● Maximum 6 hours if the engine is to be loaded after the idling.
Operation below 20 % load
● Maximum 100 hours continuous operation. At intervals of 100 operating hours the engine
must be loaded to minimum 70 % of the rated output.
Operation above 20 % load
● No restrictions.
2.4 Low air temperature
In cold conditions the following minimum inlet air temperatures apply:
● Starting + 5ºC
● Idling - 5ºC
● High load - 10ºC
The two-stage charge air cooler is useful for heating of the charge air during prolonged low
load operation in cold conditions. Sustained operation between 0 and 40% load can however
require special provisions in cold conditions to prevent too low HT-water temperature. If
necessary, the preheating arrangement can be designed to heat the running engine (capacity
to be checked).
For further guidelines, see chapter Combustion air system design.
2-4 Wärtsilä 46F Product Guide - a19 - 1 December 2017
Wärtsilä 46F Product Guide2. Operating Ranges
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