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WHERE TO PLACE THE
SYSTEM
ı
FINDING THE BEST SOLUTION: If source capture is required, the first step is to quantify the airflow required to draw fumes and fine particles away from the welder. As a practical matter, to collect all particulates would require such a huge airflow that it would be detrimentally affect the welding process. So, the largest particulate will not be extracted. The collection of fine particles and the fumes that OSHA regulates is the mission.
CONFIGURING EQUIPMENT: 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 operation 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 rise or falls based on the length and diameter of the ductwork and the size of the hoods.
Where
to Place the System
For a
typical welding application involving carbon steel material,
the normal air-to-media ratio is approximately 2.0 to 2.5:1.
That is 2 to 2-½
cfm of air for every one ft. of filter media.
If we use 3,000 cfm and divide that by the air to media
ratio (2.5), that produces a requirement for 1,000 ft. of
filter media. That value is then divided by the square
feet of media in the filter (assume 226), and the result
will indicate a requirement for 5.3 cartridges.
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