Overview
Double deep pallet racking is an industrial storage system that doubles storage density by arranging pallets two-deep along each aisle. This semi-automated solution bridges the gap between selective racking and fully automated systems like AS/RS. Unlike push-back or drive-in racking, double deep systems maintain partial selectivity - the front pallet can be accessed without moving the rear one. The design typically features heavy-duty steel frames with twin upright supports to handle the extended reach requirements.
Structure and Working Principle
The system consists of upright frames, double-deep beams, and wire decking or pallet supports. The upright frames are spaced to create storage lanes exactly two pallets deep. Special reach trucks with extended forks (up to 3m) are required to access the second pallet position. When loading, operators place the first pallet directly against the rear stop. The second pallet is then positioned in front of it. Retrieval requires the forklift to extend past the front pallet to lift the rear load, then carefully withdraw both the load and the extended forks.
Key Features
Double deep racking offers 20-30% higher storage density compared to selective systems while maintaining better accessibility than drive-in alternatives. The design typically supports loads of 1,000-3,000 kg per pallet position. Key advantages include reduced aisle space (narrower aisles than selective systems), better space utilization than push-back racking for medium-turn inventory, and lower initial investment than automated systems. The galvanized steel construction provides durability for industrial environments.
Application Areas
This system is ideal for warehouses storing large quantities of medium-turnover SKUs. Common applications include food and beverage distribution, retail DCs, and manufacturing raw material storage. It's particularly effective when handling 4-12 SKUs that represent the bulk of inventory volume. The system works best in facilities with ceiling heights of 8-12 meters and where 60-70% of inventory turns within 90 days. Not recommended for very slow-moving or extremely fast-rotating products.
Maintenance and Precautions
Regular inspections should check for beam deflection, upright alignment, and connection bolt tightness. Damaged components must be replaced immediately as the system relies on precise spacing for forklift operations. Safety precautions include proper employee training on reach truck operations, clear floor markings for narrow aisles, and installation of protective guards on rack ends. Warehouse managers should maintain at least 10% empty positions to facilitate stock rotation and prevent double-stacking errors.
B2B Procurement Guide
When sourcing double deep racking, specify load capacity per level, required seismic ratings, and beam elevation increments. Lead times typically range 4-8 weeks for custom configurations. Key procurement considerations include: compatibility with existing forklift fleet (may require new reach trucks), warehouse floor load capacity (minimum 5,000 kg/m² recommended), and future expansion needs. Top manufacturers include SSI Schaefer, Ridg-U-Rak, and Unarco. Request certified load test reports and seismic calculations for your region.
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