Pallet racking is used for storage of products on pallets at up to considerable heights, while providing access to the individual pallets. APR consists of frames of pairs of uprights connected by bracing. Beams supporting the pallets span between these frames.
Rows of racking are usually placed back to back, with a clearance of 250-350mm between the inner uprights. Aisles between the racks allow loading by fork-lift trucks or stacker cranes. Loads from back-to-back racking, are commonly the governing case for slab design. The self-weight of the racking should be taken into account.
Pallets are commonly stored directly on the floor slab beneath the racking. Where rail-guided MHE is used, the first level of pallets is carried on beams close to the floor level.