Vetus DEMPMP Serie Manuel D'installation 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 com-
ponents 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 or-
der to lower back-pressure in the exhaust system, check that
there is still sufficient water injected when the engine is tick-
ing-over. This will prevent excess temperatures in the exhaust
system.
- Excess temperature can also be the consequence of insuffi-
cient 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; espe-
cially when the coolant water injection bend is installed virtu-
ally horizontally.
If necessary, take action. For example; by fitting a water vor-
tex or a water splitter in the exhaust pipe, to improve the mix-
ing 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 tem-
peratures (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.
Engine power to * :
18 kW (24,5 hp)
22 kW (30 hp)
28 kW (38 hp)
39 kW (53 hp)
63 kW (86 hp)
89 kW (121 hp)
114 kW (155 hp)
* Based on an allowed back pressure of 0.1 bar.
If water enters the engine from the exhaust silencer into the ex-
haust system (for example: under sail when the ship rolls or pitch-
es 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.
4
030413.03
Hose dia.:
ø 40 mm (1 9/16")
ø 45 mm (1 3/4")
ø 51 mm (2")
ø 60 mm (2 3/8")
ø 76 mm (3")
ø 90 mm (3 1/2")
ø 102 mm (4")
W
arning
2 Installation
2.1 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.
2.2 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 ex-
haust silencer.
During operation, the exhaust pipe will contain water. This will in-
crease its weight considerably, so support the exhaust pipe properly.
The exhaust pipe from silencer to transom connection must be in-
stalled 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").
2.3 Hose connections
- To ease the fitting of the hose to the hose connector, use only wa-
ter and/or soap, NOT grease or products containing oil.
- Fit each hose connection with 2 stainless steel 12 mm (0.5") wide
hose clamps.
Silencer DEMPMP