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2. Engine Description 2.7 Exhaust System
2.7.1 Exhaust System
The Exhaust System is necessary to direct
exhaust gases to non confined areas &
reduce the noise level to tolerable level.
Exhaust system should exhert minimum
back pressure on engine. Exhaust back
pressure should be restricted to less than
50 mm of Hg.
Exhaust system consist of exhaust
manifold, adaptor & exhaust silencer.
Exhaust piping should be lagged to avoid
injury to operating personnel.
Total length of exhaust pipe should not
exceed 15 meters and should have
maximum of four right angle bends. Avoid
using elbows. Increase pipe I.D. by 1.5”
after every 5 meter length of exhaust pipe.
Expansion bellows & flexible pipes should
be installed between engine & exhaust
piping.
The exhaust pipe outlet should be bent so
that outgoing exhaust gases are not
recirculated. The exhaust pipe outlet
should be bent in the direction of wind &
the end should be cut at an angle of 45
0
.
There shold be rain trap to avoid rain water
entry. If rain cap is used the distance
between exhaust pipe & rain cap should
be 2.5 times diameter of exhaust pipe.
The figure above shows HA694 Engine
with exhaust outlet facing downwards.
Exhaust silencer is mounted separately on
the equipment & connected to exhaust
manifold by flexible piping.
The figure above shows HA394 Engine
with exhaust manifold cum silencer.
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