Hose Connections - Vetus NLPH Serie Instrucciones De Instalación

1 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).
• Fit a temperature alarm to warn of excessively hot ex-
haust 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 in-
sufficient mixing of coolant water with the exhaust gas-
ses.
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 in-
stalled 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 flex-
ibility is essential for installation, while the hose must not col-
lapse when heated.
Vetus exhaust hose fulfils all the above requirements.
If water enters the engine from the waterlock into the ex-
haust 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 waterlock can effect engine starting;
drain off this water first. Too much water in the waterlock
can be also caused by repeated starting attempts while the
engine refuses to start.
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W
arning
2 Installation
2.1 Installing waterlock NLPH
Instal the waterlock as horizontal 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.
2.2

Hose connections

In order to achieve the ideal connection between the hoses and the water-
lock, both hose connections turn through 360 degrees.
NLPH40
NLPH45
NLPH50
NLPH60
NLPH75
NLPH90
Loosen the bolts before turning the hose connections!
Tighten the hose connections to a torque of 1 Nm (0.74 ft-lb, 142 oz-in).
The 2 halves of the housing can also be turned relative to each other.
max. 2 x 30°
OUT
max. 2 x 30°
OUT
For a proper working it is essential that the OUT half of the housing and
the inner part placed within this are in the relative positions as shown in
the illustration. A deviation of maximum 30˚ to either side is permitted.
The IN half of the housing may be placed in any position.
Make sure that IN and OUT are not interchanged with each other
while fitting!
360°
IN
360°
IN
n
ote
Waterlock NLPH