Under-cooling of the engine room should be avoided during all conditions (service conditions,
slow steaming and in port). Cold draft in the engine room should also be avoided, especially
in areas of frequent maintenance activities. For very cold conditions a pre-heater in the system
should be considered. Suitable media could be thermal oil or water/glycol to avoid the risk
for freezing. If steam is specified as heating medium for the ship, the pre-heater should be in
a secondary circuit.
Fig 10-1 Engine room ventilation, turbocharger with air filter (DAAF391752)
Fig 10-2 Engine room ventilation, air duct connected to the turbocharger
(DAAF391711)
10.2 Combustion air system design
Usually, the combustion air is taken from the engine room through a filter on the turbocharger.
This reduces the risk for too low temperatures and contamination of the combustion air. It is
important that the combustion air is free from sea water, dust, fumes, etc.
For the required amount of combustion air, see section Technical data.
The combustion air shall be supplied by separate combustion air fans, with a capacity slightly
higher than the maximum air consumption. The combustion air mass flow stated in technical
10-2 DBAE248994
Wärtsilä 31DF Product Guide10. Combustion Air System
To Next Page
Loading...
Need help?
General