Conveyors

A.  Pneumatic conveyors are best suited for high capacity applications over distances of up to about 400 ft.  Pneumatic conveying is also appropriate for multiple sources and destinations.   Vacuum or low pressure (6-12 psig or 0.4 to 0.8 bar) is used for generate air velocities from 35 to 120 ft/s (10.7-36.6 m/s).  Air requirements are usually in the range of 1 to 7 cubic feet of air per cubic foot of solids (0.03 to 0.5 cubic meters of air per cubic meter of solids).
B.  Drag-type conveyors (Redler) are completed enclosed and suited to short distances.  Sizes range from 3 to 19 inches square (75 to 480 mm).  Travel velocities can be from 30 to 250 ft/min (10 to 75 meters/min).  The power requirements for these conveyors is higher than other types.
C.  Bucket elevators are generally used for the vertical transport of sticky or abrasive materials.   With a bucket measuring 20 in x 20 in (500 mm x 500 mm), capacities of 1000 cubic feet/hr (28 cubic meters/hr) can be reached at speeds of 100 ft/min (30 m/min).   Speeds up to 300 ft/min (90 m/min) are possible.
D. Belt conveyors can be used for high capacity and long distance transports.  Inclines up to 30° are possible.  A 24 in (635 mm) belt can transport 3000 cu. ft./h (85 cu m/h) at speeds of 100 ft/min (30.5 m/min).  Speeds can be as high as 600 ft/min (183 m/min).  Power consumption is relatively low.
E.  Screw conveyors can be used for sticky or abrasive solids for transports up to 150 ft (46 m).  Inclines can be up to about 20°.  A 12 in (305 mm) diameter screw conveyor can transport 1000-3000 cu. ft./h (28-85 cu. m/h) at around 40-60 rpm.