Marine Installation Manual
2022-03
4-101
4 Ancillary Systems
4.10 Exhaust gas system
X62DF-S2.0
4.10
Exhaust gas system
The drawings relevant for the exhaust system (DG 9726) are provided on the
WinGD webpage under the following link:
Explosion relief devices
An explosion relief device examined and certified by the maker, with flameless
pressure relief, must be selected and installed within the exhaust system in ac
-
cordance with class requirements. The position and number of explosion relief
devices must be determined by the system designer or the shipyard through cal
-
culation.
Independent of the selected type of explosion relief device, the distance of the ex
-
plosion relief device to gangways, working areas and system components must
be at least 3m to not endanger personnel and/or to avoid material damage.
When a rupture disc with flameless pressure relief is selected and installed, pre
-
ventative measures must be taken to ensure that exhaust gas does not continu
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ously flow to the outside after rupture. This can be achieved with an exhaust gas
duct leading to the open deck, or in the case of a twin-engine installation by
sending a control signal to the Alarm and Monitoring System (AMS) requesting
a shutdown of the engine. If either of these options are not possible, a
self-closing, spring loaded valve must be used. This will remove the peak pres
-
sure of an explosion, while ensuring that the exhaust gas does not continuously
flow outside.
Flow velocities
For an optimised exhaust gas system the following velocities are recommended
for pipes A, B and C shown in
:
Pipe A ....... = 40m/s
Pipe B ....... = 25m/s
Pipe C ....... = 35m/s
For the pipe diameters please refer to the
application.
Figure 4
-
60 Determination of exhaust pipe diameter
d
B
d
A
d
A
d
A
d
A
d
A
SM-0109
d
C
