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Why is Angle of Repose important to Grain Quality & Grain Safety?

The angle of repose is the maximum angle at which an object can rest on an inclined plane without sliding down.Grain that forms an angle steeper than its angle of repose may indicate a potential problem with grain condition imposes entrapment and engulfment hazards workers should evaluate the grain's angle of repose prior to entering grain storage structures and when working with grain storage piles, pods, in bunkers. 

What is the Angle of Repose?

The angle of repose is the maximum angle at which an object can rest on an inclined plane without sliding down. A material with a low angle of repose forms flatter piles than a material with a high angle of repose.
 
When bulk materials are poured onto a horizontal surface, such as within grain storage structures, grain pods, bunkers, or exterior ground piles, a conical pile will form. The angle of repose is related to the density, surface area, shapes of the particles, and the coefficient of friction of the material.
 

Why Angle of Repose Matters to Grain Handling?

Grain that forms an angle steeper than its angle of repose may indicate a potential problem with grain condition imposes entrapment and engulfment hazards workers should evaluate the grain's angle of repose prior to entering grain storage structures and when working with grain storage piles, pods, in bunkers. The requirements outlined in OSHA's Grain Handling State Standard 1910.272 must be implemented when applicable.
 
The angle of repose of granular material, such as grain, is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without sliding. At this angle, the material on the slope face is on the verge of sliding. The angle of repose can range from zero to 90 degrees depending on the material.
 
Angle of Repose by Commodity:
  • Corn approximately 21.5 to 23 degrees
  • Soybeans approximately 25 degrees
  • Wheat approximately 25 degrees
  • Oats approximately 28 degrees

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