Exhaust System - Geko EISEMANN 250000 ED-S/DEDA Bedienungsanleitung

5.2.2.4 Exhaust system

The resistance to gas outcome exerted by the exhaust system has a great influence on the engine output
and its thermal mode.
Excessive resistance to gas outcome (in turbo compressor engines pressure is checked at the output of the
compressor) causes reduction of the engine output and increase of the temperature of the exhaust gas, is
a reason for the increase of smoke in the engine exhaust and fuel consumption and causes violation of the
heat mode of the engine and increase of temperature of the lubricating oil that makes a harmful influence
on engine parts.
It is not recommended to have the exhaust system pressure over 30...50 mbar.
To meet this requirement it is necessary to properly choose the corresponding diameter and length of
pipes of the exhaust system.
Exhaust system pipes
Usually the exhaust system is manufactured of smooth seamless steel pipes (UNI 1293).
The exhaust pipe should remove the exhaust gases to such a place where they cannot harm people's
health or environment.
The end of the pipe should be protected against possible penetration of rain water with a cap or similar
device.
The section of the pipe passing through a wall should be properly thermally isolated in order to prevent
heating of the wall.
Rock wool
The figure shows a detailed construction of the exhaust system.
The exhaust pipe should be as short as possible and have not so many bends.
When calculating the total length of pipes of the exhaust system and counter pressure at the output it is
necessary to sum up the resistance of the straight sections of the pipeline by adding to them the equivalent
length of the resistance of the bends as per the Table on page 13 depending on the diameter of the pipe.
The bends with the radius less than 2.5 diameter of the pipe cause huge losses; therefore, it is not recom-
mended to use them; if it is unavoidable a separate calculation should be performed.
In any case the diameter of the pipe should be not less than the diameter of the exhaust manifold of the engine.
If the diameter of the exhaust pipe is greater than the diameter of the manifold pipe in order to avoid great loss of head a transition piece with a taper of not more than 30° should be provided. In the
place where the exhaust pipe joins the electric power generator unit an expansion joint (compensator) should be provided.
Pipe joints should ensure excellent insulation preventing any leak of exhaust gases. It is better to use flange connections.
It is recommended to envisage a condensate trap in the lowest point of the exhaust system for collection of condensate, the trap being equipped with a drain plug.
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