17.A.02 Safety devices.
- On all conveyors where reversing or runaway are potential hazards or the effects of gravity create a potential for hazardous uncontrolled lowering, anti-runaway devices, brakes, backstops, or other safeguards must be installed to protect persons from injury and property from damage.
- Conveyor systems must be equipped with a time-delay audible and visual warning signal to be sounded immediately before starting of the conveyor. On overland conveyor systems, the devices must be required only at the transfer, loading, and discharge points and those points where personnel are normally stationed.
- Safety devices must be arranged to operate in such a manner that if power failure or a failure of the device occurs a hazardous condition would not result. The safety devices must be designed to prevent the conveyor from restarting until the safety device is manually reset.
Is this conveyor properly guarded? Why not? Click on the image to find out why.
17.A.03 All exposed moving machinery parts that present a hazard must be mechanically or electrically guarded or guarded by location.
- Nip and shear points must be guarded.
- Take-up mechanisms may be guarded as an entity by placing standard railings or fencing, and warning signs, around the area in lieu of guarding each nip and shear point.
- In the case of a trolley conveyor when mechanical or electrical guarding would render the conveyor unusable, prominent and legible warnings must be posted in the area or on the equipment and, where feasible, areas barricaded or lines marked on the ground to indicate the hazard area.
- Guards must be provided at points where personnel could contact cables, chains, belts, and runaways of exposed bucket conveyors.
- Unless guarded by location, those sections of chain conveyors that cannot be enclosed without impairing the function must be provided with warning signs or personnel barriers.
- Trolley conveyors must be provided with spill guards, pan guards, or the equivalent if there is a potential for material to fall off the conveyor and endanger personnel or equipment.
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At transfer, loading, and discharge points, unconfined and uncontrolled free fall of material that may result from flooding, ricocheting, overloading, trajectory, leakage, or a combination thereof, must be prevented if the material would create a hazard to personnel.
Note: In the absence of a guard specifically erected to protect personnel, warnings must be provided to restrict unauthorized personnel from entering such hazardous areas.
- At all points along the conveyor, except at points where loads are removed from or placed on a conveyor or where a conveyor discharges to or receives material from another conveyor, provisions must be made to eliminate the possibility of loads or material being dislodged from the conveyor.
- The build-up of excess material must be removed from all points along the conveyor.
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17-2. What must occur immediately before starting conveyor systems?
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