KWS Manufacturing

Vertical Screw Conveyor Capacity & Horsepower Calculation

Capacity, Sizing, and Speed Table
Vertical Screw Conveyor
Diameter (Inches)
Maximum Recommended Capacity
(Cubic Feet per Hour)
Recommended Speed
Range (RPM)
6 400 200-215
9 1300 200-215
12 3000 165-180
16 6000 135-150

Note: Maximum capacity based on CEMA recommendation for vertical screw conveyors



Calculation by Equation for Total Horsepower

Friction Horsepower Calculation (Horsepower required to drive the conveyor empty)

Vertical Screw Conveyor Capacity and Horsepower Guide - Friction Horsepower Calculation

Material Horsepower Calculation (Horsepower required to move the material)

Vertical Screw Conveyor Capacity and Horsepower Guide - Material Horsepower Calculation

Total Shaft Horsepower

Vertical Screw Conveyor Capacity and Horsepower Guide - Total Shaft Horsepower

Equation Symbols

L Vertical Lift Height
N Conveyor Speed
Fd Diameter Factor
Fb Bushing Factor
Cw Conveyor Capacity (Pounds per Hour)
Cv Conveyor Capacity (Cubic Feet per Hour)
W Density (Pounds per Cubic Foot)
Fv Material Horsepower Factor (From Materials Table)
Fi Incline Factor
Fo Overload Factor (Correction for calculated horsepowers of less than five horsepower)
e Motor Efficiency

Note: Maximum capacity based on CEMA recommendation for vertical screw conveyors