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The
surcharge angle is that angle the material on the conveyor naturally
forms with the horizontal. Selecting this angle will define the
surcharge area, which is calculated to be the area of a segment of a
circle that is tangent to the surcharge angles at the two points that
represent the load width on the belt.
While
important to the calculation of conveyor capacity, the surcharge angle
is often only an approximation. It is best to be consistent with other
conveyors at the same site moving like material. There should be an
agreement between the Engineer and the Owner as to the surcharge angle
to be used. It is not necessary to take measurements. A range of
measurements would be needed to cover all material and weather
conditions. Using mConveyor to get capacity, you will provide for a
safety factor for all operating conditions including variations in the
surcharge angle.
Suggested Surcharge Angle Values:
5° Uniform Size, very small, very dry or very wet
10° Rounded, dry, polished, medium weight
20° Granular, lumpy, medium weight
25° Common materials, coal, stone, ores
30° Interlocking material, bagasse, wood chips, etc.
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