Iveco Marine Diesel Engines, Руководство по установке

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Engines mounted on flexible supports take special flexible pipes to allow movement between the
engines and exhaust installation.
In both cases, follow the recommendations below:
■
The exhaust pipes placed after the flexible elements must be fastened with braces to the vessel
structure not to lay their weight onto the engine and to avoid shaking and vibrations that may cause
breakings with time.
■
In the case of upward motion discharge, taken into account drainage and condensed material col-
lection fitting, installed near the engine and at the bottom of the pipe to make sure that water or
rain do not enter the engine.
■
Avoid the mixture of gases coming from other engines in one exhaustion pipe system. Provide a
separate discharge outlets for each engine and avoid multiple engine exhaust gases into a single
exhaust system.
■
Pipes that go through bulkheads must be insulated to avoid noise or heat transmission.
■
It is advisable to construct exhaust pipes with anticorrosion material such as stainless steel, scour-
ing weldings properly.
■
Guaranty accurate tightness of gas pipes to avoid hazardous gas leaking into the vessel com-
partments.
9.3 MIXED DISCHARGE
Gases are mixed with the water of the secondary cooling circuit when they exit the engine. This sys-
tem is only adopted for engines supplied with water/water heat exchanger. Generally, it cannot be used
in keel cooling systems.
The two main systems depend on the engine position in the hull in relation to the waterline, and they
are the following:
■
Engine with exhaustion gas outlet above the water line
■
Engine with exhaustion gas outlet below the water line
Engine with exhaustion gas outlet flange above the water line
When planning, take into account that the mixer bottom edge is at a minimum elevation of 300 mm
over the waterline.
The pipes placed after the mixer must be resistant to exhaust gases and certified by vessel certifying
Entities.
IVECO mixer configuration may not be suitable for all kinds of vessels.
The dockyard personnel have to devise an exhaust system in such a way to avoid the return of water
to the exhaust manifold or to the engine turbine under any working conditions.They should also install
an appropriate mixer to properly exhaust gases, paying special attention not to overload the manifold
or the turbine.
Perfect gas and water tightness must be guaranteed.
Engine with exhaustion gas outlet flange below the water line
For this type of installation the system may require:
a) The construction of a special raiser to meet the conditions stated in the previous item.
b) The use of an exhaust system compatible with the room available on the engine (fig. 2).
The inverted U-tube and the air vent made at the dockyard hinder water transfer from the cooling cir-
cuit to the engine when the vessel is stopped.
MARCH 2004 DISCHARGE
9.94
MARINE ENGINES INSTALLATION