Cooling system
46
Seawater inlet
Sea water enters through a scoop
À
on the
underside of the hull.
In this way, the pressure created at the sea water
inlet while the ship is moving can be utilised to
supply the pump with sea water.
Scoop
Although the inlet cross−section of the scoop is
determined by the diameter of the sea water inlet
pipe, it should nevertheless be designed to be as
large as possible within the framework of these
limits.
In order to achieve a flow−optimised shape, the
entire scoop should be manufactured as a single
casting.
The sea water enters through a grille with large
openings between the bars
Á
. In order to assist
the inflow into the sea water inlet pipe to the
engine, the back of the scoop
Â
must have a
round, flow−optimised shape so that no water
backpressure can inhibit the sea water supply.
In the case of two−part scoop designs, i.e.
separate grille
Ã
and sea water inlet line
Ä
, poor
arrangement of these two components will cause
water backpressure at the back of the scoop.
The same effect can arise in the case of one−part
scoops with rectangular grille designs.
Seawater inlet for jet drive
The water supply flow for the jet drive must not
hinder the seawater supply for the engine cooling
system.
1
3
2
5
4
Summary of Contents for V12-1800
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Page 12: ...Planning of engine installation 10 V12 1800 1 2 3 4 5 V8 1200 6 7 8 9 4 10 11...
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