Section
6.
Exhaust
System
GENERAL
The installation of
two
water-cooled exhaust systems are
covered in this section. They are below-load waterline
and above-load waterline, and are covered under separ-
ate headings.
All
exhaust systems for water-cooled
marine installations must meet each of the following
requirements. Failure to meet these requirements could
result in severe property damage, personal injury or
death.
b
The entire exhaust system must be accessible
so
a
periodic visual and audible check for leakage can be
made by the operator.
0
The exhaust system must be water cooled, and the
water injected as near to the generator set as
possible.
0
All
exhaust system sections preceding the point of
water injection must be water jacketed or effectively
insulated or shielded.
0
The exhaust line must be installed to prevent back
flow of water to the engine under any conditions; and
the exhaust outlet must be above the load waterline.
Water backflow into the engine will damage
it
The generator set exhaust system
must
not
be com-
bined with the exhaust system of another
engine.
0
A
flexible section of marine exhaust hose must be
used near the engine to allow for engine movement
and vibration during operation.
All
exhaust system
hoses must be CERTIFIED for marine use.
0
The exhaust system must be of sufficient size to pre-
vent excessive back pressure. See Back Pressure
data in this section.
Install exhaust through hull fitting aft of sink, shower
or other cabin drains to prevent backflow of exhaust
gases into the vessel.
Material
Use material recommended by ABYC in
“Safety
Standard
for
Small
Crafi,
”Section P1. The exhaust line must be at
least as large as the engine exhaust manifold outlet
See
following section on Back Pressure.
Exhaust gas contains carbon monox-
ide, an odorless, colorless, highly
poisonous gas that presents the hazard of severe
per-
sonal injuw
or
death. Place special emphasis on the
following:
0
Be
sure
the flexible exhaust hose
is
designed and
certified
for
marine exhaust line use.
Use
two
clamps at each end
of
all flexible exhaust
hose connections.
Do
not make shatp bends in the exhaust hose.
0
Position exhaust outlet
to
prevent backflow of
Use flexible hose designed and CERTIFIED for marine
exhaust line use. The muffler must be at the lowest point
of the entire exhaust system. The muffler top should be at
least 12 inches
(305
mm) below the exhaust manifold
outlet If it is higher, backflow of water toward the manifold
is more likely.
Make sure the hose drains toward the muffler at
a
grade
of
1
/2
inch per lineal foot
(42
mm/m). An uphill section
between the exhaust manifold and muffler can cause
backflow of water and is not permissible
-
NO
EXCEPTIONS.
exhaust gases info the vessel.
Be
sure that the vertical rise
of
the exhaust hose mea-
sured fromthe bottom of the muffler to its peak is not more
than
48
inches (1.2
m)
as shown in Figure 6-1.
The exhaust tubing (on both above and below load water-
line installations) must be pitched downward to the
through-hull outletfitting ata minimum downgrade of 112
inch per lineal foot
(42
mm/m). There must also be a
12-inch
(305
mm) minimum drop from this peak to the
through-hull outlet fitting as shown in Figures 6-1 and
6-2.
Allow space between the marine muffler and
its
mounting
surface by use of spacers under the mounting flanges.
This allows air circulation under the muffler and discour-
ages condensation build-up.
6-1
To Next Page
Loading...
Need help?
General
