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2.5.3
Dry exhaust system
2.5.3.1
General remarks
A dry exhaust muffler system should be very effective in
silencing the exhaust when applying the right mufflers.
However noise could be generated by vibrations in the mufflers
and be transferred to the chassis. Tacit factors like the length of
specific pipe sections could cause the noise to be amplified. It is
very difficult to take these factors into account.
The standard WhisperPower exhaust kit contains the materials
to perform a professional installation. It includes a stainless
steel flexible bellow (hose) to allow for expansion and to
prevent vibrations from being transferred. Rubbers are supplied
to mount the mufflers flexible. The insulation blanket for the
flexible bellow and the resonance muffler are also very
effective in damping vibrations. Still it could be that additional
measures has to be taken like an extra clamp in a vibrating
section of pipe, insulation blankets on other parts of the system
and possibly even additional mufflers.
When the exhaust is led through the roof of a
vehicle, measures have to be taken to prevent
rainwater to enter the system. Special rain caps
are available as an option.
Figure 20: Ways to prevent water from getting in
W-SQ 27 kVA / 25 kW — October 2014 — EN
A negative feature of a dry exhaust system is the heat radiated
by its components. Measures are taken to overcome the heat
problem: The exhaust bent to bring the exhaust out of the
canopy is cooled by water. Insulation blankets are included in
the exhaust kit to insulate the flexible bellow and the first
muffler.
When a dry exhaust has its outlet on the roof, all the pipes
inside the vehicle has to be insulated.
The exhaust pipes will be very hot and all
accessible pipes and mufflers are dangerous to
people when not insulated.
There are companies that are specialized in insulating hot pipes
and fancy systems are available to make it good looking.
However it is also possible to do it yourself by winding
fiberglass or Rockwool around the pipes and seal it with
aluminum tape.
2.5.3.2
The standard dry exhaust system
The standard exhaust system contains:
On the generator set:
•
An insulated exhaust bend
In the exhaust installation kit:
•
A stainless steel shielded flexible bellow
•
One resonance muffler
•
One absorption muffler
•
Clamps and rubbers to mount the system flexibly
•
Fittings, bents and pipes to make the various
connections
•
Blankets for thermal and sound insulation.
The mufflers are high quality industrial mufflers that are much
more effective, robust and durable than mufflers made for
automotive use.
INSTALLATION
11
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