Wartsila 31, Product Manual

Page: 14 / 168

2.3 Operation at low load and idling
Table 2-1 Idling and low load operation restrictions
HFO, max continous
time [h]
LFO, max continous
time [h]
Load
10 15 0%
10 50 2%
200 300 17.5%
Fig 2-4 Low load operating restrictions
NOTE
Above 17.5% load there is no additional restriction from low load operation. 1)
Duration of low load only applies if charge air temp in receiver is at: 2)
- LFO: 35C or above
- HFO: 45C or above
High load running (minimum 70%) is to be followed for a minimum of 60 minutes to clean up the engine
after maximum allowed low load running time has been reached.
3)
2.4 Low air temperature
In cold conditions the following minimum inlet air temperatures apply:
●
Min 5ºC
For lower suction air temperatures engines shall be configured for arctic operation.
For further guidelines, see chapter Combustion air system design.
2-4 Wärtsilä 31 Product Guide - a1 - 18 October 2016
Wärtsilä 31 Product Guide 2. Operating Ranges