Passive float valve. Designed to be installed in the outlet ducting of a dust collection system, this valve utilizes a mechanical barrier to isolate pressure and flame fronts caused by the explosion from propagating further through the ducting. The mechanical barrier reacts within milliseconds and is closed by the pressure of the explosion.
Backdraft damper. A mechanical backdraft damper is positioned in the inlet ducting. It utilizes a mechanical barrier that is held open by the process air and is slammed shut by the pressure forces of the explosion. When closed, this barrier isolates pressure and flame fronts from being able to propagate further up the process stream.
Flame front diverters. These devices divert the flame front to atmosphere and away from the downstream piping. Typically, these devices are used between two different vessels equipped with their own explosion protection systems. The flame front diverter is used to eliminate “flame jet ignition” between the two vessels that could overpower the protection systems installed.
Active devices include the following.
Chemical isolation. This system creates a chemical barrier that suppresses the explosion within the ducting, eliminates the propagation of flame, and minimizes pressure increase within connected process equipment.
Chemical suppression. This system detects an explosion hazard within milliseconds and releases a chemical agent to extinguish the flame before an explosion can occur.
Fast-acting valve. This valve creates a mechanical barrier within the ducting that effectively isolates pressure and flame fronts from either direction, preventing them from propagating further through the process.
Effectively controlling the dusts generated in food manufacturing facilities is an essential, life-saving legal obligation. Dust can cause serious harm to employee health, reduce product quality, and cause devastating explosions that can hurt or kill workers and bring irreparable damage to a food processing operation. A high-efficiency dust collector designed specifically for your facility is an accepted and proven engineering control that will filter hazardous contaminants to make indoor environments safer.
Steil, pharmaceutical market manager at Camfil Air Pollution Control, holds a Bachelor of Science degree in safety and industrial hygiene from the Indiana University of Pennsylvania. Reach him at David.Steil@camfil.com.