INSTALLATION
US / M-SQ7 / October 2010
13
2
SUPER SILENT" EXHAUST SYSTEM
See figure 13. In order to reduce the noise level of the
generating set to a minimum, an option to reduce the
exhaust noise further (especially exhaust water splashing)
is an exhaust/water separator. The exhaust/water
separator allows the cooling water to be ejected through a
line separate from the exhaust fumes and also functions
as a goose neck to prevent water from flooding the engine.
If the exhaust/water separator is mounted more than 24”
(60 cm) above the water level an additional goose neck is
not required.
If the through-hull exhaust outlet has to be mounted far
from the generating set (total length of the exhaust piping
from generator to top of goose neck (water separator) is
more than 10 ft (3 m.)), an exhaust/water separator must
definitely be installed (see figure 14). The sea water from
the separator must then run down along the shortest
possible path to the through-hull outlet.
Only after the exhaust/water separator the exhaust hose
may have a length of over 25 ft (7.5 m) if the exhaust hose
diameter is also increased from 1
5
/
8
” (40 mm) to 2” (51
mm) in order to reduce the back pressure (ref. to fig. 14)
However watertraps should be avoided as the fumes still
contains water and this should not accumulate in bents
(refer to fig 15 and 16). An additional outlet exhaust
muffler close to the hull outlet will help further to reduce
noise emission (see figure 12, ref.2).
Figure 15: Water trap in exhaust system
Figure 16: Water will collect in the hanging bend of the exhaust gas hose and will cause back pressure.
OK!
WRONG
OK!
WRONG!
