AIR DISCHARGE
Improper air trunking installation from the cleaner and into the collector causes up to 90%
of the difficulties in conjunction with improper air movement. Sharp turns, improper
junctions, poor connections and poor collection equipment will all contribute to air
deficiency in a cleaner. Improper air clearance also results in a very dirty, dusty plant
operation. The Prelude back fan develops sufficient velocity so that cyclone-type collectors
or dust houses can be used to settle the dust and chaff from the air discharge of the
cleaner. The following are a few of the common errors found in plants and how each can
be avoided or corrected.
Refrain from installing elbows which have a sharp change of direction. Backpressures are
created at such points. In most cases, light chaff will be dropped into the pipe and finally
plug the entire run. A rule of thumb used at our plant is that the inside radius of the elbow
would be
at least two and one half times the recommended
diameter of the air pipe.
CFM Requirements - 1900 RPM................................6000 18” Diameter Pipe
CFM Requirements - 1600 RPM................................4300 17” Diameter Pipe
CFM Requirements - 1200 RPM................................2800 14” Diameter Pipe
The final source of trouble is the cyclone itself. If it is either too large or too small, or isn't
designed properly, or has a cap over the pipe discharging from the top of it, or in some
other way causes back pressure or pressure drop, or turbulence that interferes with the
cocooning action of the air inside the collector, the cleaner air system or the collector
system may not function properly.
