Combustible dust is one of the most serious risks in most manufacturing plants. When the explosive dust becomes the right concentration of oxygen and contact with a source for ignition will trigger a dust explosion. a dust explosion can occur in many areas of manufacturing plants, but one of the most possible locations is the dust collector. That’s because dust collectors keep airborne dust in the limited to a particular space. An explosion in an unprotected dust collector can blast the dust collector body and sends fire, pressure, and dangerous projectiles into the workplace. This can critically injure personnel. Therefore, if you need to collect explosive dust, dust collectors should have the prevention and protection function of dust explosions.
FULFILLING SAFETY MEASURES.DUST COLLECTOR FOR EXPLOSIVE AND FLAMMABLE DUST.
- Designed to provide a high level of safety during collection of potentially hazardous particles.
- Explosion pressure diffusion port(pressure from explosion is discharged into air to prevent damage to the equipment).
- Extinguisher port (in the unlikely event fire occurs in the equipment, extinguishing agent is dispensed).
- Check valve (prevent reverse flow of blow force or fire to protect the worker).
Dust and powders that might cause explosions
- Aluminum light alloys
- Iron powder (non-oxidized)
- Epoxy Resin
- Coal Dust
Other inflammable powders
Three conditions leading to dust explosions
2. Dust in a concentration higher than the explosion lower limit threshold
3. Minimum ignition energy
Dust explosions occur when the 3 conditions of “oxygen,” “Dust concentration higher than explosion threshold,” and “minimum ignition energy” are all present. If even just 1 of these conditions can be eliminated, then dust explosions can be prevented. So the crucial point in preventing explosions is eliminating sources of sparks. Also, we need safety measures to protect your staff and facility from dust explosions, just in case.
Dust Explosion Prevention and Protection
Electric motors, for instance, involve moving parts that can cause sparking. Dust explosion-proof motor is designed to prevent the invasion of the outside substances and is designed to eliminate risks of sparks.PiF-30SD and PiF-45SD have mounted the motor. PiF-D series has mounted fully enclosed fan type motor.
Static electricity will make spark and could be ignition energy of dust explosion. Anti-electrostatic molded cartridge filter employs metal thread is woven into polyester technology and the filter has a strong and long time antistatic effect and reduces the possibility of generating spark cause by static electricity.
Countermeasures against the problem of a dust explosion caused by static electricity are indispensable. The antistatic coating Conductive paint is effective in preventing static electricity and noise by painting on metal and plastic. The conductive paint prevents the spark inside the dust collector and dust explosion.
Explosion pressure diffusion port is designed to be the “weak” area of the dust collector body, an Explosion pressure diffusion port opens when predetermined pressures are reached inside the collector, allowing the excess pressure and flame front to exit to a Explosion pressure diffusion port. It is designed to minimize damage to the dust collector and prevent it from blowing up in the event of a deflagration, thereby reducing the safety hazard.
Kst and Pmax value
The above Kst and Pmax value was covered calculated based on “Japan Explosive pressure discharge device technical guidelines(Revised version)NllS-TR-No.38(2005) in incorporated agency industrial safety institute laws. The above figures are for standard equipment. Please evaluate your target dust for explosion potential (option: dust powder explosion evaluation service are available)
|Max. Static Pressure||kPa||2.75||2.75||2.75||2.75|
|Suction Port Ø||mm||150||200||150||200|
|Max. Static Pressure||kPa||3.00||3.10||3.205||3.10|
|Suction Port Ø||mm||250||290||290||380|