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Cyclone Dust Collector & Cut-Point Calculator environmental
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Cyclone Dust Collector & Cut-Point Calculator

Calculate cyclone cut-point diameter (d50), fractional particulate collection efficiency, gas inlet velocity, and static pressure drop per Lapple and Stairmand models.

Inlet Airflow & Cyclone Model

Particulate Properties

Cyclone Separation Performance

Cut-Point Diameter (d50)
-- µm
--% efficiency at target size
Inlet Gas Velocity
-- FPM
-- ft/s (50-70 ideal)
Cyclone Pressure Drop
-- in. w.g.
-- mm H2O
Efficiency at 5 µm: --%
Efficiency at 2.5 µm (PM2.5): --%
Inlet Dimensions (H x W): -- in x -- in
Optimal cyclone inlet velocity is between 3,500 and 4,200 FPM (60 to 70 ft/s) to maximize centrifugal vortex separation while preventing turbulent re-entrainment.

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Frequently Asked Questions

What is the cut-point diameter (d50) of a cyclone separator?

The cut-point diameter (d50) is the aerodynamic particulate size collected by the cyclone with exactly 50% separation efficiency. All dust particles larger than d50 are captured with greater than 50% efficiency, while smaller particles have a higher probability of escaping into the exhaust gas vortex.

Why are cyclones typically used as pre-cleaners upstream of baghouses?

Cyclones collect coarse, heavy particulate (typically > 10 to 15 microns) and glowing sparks with zero moving parts and zero filter media wear. Installing a cyclone pre-filter removes up to 80-90% of the raw dust mass, extending the operational life of downstream fabric filter bags by several years.

How does inlet gas velocity affect cyclone collection efficiency and pressure drop?

Centrifugal settling force increases with the square of inlet velocity, significantly improving small-particle capture. However, pressure drop and blower power also increase with the square of velocity, and velocities above 70 ft/sec (4,200 FPM) induce turbulent eddy currents that re-entrain separated dust.