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Westerbeke WPDS-20 Manual del operador Pagina 9

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Exhaust
System
The exhaust system provides an outlet line
to
vent engine exhaust gases out of and away from the vessel.
The system also discharges sea water which has passed through the engine's sea water circuit by mixing it
with hot exhaust gases. This mixing helps cool the exhaust gases and exhaust elbow and plumbing. The ex-
haust system and the sea water supply
to
the exhaust must be configured
to
prevent the siphoning of sea
water into the exhaust through the sea water cooling circuit and
to
prevent the entry
of
sea water into the ex-
haust through the
circutt's through-hull discharge port. If not prevented, sea water entering through the dis-
charge port can
fill the exhaust system muffler and enter the engine's cylinders. This will prevent proper
starting and possibly cause damage
to
internal engine components.
The sea water supply hose
to
the exhaust system water injection elbow should be routed (looped) at least
12
inches above the vessel water line. An anti-siphon break should be installed, when needed, at the top of
this loop. The
top
of
the
loop
should be placed high enough above the vessel's water line so as to remain
above the water
line when the vessel
is
underway,
no
matter what the angle
of
heel
or
roll may be.
74"
or
1
It
LD.
hose
Installation
with
exhaust
manifold/water-injected
elbow
at
a
minimum
of
6"
above
vessel
water
line.
Waterline!\.....
-~-~,
'-"-~.~~:-.~
Insulate -
-.
installation with
exhaust
manifoldiwater.injected
elbow
at
or
below
vessel
water
line.
NOTE:
The
engine's
heat
exchanger
outlet will
determme
the
Ik
ff
or
1 "
dimenSion
lor
the vented loop.
HydrO-Hush
48" mal(,
Hydro-Hush
48"
max.
!
~J
CAUTION: Vented loop
must
be
in a location
where
it will remain
above the
water
line
during
all
aHitudes of the
vessel's
operation.
The sea water supply through-hull sea
cock
fittings
must
be of the flush-hull type. High-speed scoop type
of
fittings should not be used as they tend
to
encourage siphoning.
The exhaust discharge from the water
lift muffler should be routed well above the water line then downward
to
the through-hull discharge. This routing will prevent sea water entry if the through-hull discharge fitting
becomes submerged when the vessel heels
or
rolls while under way,
or
is
subjected
to
following sea condi-
tions. Refer
to
the figures shown above for recommended exhaust system installations.
15
Westerbeke Diesel
Engines
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