Aisle width and turning radius: how equipment dimensions dictate rack layout
The aisle width is determined by the working aisle of a specific machine with a fixed-size pallet. The turning radius shows the maneuverability of the equipment itself, but does not take into account the full trajectory of the load when installed at right angles to the rack. Therefore, always select equipment and plan rows together. A difference of even 0.5 m in several aisles can change the warehouse capacity by hundreds of pallet spaces.
How does a working corridor differ from a turning radius?
For planning, use the nominal width of the working aisle Ast for the required pallet size and orientation. This parameter already takes into account the geometry of the machine with the load during stacking. Use the turning radius additionally for intersections, row ends and maneuvering areas.
Enter the pallet dimensions, maximum weight, Ast, lifting height and residual load capacity on the upper tier into the specification. This way, the warehouse equipment is matched to the actual geometry of the room.
Also check the width of the cross aisle at the ends of the rows. The machine must exit the aisle, turn around and enter the adjacent row with the working pallet. To do this, use the passport dimensions of the equipment with the load and the actual geometry of the columns, gates and fences.
How machine type changes planning
More compact equipment allows for fewer aisles, but each class solves different operational problems.
a regular forklift is convenient for universal routes and work near docks;
warehouse stackers are suitable for shorter internal routes and moderate heights;
The reach truck is focused on high-altitude pallet systems and a narrower working aisle.
The final figure is taken from the passport of a specific model. Additional criteria for choosing compact machines are analyzed in the guide on electric stackers . You can read more about the features of working at height in the material on narrow aisle equipment .
How 50 cm of aisle space is transformed into pallet space
The economy is calculated through the full module: depth of the rack row + aisle width.
Let's take a hypothetical warehouse with a usable width of 30 m and a double row of racks 2.4 m deep.
With a 3.5 m aisle, the module takes up 5.9 m, with a 3.0 m aisle, it takes up 5.4 m. Five modules in the first scenario require 29.5 m, and five in the second require 27 m. The freed 2.5 m already allows us to check the possibility of an additional row in the overall layout.
If the new row has 40 sections, 4 levels, and 2 pallets per level, it adds 40 × 4 × 2 = 320 pallet spaces. This is how the racking configuration is translated from centimeters to capacity.
When comparing two plans, count the pallet spaces in the entire usable area, including end aisles and manoeuvring areas. An additional row may require a different width of the cross-aisle or a change in the receiving area. Therefore, check each scenario as a complete traffic pattern: racks, aisles, intersections and turning points.
When a narrow aisle warehouse is economically beneficial
A narrower aisle is justified if the value of the additional capacity exceeds the difference in the cost of the equipment and its operation. To calculate, determine how many additional pallet spaces the new scheme provides, assess their financial effect and compare it with the additional costs for equipment, charging infrastructure, and service.
Before approving the scheme, check the Ast with the working pallet, the lifting height, the residual load capacity, the peak flow of goods in the aisle and the number of pallet spaces in each scenario. For a narrow aisle warehouse, the optimal option is the one that provides the required throughput at the maximum economically justified capacity.