Pallet live storage is a warehouse rack system that uses inclined roller or wheel lanes to move pallet loads by gravity from a loading face to a picking face. It is useful when many pallets of the same product must move quickly through a limited floor area. By storing pallets several positions deep, it improves storage density while keeping the front pallet easy to access.
It is common in food, beverage, cold storage, manufacturing, and distribution operations where stock rotation and fast replenishment matter.
A typical lane is loaded from the high end, and each pallet rolls forward until it reaches a separator, brake roller, or pallet stop near the picking end. When the front pallet is removed, the next pallet advances into position under controlled speed. This supports first in, first out flow because the oldest loaded pallet is normally the first picked.
Good design depends on pallet weight, lane pitch, roller spacing, braking, safety clearances, and the compatibility of pallet type with the rack system.
Key Facts
- Pallet live storage uses gravity flow, so pallets move from the higher loading side to the lower picking side.
- FIFO means first in, first out, which supports stock rotation and reduces product aging.
- Grade or pitch can be estimated by slope = vertical drop / lane length.
- Flow force along an incline is F = mg sin(theta), where m is pallet mass and theta is lane angle.
- Storage capacity per lane is lane capacity = number of pallet positions deep x number of vertical levels.
- Safe operation depends on controlled speed, pallet condition, load stability, and correctly rated rack components.
Vocabulary
- Pallet live storage
- A gravity-fed rack system in which pallets roll through inclined lanes from a loading side to a picking side.
- FIFO
- First in, first out is an inventory method where the earliest loaded pallet is the first one removed.
- Lane pitch
- Lane pitch is the downward slope of a pallet flow lane that creates the gravity force needed for movement.
- Brake roller
- A brake roller is a speed-control device that slows pallets as they travel down a gravity flow lane.
- Pallet stop
- A pallet stop is a barrier at the picking end that holds the front pallet safely in position until it is removed.
Common Mistakes to Avoid
- Using pallets that are damaged or the wrong type, because broken boards or incompatible runners can jam on rollers and create unsafe loads.
- Making the lane pitch too steep, because excessive slope can cause pallets to accelerate too fast and strike the front stop with high force.
- Ignoring load weight variation, because a brake setting or roller layout that works for a light pallet may not control a heavy pallet safely.
- Treating live storage as random access storage, because deep flow lanes are designed for product lanes and FIFO movement rather than picking any pallet at any time.
Practice Questions
- 1 A live storage lane is 12 m long and has a vertical drop of 0.36 m from loading end to picking end. Calculate the slope as a decimal and as a percent.
- 2 A rack has 8 flow lanes on each level, 4 pallet positions per lane, and 3 vertical levels. How many pallet positions does the rack provide?
- 3 Explain why pallet live storage is better suited to high-volume products with regular turnover than to products that need frequent random access to individual pallets.