1. Screw conveyors are suited to transport of even sticky and abrasive solids up inclines of 20” or so. They are limited to distances of 150ft or so because of shaft torque strength. A 12in. dia conveyor can handle 100@3000cuft/hr, at speeds ranging from 40 to 60 ‘pm.
2. Belt conveyors are for high capacity and long distances (a mile or more, but only several hundred feet in a plant), up inclines of 30” maximum. A 24in. wide belt can carry 3OOOcuft/hr at a speed of lOOft/min, but speeds up to 6OOft/min are suited to some materials. Power consumption is relatively low.
3.Bucker elevators are suited to vertical transport of sticky and abrasive materials. With buckets 20 x 20 in. capacity can reach 1000 cuft/hr at a speed of 100 ft/min, but speeds to 300 ft/min
are used.
4.Drug-type conveyors (Redler) are suited to short distances in any direction and are completely enclosed. Units range in size from 3 in. square to 19 in. square and may travel from 30 ft/min (fly
ash) to 250 ft/min (grains). Power requirements are high.
5.Pneumatic conveyors are for high capacity, short distance (400 ft) transport simultaneously from several sources to several destinations. Either vacuum or low pressure (6-12psig) is employed with a range of air velocities from 35 to 120ft/sec depending on the material and pressure, air requirements from 1 to 7 cuft/cuft of solid transferred.
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