Screw conveyors are volumetric conveying devices. With each revolution of the screw, a fixed volume of material is discharged. Screw conveyors are always control fed at the inlet by another conveyor or metering device. The flow rate or capacity of a screw conveyor is measured in cubic meter per hour.

For the selection of a screw conveyor system, presented in a series of 5 steps. These steps are:

  1. Establishing the characteristics of the material to be conveyed.
  2. Locating conveyor capacity (conveyor size and speed) on capacity tables.
  3. Selection of conveyor components.
  4. Calculation of required horsepower.
  5. Checking of component torque capacities (including selection of shaft and sizes)

Standard Size for Screw Conveyor base on the screw flight outer diameter are 4", 6", 9", 12", 16", 20", 24".