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Man B&W S50ME-B9.3-TII User Manual

Man B&W S50ME-B9.3-TII
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MAN B&W 15.04
Page  of 
MAN Diesel
MAN B&W S50MC6, S50MC-C/ME-C7/8, S50ME-B8/9 198 63 96-8.0
Exhaust gas silencer
The typical octave band sound pressure levels
from the diesel engine’s exhaust gas system – at a
distance of one meter from the top of the exhaust
gas uptake – are shown in Fig.15.04.0.
The need for an exhaust gas silencer can be de-
cided based on the requirement of a maximum
permissible noise level at a specic position.
The exhaust gas noise data is valid for an exhaust
gas system without boiler and silencer, etc.
The noise level is at nominal MCR at a distance of
one metre from the exhaust gas pipe outlet edge
at an angle of 30° to the gas ow direction.
For each doubling of the distance, the noise level
will be reduced by about 6 dB (fareld law).
When the noise level at the exhaust gas outlet to
the atmosphere needs to be silenced, a silencer
can be placed in the exhaust gas piping system
after the exhaust gas boiler.
The exhaust gas silencer is usually of the absorp-
tion type and is dimensioned for a gas velocity of
approximately 35 m/s through the central tube of
the silencer.
An exhaust gas silencer can be designed based
on the required damping of noise from the ex-
haust gas given on the graph.
In the event that an exhaust gas silencer is re-
quired – this depends on the actual noise level
requirement on the bridge wing, which is normally
maximum 6070 dB(A) – a simple ow silencer of
the absorption type is recommended. Depending
on the manufacturer, this type of silencer nor-
mally has a pressure loss of around 0 mm WC at
specied MCR.
Spark arrester
To prevent sparks from the exhaust gas being
spread over deck houses, a spark arrester can be
tted as the last component in the exhaust gas
system.
It should be noted that a spark arrester contrib-
utes with a considerable pressure drop, which is
often a disadvantage.
It is recommended that the combined pressure
loss across the silencer and/or spark arrester
should not be allowed to exceed 100 mm WC at
specied MCR. This depends, of course, on the
pressure loss in the remaining part of the system,
thus if no exhaust gas boiler is installed, 00 mm
WC might be allowed.
Fig. 15.04.02: ISO’s NR curves and typical sound pres-
sure levels from the engine’s exhaust gas system.
The
noise levels at nominal MCR and a distance of 1
metre
from the edge of the exhaust gas pipe opening at an angle
of 30 degrees to the gas ow and valid for an exhaust
gas system – without boiler and silencer, etc. Data for a
specic engine and cylinder no. is available on request.
178 59 42-1.0
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Man B&W S50ME-B9.3-TII Specifications

General IconGeneral
BrandMan
ModelB&W S50ME-B9.3-TII
CategoryEngine
LanguageEnglish

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