"Choked leg" means a condition of material buildup in the bucket elevator that results in the stoppage of material flow and bucket movement. A bucket elevator is not considered choked that has the up-leg partially or fully loaded and has the boot and discharge cleared allowing bucket movement.
"Flat storage structure" means a grain storage building or structure that will not empty completely by gravity, has an unrestricted ground level opening for entry, and must be entered to reclaim the residual grain using powered equipment or manual means.
"Fugitive grain dust" means combustible dust particles, emitted from the stock handling system, of such size as will pass through a U.S. Standard 40 mesh sieve (425 microns or less).
"Grain elevator" means a facility engaged in the receipt, handling, storage and shipment of bulk raw agricultural commodities such as corn, wheat, oats, barley, sunflower seeds and soybeans.
"Hot work" means work involving electric or gas welding, cutting, brazing, or similar flame producing operations.
"Inside bucket elevator" means a bucket elevator that has the boot and more than 20 percent of the total leg height (above grade or ground level) inside the grain elevator structure. Bucket elevators with leg casings that are inside (and pass through the roofs) of rail or truck dump sheds with the remainder of the leg outside of the grain elevator structure, are not considered inside bucket elevators.
"Jogging" means repeated starting and stopping of drive motors in an attempt to clear choked legs.
"Lagging" means a covering on drive pulleys used to increase the coefficient of friction between the pulley and the belt.
"Permit" means the written certification by the employer authorizing employees to perform identified work operations subject to specified precautions.