Pallet storage is easy, or at least easier than dealing with pipes and tubing
The idea behind pallets was to unitize and standardize the storage of standard blocks in racks designed to store those units. Standard units like pallets are easier store and handle. With pallets, you make sure your rack and forklifts can handle the pallet size and weight, and essentially you have a relatively dense, easily-accessed storage scheme. It’s more complicated for long, heavy loads like tube, bar stock and pipes. Let’s break down your options.