Exhaust gas system
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2.03
Gas
0317 BC
The thermal expansion must be absorbed by
compensators in the pipeline.
The exhaust pipe suspension must be arranged with
a fixed point as close as possible to the compensator
on the engine. The fixing point must be arranged to
direct the thermal growth of the exhaust pipe away
from the engine.
Ref. BEAS drawing ”Exhaust pipe arrangement”.
Flexible connections and piping support
The piping system must be designed to allow for
thermal expansion without overstressing any com-
ponents in the system or on the engine. For this
purpose flexible connections have to be fitted.
BEAS normally supplies flexible connections to be
fitted on the transition pipe for turbocharger outlet.
Different types of flexible connections are used for
rigidly mounted and resiliently mounted engines.
The exhaust piping should be elastically supported
by means of dampers in order to keep the
transmission of structure borne noise, at a minimum.
Pressure relief devices
Fuel gas may enter the exhaust system through the
engine as a result of one or more malfunctions.
If there is a source of ignition present, the gas may
become ignited. This enforces that the exhaust
system is designed so that the pressure build up, in
the case of such event, does not exceed the
maximum pressure level of the components in the
system. Silencer and engine mounted exhaust
bellow are designed for a max pressure of 1 barg.
This results mandatory requirement of fitting safety
devices to the exhaust system, such as pressure
relief valves or rupture discs, to limit any explosion
pressure.
Installation of pressure relief device to the exhaust
system is mandatory. Other equipment’s such as
waste heat recovery boiler and catalytic converters
must have integrated pressure relief devices.
The size, number and positioning of such devices
should be verified by calculation or simulation in
each case, subject to classification approval
as required.
The discharge of such devices should be led to a safe
place remote from any ignition sources.
The discharge may consist of combustion gases or
unburned fuel depending on the propagation of
uncontrolled combustion inside the exhaust system.
The extension of the safe zone with respect to hot
exhaust gases depend very much type of safety
device – with flame arresters this can be reduced
significantly.
In order to reduce the risk of accumulating fuel in
the exhaust system, the piping and all other
components in the exhaust system should have a
constant upward slope. Silencers, boilers and other
equipment should be designed such that no fuel gas
can accumulate inside.
NOTE
Please contact our Technical Sales Support to find
the appropriate design solution for your project.
Silencer
Our standard silencer is of the reactive - absorptive
type with spark arrester, and it can be installed in any
position, but preferably in vertical position.
It is equipped with a soot collector and a water
drain, but is without mounting brackets and
insulation. The noise attenuation of the standard
silencer is 25 - or 35 dB(A).
Supporting of the silencer
The silencer has to be well supported by means of
a steel or concrete structure.It should be supported
by the body and not from the pipe connection.
Exhaust gas boiler
If you have a boiler it has to be a separate exhaust
gas boiler, alternatively a separate section of a
common boiler. Exhaust gas flow and temperature
found in Technical data, part 1.04, are used for
dimensioning the boiler. Regarding pressure drop
through the exhaust gas boiler, see separate
instructions from supplier.
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