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NFPA 77 covers the subject of static electricity and its hazards. It reflects the level of understanding of static electricity and presents considerable information that explains the fundamental aspects of the phenomenon and recommendations for evaluating and controlling potential hazards. New information has been provided to address specific hazards of flammable gases and vapors and combustible dusts and also to address specific industrial processes and operations. It also provides the user with acceptable methods of grounding, correcting the mistaken belief that the ground wire needs to run the length of the bag.

NFPA 77 states the following:

"Bags and cages should be engineered so that a positive ground connection is always maintained. One way of doing this is by sewing two metal braids into the cuffs of the bags, 180 degrees apart. Each braid is continuous and is sewn up the inside of the cuff, across the top, and down the outside of the cuff. Therefore, the braids will always make a positive contact with the cage and will withstand the rigors of the operations. Because the bag is nonconductive, the bag itself is not grounded. It is therefore useless to extend the metal braid down the entire length of the bag.

There is no evidence that filter bags made from conductive or antistatic fabric is needed to prevent incendive discharges. On the contrary, such bags could create discharge hazards if sections of the fabric become isolated or if a bag falls into the bottom of the bag house (NFPA 77, 8.9.2 and 8.9.3, 2000 Edtn)."

If you have a problem with static buildup in your baghouse, Winger Inc. offers various options to solve this condition. Contact Us and we will perform a thorough risk evaluation at your facility to identify and eliminate factors that could contribute to an explosion. This is one of the mandatory requirements set forth in the NFPA standards for the handling of combustible dusts, which are now being enforced by OSHA and local authorities.

Winger also offers equipment for the process industries
Feeder Systems
Day Filters™
A Winger Inc. Company
5500 Lakeland Ave N. Crystal, MN 55429
Phone: 763-795-9779
Fax: 763-795-9889

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