Engineered Bulk Material Handling

Bulk Material Handling Equipment

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Screw Conveyor Engineering Guide

Standard Pitch, Single Flight

Conveyor screws with pitch equal to screw diameter are considered standard. They are suitable for a wide range of materials in most conventional applications.

Standard Pitch, Single Flight

Short Pitch, Single Flight

Flight pitch is reduced to 2/3 diameter. Recommended for inclined or vertical applications. Used in screw feeders. Shorter pitch retards flushing of materials which fluidize.

Short Pitch, Single Flight

Half Pitch, Single Flight

Similar to short pitch, except pitch is reduced to 1/2 standard pitch. Useful for vertical or inclined applications, for screw feeders and for handling extremely fluid materials.

Half Pitch, Single Flight

Long Pitch, Single Flight

Pitch is equal to l½ diameters. Useful for agitating fluid materials or for rapid movement of very free-flowing materials.

Long Pitch, Single Flight

Variable Pitch, Single Flight

Flights have increasing pitch and are used in screw feeders to provide uniform withdrawal of fine, free-flowing materials over the full length of the inlet opening.

Variable Pitch, Single Flight

Double Flight, Standard Pitch

Double flight, standard pitch screws provide smooth, regular material flow and uniform movement of certain types of materials.

Double Flight, Standard Pitch

Tapered, Standard Pitch, Single Flight

Screw flights increase from 2/3 to full diameter. Used in screw feeders to provide uniform withdrawal of lumpy materials. Generally equivalent to and more economical than variable pitch.

Tapered, Standard Pitch, Single Flight

Single Cut-Flight, Standard Pitch

Screws are notched at regular intervals at outer edge. Affords mixing action and agitation of material in transit. Useful for moving materials which tend to pack.

Single Cut-Flight, Standard Pitch

Cut & Folded Flight, Standard Pitch

Folded flight segments lift and spill the material. Partially retarded flow provides thorough mixing action. Excellent for heating, cooling or aerating light substances.

Cut & Folded Flight, Standard Pitch

Single Flight Ribbon

Excellent for conveying sticky or viscous materials. Open space between flighting and pipe eliminates collection and buildup of the material.

Single Flight Ribbon

Standard Pitch With Paddles

Adjustable paddles positioned between screw flights oppose flow to provide gentle but thorough mixing action.

Standard Pitch With Paddles

Paddle

Adjustable paddles provide complete mixing action, and controlled material flow.

Paddle