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CONFIGURING EQUIPMENT1
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The
second step is to configure the equipment. The
distance from the source(s) to the collector is key.
Will one collector serve multiple hoods? If so, duct
losses will increase, and the airflow required for efficient
collection will rise.
The
capture velocities required to collect the material and the
sizing of the ducts transporting the material relate to the
development of static pressure, the airflow required with
the proper horsepower to achieve proper draw. This is
the most critical calculation, and the single most important
reason why filtration is generally not a simple
do-it-yourself project.
The
annual
Industrial Ventilation Conference has a course that
covers hood design, hood sizing and its relation to
ductwork, the conversion of velocity pressure to
CFM,
and other factors. Many
community colleges have similar programs. Probably the
best reference book in the industry is the Industrial
Ventilation manual. It can be obtained by attending
the conference or through the
American Conference of Governmental Industrial Hygienists in
Cincinnati, OH.
It was
recommended earlier that shops consider future requirements
right from the start. The reason is that any addition
of equipment, or increase in the distance between system
components, necessitates revision of the design. Systems
designed with a fan operating at a given
RPM will produce a
given cfm against a given static pressure. Change any
element of this equation and you change everything else.
The airflow required to achieve a given result rises or
falls based on static pressure which, in turn, is based on
the length and diameters of the ductwork and the size of the
hoods.
ıPhil Weber, Welding Processes Pose Tough Challenge for
Fume Filtration, (Welding Design and Fabrication) 9/03
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