperature
is above 55°C.
Operation above 20 % load on HFO or above 10 % load on MDF or gas:
● No restrictions.
Operation at low load and idling with SCR (NOR)
LFO/MGO
●
Idling Max continuous operation time: 2h; Requirements before further operation at low
load can be continues: above 25% load for 1 h
●
Below 10%MCR Max continuous operation time: 6h; Requirements before further operation
at low load can be continues: above 70% load for 1 h or above 50% load for 2 h
●
Below 25%MCR Max continuous operation time: 24h; Requirements before further
operation at low load can be continues: above 70% load for 1 h or above 50% load for 2
h
Gas (MN≥=70)
●
Idling Max continuous operation time: 5 min; Requirements before further operation at low
load can be continues: above 20% load for 30 min or change to back-up fuel (trip to diesel
is also included as an automatic back-up feature)
●
Below 5% MCR Max continuous operation time: 10 min; Requirements before further
operation at low load can be continues: above 20% load for 30 min or change to back-up
fuel (trip to diesel is also included as an automatic back-up feature)
2-6 DBAD209883
Wärtsilä 46DF Product Guide2. Operating Ranges
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