Regards from Norway -
Modern storage and picking racks often combine small units, both bins and cartons, in flow-through for picking in the lower part, and ordinary pallet storage above. I believe this is common worldwide, but few sprinkler standards, if any, provide guidelines on vital parameters.
Case: We're dealing with ordinary open pallet racks. The commodity class is up to 3 (possibly 4). The picking height is up to 7-ft (2.0 m) based on mini wheel flow-throughs. Above that, there are 4-5 standard pallets with total net storage heights of 26-ft (8.0 m) in a building with a 39-ft (12 m) ceiling height.
It seems feasible to protect the pallets with ceiling-only sprinklers. However, there's no vertical alignment with any transverse flue spaces in the picking part. It seems logical to install a horizontal fire barrier above this area. How should we protect the lower part of the racks?
Should the ceiling sprinkler water demand be based on 26-ft (8 m) storage at a 39-ft (12 m) ceiling height, or 26-ft (8 m) at a 33-ft (10 m) ceiling height, measured from the top of the in-racks for the picking area?
I hope someone has a view on this matter. A not-yet-finalized version of EN 12845-1 has some parameters for systematically constructed automatic small unit storage, but my actual case is for manual operation and is not specifically systematic for the small units area in only a couple of the racks.
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