One of the best kept secrets in making a producer's dust collection system more efficient is to make sure the ducting is properly installed.

While installing a dust collector, fabricators often overlook simple practices that can be crucial in making sure a collector will work optimally.

Here is a list of Do's and Don'ts prepared by engineers at C&W Manufacturing of Alvarado, Texas.

DO :

  • Locate the dust collector as close as possible to the pick-up point at the shroud/truck-charging area.
  • Ensure you have proper sizing of the duct from the truck-charging area to the dust collector. Proper duct size is determined by the CFM at the truck charging point and the line velocity of the material you are handling.
  • Ducting should be installed at a 45-degree angle or greater to avoid level draft areas that can slow air flow.
  • Ensure ducting is watertight and is well supported. It is best to schedule a double inspection of the ducting to guarantee it is watertight.
  • Incorporate flanges at every branch and at the entry into the silo so personnel can disconnect the duct and clean out sections. Regardless of precautions, ducts clog over time when moisture meets cement dust.
  • DON'T:

  • Do not run ducting like plumbing; do not run it horizontally or at 90-degree angles.
  • Do not use hammers to clear clogs. Although this clears lines, hammering breaks undetectable seams, allowing moisture to seep in. Instead of hammers, use wrenches for disconnecting flanges to clean out clogged lines.
  • When using a central dust collector to cover fugitive dust points on silos, do not have the duct line to the silo near the silo's fill-line. The fill-line should face away from the dust collection point.
  • Do not connect ducting at the weigh scale to the central collector's ducting. Use a separate weigh batcher collector.
  • Ts should never be used in ducting. Use long sweeping 90s, 45-degree angles, Y transitions, or Y-type fittings.
  • Keep flex ducting at a minimum. Only use it to connect the ducting at the weigh scale connection point and the shroud.
  • Run it vertically; if it is horizontal or at a 45-degreee angle, flex ducting will begin to clog and drop downward.

    For more information, contact C&W at 800-880-DUST, or visit the company's Web site at

    To learn more about the following dust control systems, circle the number on the reader service card.

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