U = non-dimensional cross-sectional area shape factor
b = contact perimeter between bulk material and belt (m, ft)
Non-dimensional cross-sectional area shape factors for various troughing belts are available from manufacturers' handbooks.
The product cross sectional area is defined by the idler trough shape and the product pile on top of the idler trough the trapezoid shape. This section on top of the trapezoid can be described with a circle and the angle this circle makes with the belt is the surcharge angle.
|Ashes, coal, dry||25|
|Ashes, coal, wet||25|
|Ashes, gas producer, wet||30|
|Bauxite, ground, dry||20|
|Bauxite, mine run||20|
|Beet, pulp, dry||30|
|Brewers grain wet||30|
|Carbon black, pelletised||5|
|Chalk, 100 mesh and under||25|
|Cinders, blast furnace||10|
|Clay, dry, fines||20|
|Clay, dry, lumpy||20|
|Coal, anthracite, 3mm and under||20|
|Coal, anthracite, sized||10|
|Coal, bituminous, mined 50 mesh and under||30|
|Coal, bituminous, mined and sized||20|
|Coke, breeze, 6mm and under||20|
|Earth, as dug, dry||20|
|Earth, wet, with clay||30|
|Foundry sand, old sand cores etc.||25|
|Fullers earth, dry||10|
|Granite, broken, 75mm lumps||10|
|Gypsum, dust, not-aerated||20|
|Gypsum, dust, aerated||30|
|Gypsum, 75mm lumps||10|
|Iron ore, coarse crushed||20|
|Iron ore, crushed fine||20|
|Lead oxide, light||25|
|Lignite, air dried||10|
|Lime, ground, 3mm and under||30|
|Limestone, agricultural 3mm and under||10|
|Marble, crushed 12mm and under||10|
|Peanuts in shells||10|
|Phosphate, triple super ground fertilizer||20|
|Phosphate rock, pulverized||25|
|Salt, common dry, coarse||10|
|Salt, common dry, fine||10|
|Sand, bank, damp||30|
|Sand, bank, dry||20|
|Sand, Silica, dry||10|
|Slag, blast furnace, crushed||10|
|Soap, beads or granules||10|
|Soda ash, heavy||20|
|Soda ash, light||25|
|Sugar, raw, cane||20|
|Walnut shells, crushed||20|
|Zinc ore, crushed||25|
|Zinc ore, roasted||25|
The angle of repose is considered the static rilling angle of a stockpile.
|Angle of Surcharge |
|Angle of Repose|
|5||0 - 19||Uniform sized|
|10||20 - 29||Rounded dry medium weight|
|20||30 - 34||Granular and lumpy (like coal or Clay)|
|25||35 - 39||Larger lumps (like coal, stone, ores)|
|30||40 - 45||Irregular (like wood chips)|
The chart below indicates typical conveyor capacity vs. belt speed and belt width.
Multiply the volume capacity (m3/h) from the chart with the bulk density (kg/m3) of the product to estimate the weight capacity.
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