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Introduction
The Vetus exhaust system components are especially suitable
for use in water-injected exhaust systems.
The maximum continuous operating temperature of the plas-
tic components of the exhaust systems is 70 degrees C (158
degrees F).
The MF and MV silencers have been developed for fast ships
with high-power engines, where there is often insufficient space
for a water-lock and/or swan's neck.
The MV type silencer is fitted with a non-return valve, this pre-
vents water entering the exhaust system from aft, caused by
reversing, stopping the ship quickly, or waves from aft.
• Fit a temperature alarm to warn of excessively hot
exhaust system temperature.
• If the quantity of injected coolant water is reduced to
in order to lower back-pressure in the exhaust system,
check that there is still sufficient water injected when
the engine is ticking-over. This will prevent excess tem-
peratures in the exhaust system.
• Excess temperature can also be the consequence of
insufficient mixing of coolant water with the exhaust
gasses.
In general, good mixing is obtained by a virtually verti-
cally installed exhaust injection bend, see drawing 1.
Poor mixing can also occur with an engine on tick-over;
especially when the coolant water injection bend is
installed virtually horizontally, see drawing 2.
If necessary, take action. For example; by fitting a water
vortex or a water splitter in the exhaust pipe, to improve
the mixing of coolant water with the exhaust gasses,
see drawing 3.
With water-injected exhaust systems, fit a hose of suitable qual-
ity.
This hose must be reinforced, resistant to exhaust gasses, high
temperatures (100 degrees C, 212 degrees F) and oil. Easy
flexibility is essential for installation, while the hose must not
collapse when heated.
Vetus exhaust hose fulfills all the above requirements.
The complete VETUS range includes the following hose diam-
eters: 30 mm (1.2"), 40 mm (1.6"), 50 mm (2"), 60 mm (2.4"),
65 mm (2.6"), 75 mm (3"), 90 mm (3.5"), 100 mm (4"), 110 mm
(4.3"), 125 mm (4.9") and 150 mm (5.9"). A minimum hose
diameter must be used in relation to the engine power:
4
030416.02
Engine power
Hose
to:
dia.:
10 kW (14 hp)
30 mm
18 kW (25 hp)
40 mm
23 kW (32 hp)
45 mm
29 kW (40 hp)
50 mm
40 kW (55 hp)
60 mm
50 kW (68 hp)
65 mm
WARNING
If water enters the engine from the exhaust silencer into
the exhaust system (for example: under sail when the ship
rolls or pitches heavily) this will lead to irreparable dam-
age to the engine.
The overall dimensions drawing shows the maximum
amount of water which can be contained in the exhaust
silencer. Too much water in the silencer can effect engine
starting; drain off this water first. Too much water in the
silencer can be also caused by repeated starting attempts
while the engine refuses to start.
Installation
Installing MV and MF exhaust silencer
Instal the exhaust silencer as horizontal as possible.
The exhaust silencer 'IN'-connection must always remain below
the level of the exhaust injection bend! Position the silencer
'back-to-front' alongside the engine when there is insufficient
space behind the engine.
During operation, the exhaust silencer will contain water. Its
weight will thus increase considerably, so fit the silencer with
the tension straps supplied.
Installing the transom exhaust connection
Fit the transom exhaust connection at such a position that with
the ship fully laden, the outlet is still at least 5 cm (2") above
the waterline.
In order to install the transom exhaust connection so that it
remains watertight, apply marine adhesive sealant between the
flange of the transom connection and the transom.
The exhaust hose on the transom exhaust connection can be
fitted without hose connector.
Engine power
Hose
to:
dia.:
65 kW (90 hp)
75 mm
95 kW (130 hp)
90 mm
118 kW (160 hp)
100 mm
142 kW (193 hp)
110 mm
184 kW (250 hp)
125 mm
265 kW (360 hp)
150 mm
Exhaust silencer MF/MV
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