In a dust collecting system, the duct, fan, and dust collector are all susceptible to abrasion from dust particles, high-velocity gas flow, and chemical corrosion. The elbows are most vulnerable to abrasions. Air leakage around an access-door or hopper and loose flange isn’t uncommon either. Many times, these holes on ductwork, fans, and dust collectors are not repaired and left alone, so they grow bigger and bigger and air leakage becomes an even worse problem. Airvate did some calculations to estimate sucked-in air volume through a hole based on available data regarding the hole’s area and gauge pressure inside of a duct or dust collector. The calculations are listed in the table below. Along with the sucked-in air volume, moisture volume is also listed in the last column for an 8-hour shift assuming that the sucked-in air is saturated with water vapor, like what would happen on a rainy day. 4 hole-sizes are selected: 3 round holes of sizes 7/16”, ½”, and 1” in diamet...
Air Pollution Control and Industrial Ventilation Technologies and Services