Exhaust system
24
Introduction
The exhaust system should be planned at the layout
stage of the installation. The main objectives are to:
•
ensure a that the backpressure of the complete
system is below the maximum limit determined by
the engine manufacturer.
•
keep weight off the engine manifold and turbo-
charger by supporting the system.
•
allow for thermal expansion and contraction.
•
provide flexibility if the engine is set on anti-vibra-
tion mountings.
•
reduce exhaust noise.
The figure shows an example of how a dry exhaust
line can be designed and installed. The line should
preferably be made of acid-proof stainless steel pipe,
but a satisfactory service life can also be obtained
with other stainless steel pipe. Copper pipes must
not be used for diesel engines. Due to the high tem-
peratures, 400°C–500°C (842°F–932°F) in the dry
exhaust line, it must be insulated with insulating ma-
terial to avoid the risk of fire and personal injury.
The line must also be provided with a flexible com-
pensator () to absorb heat expansion and vibration
from the engine. The compensator is fitted on the
engine exhaust pipe flange as straight and stress-re-
lieved as possible.
The exhaust line must be insulated throughout its
whole length. Note that the movements of the com-
pensator must not be obstructed. After the compen-
sator, the exhaust line, including silencer (4), must
be suspended by flexible brackets (2, 3) so that the
movements caused by heat expansion are not ob-
structed.
The exhaust outlet is placed in a suitable position
with good margin of clearance above the water-line
with loaded boat and with insulation against the hull
side to prevent heat damage.
An arrangement for draining condensation water
should be fitted at the lowest point of the line (5) and
as close to the engine as possible.
When dimensioning the exhaust line, note that the
backpressure in the complete exhaust system must
not exceed the values shown in table in chapter
Backpressure.
NOTE! U.S. federal regulations applicable to U.S.
vessels require the installation of an exhaust sam-
pling port in the exhaust system. See chapter
Gen-
eral under Exhaust system.
Dry exhaust line
3
3
4
3
2
5
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