WinGD X72DF, Installation Manual

Page: 172 / 237

Marine Installation Manual 2021-08 4-97
4 Ancillary Systems
4.10 Engine room ventilation
X72DF
4.10.3 Air intake quality
Air intake quality can vary depending on the circumstances of the vessel. For ex -
ample, suction air is expected to have a dust content of 0.5mg/m
3
or higher if a
vessel is carrying dusty or dust creating cargoes, such as iron ore and bauxite, or
if it is often in port, trading in coastal waters and desert areas. In these cases, the
air must be filtered before it enters the engine (see
Table 4 - 15 ).
Dust filters The necessity for installing a dust filter and the choice of filter type depends
mainly on the concentration and composition of dust in the suction air. The
normal air filters fitted as standard to the turbochargers are intended mainly as si
-
lencers but not to protect the engine against dust. If the air supply to machinery
spaces has a dust content exceeding 0.5 mg/m
3
, there is a risk of increased wear
to the piston rings and cylinder liners.
Table 4 - 15 Guidance for air filtration
All filters’ surfaces must be sized correctly to ensure full functionality of the fil -
tration. This is dependent on the engine’s maximum power output as is seen
below in
Figure 4 - 54,  4-98 .
NOTE WinGD advises to install a filtration unit on vessels regularly trans -
porting dust creating cargoes, or trading in areas of atmospheric dust.
Dust concentration in ambient air
Normal Normal shipboard requirement Alternatives necessary in very special circumstances
Most frequent
particle sizes
Short period < 5% of running time,
< 0.5mg/m
3
Frequently to permanently
≥ 0.5mg/m
3
Permanently > 0.5mg/m
3
> 5 μm Standard TC filter sufficient
Oil wetted or
roller screen filter
Inertial separator and
oil wetted filter
< 5 μm Standard TC filter sufficient
Oil wetted or
panel filter
Inertial separator and
oil wetted filter
---
Normal requirement for the vast
majority of installations
These alternatives apply most likely to only very few extreme
cases, e.g. ships carrying bauxite or similar dusty cargoes, or
ships routinely trading along desert coasts.