Selective pallet rack is the most common type of pallet rack. Selective pallet rack consists of uprights and load beams.
- Uprights are available in a variety of depths, heights, and capacities. The upright depth is determined by the depth of the pallets being stored. Since a majority of pallets are 48” deep, the most common upright depth is 42” (this allows for a 3” pallet overhang on the front and rear side for safe loading). The upright height is determined by the ceiling height, the number of beam levels, and the reachable height of the lift equipment being used. The most common upright heights are 12 ft, 16 ft, and 20 ft. The upright capacity must be greater than the combined capacities of the load beams in a section or “bay” of rack. The upright capacity is a factor of the type and gauge of steel, and the depth and height of the upright.
- Beams are available in a variety of lengths and load capacities. The beam length is determined by the widths of the pallets being stored. Generally two pallets are stored side by side in a bay of rack. The most common beam lengths are 96” which allows for (2) 40” wide pallets to be stored on a beam level and 108” which allows for (2) 48” wide pallets to be stored on a beam level. The beam capacity is a factor of the type and gauge of steel, the length of the beam, and the height of the beam. The beam capacity needed is determined by the maximum weights of the pallets being stored.
Although, Selective Pallet Rack is the most common and least expensive rack, it also offers the least dense pallet storage capacities, since pallets are stored only one deep. Generally selective rack requires 10-12 ft forklift aisles. However, a “narrow aisle” system can be utilized with the use of narrow aisle forklifts, which are quite a bit more expensive than the standard warehouse trucks.
Other types of pallet storage rack which provides for a greater storage density than selective pallet rack are:
- Drive-In Rack
- Push-Back Rack
- Pallet Flow Rack
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