Bucket Elevators and Carriers

TABLE 5.3. Bulk Densities, Angles of Repose, and Allowable Angles of Inclination 

Material Average Weight (Ib/cuft) Angle of Repose (degrees) mended Maximum Inclination 

Other tables of these properties appear in these publications  

Conveyor Equipment Manufacturers Association, Belt Conveyors for Bulk Materials, 1966, pp. 26-33. 

FMC Corporation Material Handling Equipment Division Catalog 100, 1983. pp. B.27-B.35. 

Conveyor Equipment Manufacturers Association, 6e/t Conveyors tor Bulk Materials, 19. 25-33. 

TABLE 6.4. Sizing Data for Screw Conveyors (a) Diameter (rpm and cuft/hr) 

of Con- Max. Lump Size, At Maximum fUeommend-ed Speed At One R.P.M, Speed p.m. At Maximum Recommended Speed At One R.P.M. 

of Con- veyor, Znehea A Max. Lump Size, Znehei Maximum Reeommended 8p r.pTm. Capadtica, Cubie Feet Per Hour Maximum Capadtlae, Cubic FWt Per Hour  

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Use of the 18-in. spacing between the concentric rings of holes in the catalyst-flow plates of the commercial TCC units ensures uniform catalyst flow at all points higher than 27 in. above the top plate. Catalyst-flow rate in a given plant is relatively inflexible. Moreover, the design catalyst-circulation rate is limited, principally because of the cost of mechanical bucket elevators, to values of 1.5 to 2.5 times the oil-feed rate (51). These catalyst/oil ratios correspond to catalyst-circulation rates of the order of 100 to 150 tons/hour in a 10,000-barrel/day unit. Typical catalyst velocities are 6 to 12 in. per minute in the reactor and regenerator, and 1 to 2 ft. per second in catalyst-carrier lines (241). 

Look for signs of interference between the chain or sprockets and any othCT parts of the machine. Check for contact between the chain and any outside objects. Most chains for conveyors and bucket elevators have attachments carriers, flights, buckets, or crossbars may be added to the chain. These added items increase the chances for interference with a machine member or outside objects. 

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