Vetus NLP Série Instructions D'installation page 4

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 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.
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 qual-
ity.
This hose must be reinforced, resistant to exhaust gasses, high
temperatures (100 degrees C, 212 degrees F) and oil. Easy flex-
ibility is essential for installation, while the hose must not col-
lapse when heated.
Vetus exhaust hose fulfils all the above requirements.
WARNING
If water enters the engine from the waterlock 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.
Too much water in the waterlock can effect engine start-
ing; drain off this water first. Too much water in the water-
lock can be also caused by repeated starting attempts
while the engine refuses to start.
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Installation
Installing waterlock NLP
Instal the waterlock as vertical as possible.
The waterlock 'IN'-connection must always remain below the
level of the exhaust injection bend! Position the waterlock
'back-to-front' alongside the engine when there is insufficient
space behind the engine.
During operation, the waterlock will contain water. Its weight will
thus increase considerably, so fit the waterlock with the ty-raps
supplied. The waterlock has slots in which the ty-raps
be fitted.
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.
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 downward over its whole length from the water injection
point to the waterlock.
During operation, the exhaust pipe will contain water. This will
increase its weight considerably, so support the exhaust pipe
properly.
The exhaust pipe from waterlock 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 waterlock.
- The length of the section between the waterlock and the
highest point, should not exceed 300 cm (120").
®
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Waterlock NLP