Flow Racking
Flow racking is a gravity-driven storage system in which cartons, totes, bins, or pallets move on inclined roller or wheel tracks from a loading side to a picking side, typically supporting first-in, first-out (FIFO) inventory rotation. Also called gravity flow racking or live storage, it uses the rack itself as the transport mechanism to present stored items at a fixed pick face.
On the shop floor, flow racks stage components at the point of use so operators pull the oldest container from the front while replenishment is loaded from the back, reducing walking and search time. Warehouses use carton flow lanes to present fast-moving SKUs at a fixed pick face, boosting pick density and cutting forklift travel. In pallet flow, slightly sloped roller tracks advance full pallets by gravity once the front pallet is removed, delivering high density with minimal aisles. The system enforces FIFO discipline naturally, which matters for ingredients, adhesives, and other time-sensitive materials where lot aging and expiry control are critical. Flow racks serve line-side feeding, kitting, supermarket replenishment, and small parts presentation. Because the rack itself becomes the transport mechanism, operators handle material once at put-away and once at picking, eliminating interim staging and repetitive searches across static shelving.
Is flow racking the same as pushback racking?
No. Flow racking is designed for gravity-fed FIFO movement from load end to pick end, while pushback systems store pallets on nested carts and follow a different retrieval sequence.
When is pallet flow preferable to standard selective racking?
Pallet flow is preferable when the operation needs high density, limited SKUs, and strict FIFO without aisle access to every pallet location.
What is the main control variable in flow rack design?
The rack pitch and lane friction/rolling resistance determine whether the load advances smoothly, stalls, or accelerates too quickly.