Double Deep pallet storage is a simple adaptation of placing one row of 100% selective rack behind another. Using a deep reach lift truck, the operator places the back pallet into the system first, and then places another pallet in front of it. While selectivity has been reduced by one-half over standard pallet rack, twice as many pallets are stored for a given number of aisles. This increases productive use of floor space about 60% to 65%.
Double deep storage rack has become a very popular choice in "high throughput" operations. It offers low initial cost, high productivity, good selectivity and less equipment damage However, t

he disadvantage include the need to have double reach trucks, loss of absolute FIFO and poor visibility for the truck driver when accessing the rear location.
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