PiF-D/SD Series – Design for explosive and combustible dust collection –

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.

Anti-electrostatic molded filter

Pulse jet

Inflammable powder/dust that might explode

Max. airflow

Premium efficiency motor/Dust explosion-proof motor


  • 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).

Anti-electrostatic molded cartridge filter

Material: Polyestet
Surface treatment: Stainless evaporation
Corresponding models: PiF-D/SD
Application: electrification characteristic dust(particle diameter about 10μm)
Others:  Aluminum sheet and Earth

Finefil Antistatic filter and other type of filter are avilable


Dust and powders that might cause explosions

- Magnesium
- Aluminum
- Aluminum light alloys
- Iron powder (non-oxidized)
- Epoxy Resin
- Cornstarch
- Titanium
- Toner
- Coal Dust
Other inflammable powders

Three conditions leading to dust explosions

1. Oxygen
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

Dust explosion-proof motor

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.

Aluminum fan casing, impeller, and inducer

Aluminum fan casing, impeller, and producer have mounted on the PiF-30SD and PiF-40SD. PiF-D series has mounted Aluminum fan inducer. It prevents to have sparks generated by the fans.

Anti-electrostatic molded cartridge filter

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.

Conductive paint

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.

Dustproof control box

Sealed electric control box is designed to structure that does not give triger of dust explosion.

Earth bonding

Eath Bonding is used to reduce the risk of electric sparks by connecting bonding conductors between particular parts, it reduces the voltage there might have been.

Fire extinguishing port

In case of fire in the dust collector, the fire extinguishing port is designed to load Fire extinguishing agent in to dust collector.

Check Valve

Explosion isolation check valve is to safeguard the surrounding workers as well as machinery. Explosion isolation involves stopping an explosion energy through the duct to suction point. the aim of the check valve is to stop blast explosion power from traveling throug duct.

Explosion pressure diffusion port

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

Model Kst value Pmax
PiF-30D 400 11.5
PiF-45D 400 11.5
PiF-30SD 400 11.5
PiF-45SD 400 11.5
PiF-60D 400 11.5
PiF-75D 300 10.0
PiF-120D 300 10.0
PiF-150D 300 10.0

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)

Internal design


Unit: mm


Particular Unit PiF-30D PiF-45D PiF-30SD PiF-45SD
Power Supply Volt 220 220 220 220
Frequency Hz 60 60 60 60
Phase 3P 3P 3P 3P
Output kw/hp 1.35/1.8 2.0/2.6 1.5/2 2.2/3
Max Airflow m³/min 30 45 22 35
Max. Static Pressure kPa 2.75 2.75 2.75 2.75
Filter Area 12.0 18.0 12.0 18.0
Suction Port Ø mm 150 200 150 200
Dimension (WxDxH) mm 775x1243x1569 786x1228x1600 556x1245x2247 681x1237x2392
Weight kg 290 340 375 435
Particular Unit PiF-60D PiF-75D PiF-120D PiF-150D
Power Supply Volt 220 220 220 220
Frequency Hz 60 60 60 60
Phase 3P 3P 3P 3P
Output kw/hp 3.1/4.1 5.5/7.3 7.5/10.0 11.0/14.7
Max Airflow m³/min 60 75 105 150
Max. Static Pressure kPa 3.00 3.10 3.205 3.10
Filter Area 24.0 38.4 57.6 86.4
Suction Port Ø mm 250 290 290 380
Dimension (WxDxH) mm 991x1209x1774 950×1519×2292 1398×1650×2389 1484×2009×3055
Weight kg 465 520 710 1020