Vetus DEMPMP Mode D'emploi page 4

1 Introduction
The Vetus exhaust system components are especially suitable for use
in water-injected exhaust systems.
The maximum continuous operating temperature of the plastic
components of the exhaust systems is 70 degrees C (158 degrees F).
• 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 temperatures in the
exhaust system.
• Excess temperature can also be the consequence of insuf-
ficient mixing of coolant water with the exhaust gasses.
In general, good mixing is obtained by a virtually vertically
installed exhaust injection bend.
Poor mixing can also occur with an engine on tick-
over; especially when the coolant water injection bend is
installed virtually horizontally.
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.
With water-injected exhaust systems, fit a hose of suitable quality.
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 fulfils all the above requirements.
The complete VETUS range includes the following hose diameters:
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 rela-
tion to the engine power:
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
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030413.03
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
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 damage to the
engine.
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.
2 Installation
Installing silencer DEMPMP
The silencer can be fitted in front of, or after the goose neck. Fitting
after the goose neck gives less of a gurgling exhaust sound.
During operation, the silencer contains water. This means that the
weight increases considerably and the silencer requires additional
support.
The silencers with a hose connector diameter between ø 40 and ø 90
mm are fitted with two handles to secure them.
The silencers with a hose connector diameter of ø 100 mm can be
secured using the two Ty-rap®'s supplied.
N.B: There is no DEMPMP silencer available for 30 mm (1.2") diameter
exhaust systems.
Exhaust pipe
In order to ensure the proper drainage of the coolant water injected
into the exhaust pipe, the pipe must be installed with a slope down-
ward over its whole length from the water injection point to the
exhaust silencer.
During operation, the exhaust pipe will contain water. This will
increase its weight considerably, so support the exhaust pipe prop-
erly.
The exhaust pipe from silencer to transom connection must be
installed in such a way that:
- The highest point in the exhaust pipe should not be more than
150 cm (60") above the underside of the exhaust silencer.
- The length of the section between the exhaust silencer and the
highest point, should not exceed 300 cm (120").
Hose connections
To ease the fitting of the hose to the hose connector, use only water
and/or soap, NOT grease or products containing oil.
Fit each hose connection with 2 stainless steel 12 mm (0.5") wide
hose clamps.
W
arning
Silencer DEMPMP