There are several different types of screw conveyor systems, including screw conveyors, screw feeders and screw-lifts. Screw conveyors should be guarded to prevent worker contact with turning flights. The conveyor housing should enclose all the moving elements. Feed openings for shovel, other manual or mechanical equipment should be designed so the conveyor rotating and moving parts are enclosed and restrict access to the conveyor. For example, the conveyor opening should be covered with suitable grating. If the nature of the material is such that a grating can not be used, then the exposed section of the conveyor must be guarded by a railing or a fence.

Electrical interlocking devices should be used. If the conveyor must be opened for inspection, cleaning, maintenance or observation, the electric power to the motor driving the conveyor must be locked out in such a manner that the conveyor can not be restarted by anyone until the conveyor cover or guards have been properly replaced.

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