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Vibrating Screen Bed
Depth Formula |
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800.440.6374 Phone 360.835.7507 sales@wovenwire.com |
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| The feed to a
vibrating wire mesh screen contains a mixture of material in
varying sizes. The oversized material will retard passage of the
undersized material, creating a temporary restriction which
results in a build-up (bed) of material on the surface of the
screen. |
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| Bed depth
diminishes as the undersize material passes through the wire
mesh screen apertures. |
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| The material bed
should not be allowed to reach a depth that prevents the
undersize from stratifying before discharge at the wire mesh
screen surface end. |
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| Generally, the
discharge end bed depth should not exceed four times the size of
the wire mesh screen surface aperture when separating 100 lbs.
per cubic foot material, or three times for 50 lbs. per cubic
foot material. |
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| Aggregate, Ore and
Gravel Screening Formula for calculating theoretical discharge
end bed depth: |
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O x C |
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| DBD =
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= Inches of Bed Depth |
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5 x T x W |
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DBD = |
Discharge End Bed
Depth |
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O = |
Oversize in STPH |
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C = |
Cubic Feet Per Ton of
Material |
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5 = |
Formula Constant |
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T =
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Rate of Travel
(nominal 75 fpm for inclined screen at slope of 18º
to 20º with flow rotation and nominal 45 fpm for
horizontal screen) |
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W = |
Width of Screening
Area in Feet |
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