Sharp corners on the radiator, hot air outlet
channel or its chimney must be avoided. Some
rearrangements to turn thrown air should be
done (Figure 4.2 and 4.3).
Clearance around the generating set for cooling
and access for service: at least 1 meter (3.3 feet)
around the set and at least 2 meters (6.6 feet)
headroom above the set.
Access to move the entire generating set into
the room. Air inlet and outlet vents can often
be made removeble to provide an access point.
Limited access to unauthorized personnel.
If it is necessary to locate the generating set
outside of the building, the generating set should
be enclosed in a canopy. A canopy is also useful
for temporary installations inside or outside the
building.
4.5. FOUNDATIONS
VIBRATION ISOLATION
4.6. COMBUSTION AIR INLET
9
The generating set is shipped assembled on a
rigid baseframe that precisely aligns the alternator
and engine and needs to be bolted down only
to a suitably prepared surface.
Foundation
A reinforced concrete pad provides a rigid
support to prevent deflection and vibration.
Typically the foundation should be 150 mm to
200 mm (6 to 8 inches) deep and at least as
wide and long as the generating set. The ground
or floor below the foundation should be properly
prepared and should be structurally suited to
carry the weight of the foundation pad and the
generating set. (If the generating set is to be
installed above the ground floor the building
structure must be able to support the weight of
the generating set, fuel storage and accessories).
If the floor may be wet from time to time such
as in a boiler room, the pad should be raised
above the floor. This will provide a dry footing
for the generating set and for those who connect,
service or operate it. It will also minimize
corrosive action on the baseframe.
Air for engine combustion must be clean and as
cool as possible. Normally this air can be drawn
from the area surrounding the generating set
via the engine mounted air filter. However, in
some cases due to dust, dirt, or heat, the air
around the set is unsuitable. In these cases an
inlet duct should be fitted. This duct should run
from the source of clean air (outside the building,
another room, etc.) to the engine mounted air
filter. Do not remove the air filter and mount
it at a remote location as this can increase the
possibility of dirt leaking through the ductwork
and into the engine inlet.
Figure 4.2
Directing the air thrown from the
radiator with deviating wings
4.7. COOLING AND VENTILATION
The engine, alternator, and exhaust piping radiate
heat which can result in a temperature high
enough to adversely affect the performance of
the generating set. It is therefore important that
adequate ventilation is provided to keep the
engine and alternator cool. Proper air flow, as
shown in Figure 4.4, requires that the air comes
in at the alternator end of the set, passes over
the engine, through the radiator and out of the
room via a flexible exhaust duct. Without the
ducting of the hot air outside the room, the fan
will tend to draw that hot air around and back
through the radiator, reducing the cooling
effectiveness.
Figure 4.3
Weak ventilation installation
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Summary of Contents for ALP 10-5
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