Double Deep Racking[2]
Overview
Double deep pallet racking is a warehouse storage system designed to maximize space utilization by placing two pallets in depth within each row. Unlike single-deep racking, this configuration reduces the number of aisles required, increasing storage density by approximately 40%. This system is particularly suited for facilities storing large quantities of similar SKUs with lower turnover rates. It represents a middle ground between selective racking and higher-density systems like drive-in racking, offering better selectivity than the latter while maintaining significant space savings.
Structure and Working Principle
The system consists of upright frames, double-deep beams, and wire decking or pallet supports. The frames are typically 2–3 times deeper than standard selective racking, with load beams designed to support two pallets in sequence. Operation requires specialized reach trucks with extended forks that can access the second pallet position. These forklifts typically have pantograph mechanisms that allow the forks to extend beyond the first pallet while maintaining stability. The first pallet remains directly accessible, while the second requires moving the first pallet temporarily.
Key Features
Space efficiency is the primary advantage, with aisle widths reduced to 2.7–3.5 meters compared to 3.5–4 meters for selective racking. This configuration typically provides 5–7 picking faces per aisle, balancing density with accessibility. Load capacities range from 1,000–3,000 kg per level, with the rear position often rated for slightly less weight. The system supports standard pallet sizes (48×40 inches in North America, 1200×1000 mm in Europe) and can be configured for various building heights, commonly up to 12 meters.
Application Areas
Ideal for wholesale distribution centers, food storage facilities, and manufacturing plants with bulk storage needs. Particularly effective for: 1) operations with many pallets of identical products, 2) environments where space costs outweigh equipment costs, and 3) medium-turn inventory (1–5 moves per month per SKU). Common industry applications include beverage distribution (where products are often shipped in full pallet quantities), automotive parts storage, and seasonal product warehousing. Not recommended for operations requiring strict FIFO inventory rotation or frequent access to all pallets.
Maintenance and Precautions
Regular inspections should check for: beam deflection (maximum 1/180 of span), upright alignment (vertical tolerance ±10 mm per 3 m height), and connector tightness. Impact protection is critical - install column guards at aisle ends and corner protectors at turning points. Operational precautions include: never exceeding stated load capacities, ensuring pallets are undamaged and properly positioned, and maintaining clear aisle markings. Forklift operators require specific training for double-deep operations, including proper load handling when accessing rear pallets.
B2B Procurement Guide
When sourcing double deep racking, consider: 1) actual pallet dimensions and weights (provide worst-case samples), 2) floor flatness requirements (typically ±10 mm over 3 m), and 3) seismic zone ratings if applicable. Lead times range from 4–8 weeks for standard systems. Request third-party load testing certificates (e.g., FEM or RMI standards) and verify corrosion protection (powder coating or galvanization based on environment). For reference, a medium-sized warehouse project (5,000 pallet positions) typically costs $1–2.5 million including installation.
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