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Conveyors - Maximum Inclination

Maximum conveyor slopes for various materials

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conveyor slopes

Maximum conveyor slopes for various materials:

MaterialMaximum Slope
(degrees)
Alumina - sized or briquette 10
Anthracite coal 16
Ashes - wet 38
Ashes - dry 27
Bauxite - ground dried 23
Bauxite - mine run 17
Cement - Clinker 20
Cement - loose 22
Cement - Portland 28
Cinders 23
Clay - dry lump loose 21
Clay - ground 22
Clay - gray granular 20
Coal - bituminous slake 20
Coal - run of mine 18
Coke - screened 18
Coke - breeze 20
Coke - run of oven 18
Concrete - 6 inch slump (how wet the concrete is - based on the "slump test") 12
Concrete - 4 inch slump 20
Concrete - 2 inch slope 24 - 26
Coal - soft lumps > 4 inches 15
Coal - soft lumps < 4 inches 16
Coal - unsized 18
Coal - soft fine 20 - 22
Earth - loose 20
Earth - sluggish 22
Fieldspar - crushed 17
Furnace slag - granulated 13
Gravel - sized and washed 12
Gravel - unsized 18 - 20
Gypsum - ground 27
Gypsum - powder 23
Iron ore - limonite 28
Iron ore - soft 21
Kaolin - pulverized 32
Lime - burned pebble 15
Lime - burned pulverized 17
Lime - fine 29
Limestone - pulverized 34
Limestone - mixed sized 21
Limestone - coarse sized 12
Logs - no bark 10
Mica - ground 23
Molybdenite ore - powdered 25
Manganese 24
Ore - larger than 4 inches 18
Ore - less than 4 inches 20
Packages - wrapped in paper on smooth belts 16
Packages - wrapped in paper on ribflex belts or similar 25 - 45
Phosphate 14
Phosphate - pulverized 28
Salt 20
Sand - dry 16
Sand - damp moist 20
Sand - uniformly sized foundry high-quality silica sand or lake 24
Shale 26
Stone - crushed 18
Sulfur - powder 21
Stones - larger than 4 inches 15
Stones - less than 4 inches 16
Whole grain 15
Wood chips 25

Inclination or Slope Chart

Use this chart to estimate the inclination or slope angle of a conveyor. Measure the horizontal run and the vertical rise of the conveyor. Draw the lines in the chart to estimate inclination.

Inclination slope degrees chart

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