DESIGN GUIDELINES FOR DOUBLE-DEEP PALLET RACKS

Double-deep Pallet Rack Storage systems are SPR installed two racks deep that are operated in medium aisles with trucks that can reach double pallet depths.

Double-deep Pallet Racking Storage systems results in Last-In First-Out (LIFO) access, 50% of goods are behind pallets when storage locations are at full capacity.

Double-deep Pallet Racks are most suitable for:

• Medium volumes (up to 3000 pallets).
• SKUs in lots of two.
• Medium land cost.

Advantages

• Medium to low storage system.
• Floor level is not critical (front loaded)

Disadvantages

• Loss of storage locations as only same SKU can be stored in front storage positions. Recommended storage loss allowance 15-20%.
• LIFO inventory management.
• Limited storage height (10m).
• Special trucks required.
• Poor visibility of rear upper storage levels.
• Reduced through-put rates when compared with Reach Trucks.

DOUBLE-DEEP TRUCKS

• Aisle widths – 3.0 to 3.5m (medium aisles)
• Storage area – 55%
• Operating aisle area – 45%
• Through-put rate – 12-18 pph
• Lift height – up to 9.5m
• (Cubic capacity is based on pallet height and available clear storage height).

SUMMARY
Double-deep storage systems are medium cost when building, racks and trucks are taken into consideration. However, inventory products and quantities (PQ) and storage location loss must be considered.