Warehouse Storage Systems

Pallet Storage and Retrieval Systems

• Pallet storage systems focus on standard selection, storage density, current inventory, and item turnover.
• Factors affecting pallet retrieval systems include material handling productivity and capital investment priorities.

Pallet Storage System Types

• Block Stacking: Pallets stacked on the warehouse floor, limited to two to ten pallets deep, considering safety and load restrictions.

• Stacking Frames: Can be attached to wooden pallets and allow for multiple unit stacking; they can be disassembled for space savings.

• Single-Deep Selective Pallet Rack:

  • Advantages include quick access to each unit and high space utilization.
  • Disadvantages involve needing larger aisles for access.

• Double-Deep Rack:

  • Holds two pallets deep, saving aisle space, but can create a "hive phenomenon" reducing usable space.

• Drive-In Rack:

  • Supports multiple pallets high and deep; allows for forklift entry, creating multi-level storage.
  • Safety concerns include slower operation and potential hive phenomenon.

• Drive-Thru Rack:

  • Allows for entry and exit from both ends, suitable for FIFO operations.

• Pallet Flow Rack:

  • Uses roller conveyor systems to move pallets, increasing throughput but being more expensive.

• Push-Back Rack:

  • Operates on a FIFO system where pallets push back based on weight, eliminating vertical hive issues.

• Mobile Pallet Rack:

  • Features wheels or tracks allowing movement to optimize storage density.
  • Overall, effective but less efficient in retrieval speed.

Factors for Pallet Storage System Selection

• Choose storage systems tailored to specific item characteristics for optimal organization and efficiency.
• Costs, labor, and specific operational needs should influence the decision-making process.

Pallet Retrieval Systems

• Walker Stacker:

  • Operated by walking behind the unit; suitable for low throughput and short distances.

• Counterbalance Lift Truck:

  • Provides stability with a weight balance; versatile but requires wider aisles.

• Straddle Truck:

  • Utilizes a straddle arm for stability while accessing pallets, requiring foundational support.

• Reach Truck:

  • Allows better reach due to reduced height; efficient for narrow aisles.

• Side Loader:

  • Enables side loading and unloading, reducing the need for turning space.

• Turret Truck:

  • Operates in narrow aisles without needing to turn, enhancing speed and safety.

• Hybrid Truck:

  • Combines vertical and horizontal movements for greater flexibility.

Automated Storage and Retrieval Systems (AS/RS)

• AS/RS uses guided tracks and automated vehicles for efficient storage and retrieval.
• Suited for high throughput and variability in load types; can operate at significant heights.

Operation Modes of AS/RS

• Single command operation moves items to empty storage; reverse operations manage retrieval.
• Dual command operation facilitates simultaneous loading and retrieving, optimizing workflow.

Additional Considerations

• Evaluate storage depth requirements and the number of aisles based on inventory volume.
• Automatic storage needs may vary depending on throughput demands and warehouse layout.

This quiz assesses your knowledge of warehouse storage systems, including different types of pallet racks, storage density, and material handling. Learn about block stacking, stacking frames, and various pallet rack systems. Test your understanding of warehouse management and optimization techniques.