Figure 5.2: Shelving, or static rack. (Adapted from “Warehouse Modernization and Layout Planning Guide”, Department of the Navy, Naval Supply Systems Command,NAVSUP Publication 529, March 1985, p 8–17.)
Simple shelving is the most basic storage mode and the least expensive (Figure 5.2).The shelves are shallow: 18 or 24 inches (0.46 or 0.61 meters) are typical, for example,but 36 inch (0.91 meter) deep shelf is sometimes used for larger cartons. Because the shelves are shallow, any signifificant quantity of a SKU must spread out along the pick-face. This reduces SKU-density and therefore tends to reduce pick density, increase travel time, and reduce picks/person-hour.
Skus which occupy more than one shelf of bin-shelving are candidates for storage in another mode that will enable greater SKU-density.
A typical pick rate from bin-shelving is 50–100 picks/person-hour. (Of course this and the pick rates for any equipment depends on which SKUs are stored there.)With shelving, both picking and restocking must be done from the pick-face and so, to avoid interference, must be scheduled at different times. This can mean working an additional shift.
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