Ultra-High-Density 3PL Storage Inside a Low-Ceiling Building
Top-Tier 3PL Operator, Hong Kong
Results at a Glance
The Challenge
Industrial property in dense urban logistics hubs — Hong Kong, Singapore, Johannesburg, Cape Town — is some of the most expensive in the world. 3PLs in those markets often inherit short, low-ceiling buildings that were never designed for modern e-commerce. They cannot just "go vertical" the way a greenfield European DC can: the building is what it is, and the rent goes up every year. This 3PL faced exactly that problem: a 4.3 m clear-height warehouse, multi-tenant flow, fashion and consumer-goods inventory with classic Pareto distribution, and rising customer expectations on order accuracy and same-day cut-offs. Standard goods-to-person robots designed for 6–9 m buildings were too tall. On top of that, the project went live in early 2020 — in the middle of pandemic travel restrictions — meaning the system had to be commissioned, tuned and put into production remotely.
The Solution
A purpose-engineered double-deep ACR system was retrofitted inside the existing low-ceiling building, with hot/cold zone management to optimise pick rates for the highest-velocity SKUs. Double-deep case-handling ACRs (4.2 m) were designed specifically for low-ceiling buildings — every centimetre engineered to fit under the 4.3 m clear height. Two-row parallel double-deep shelving stores cases two-deep, doubling the SKU count per aisle. "Swap-on-robot" tray technology lets the robot store goods on its own tray and access second-row items directly — eliminating the slow swap-on-shelving step that kills throughput in conventional double-deep systems. Hot/cold location management automatically migrates fast-moving SKUs into the hottest pick locations. Goods-to-person picking workstations replace aisle walking entirely. Commissioning, tuning and go-live were executed remotely from March to May 2020 during global travel restrictions.
Systems Used
- Double-deep case-handling ACRs (4.2 m)
- Swap-on-robot tray technology
- Hot/cold location management
- Goods-to-person picking workstations
- Integrated WMS/WCS
Why This Matters for South African Operations
South African 3PLs operating in the Gauteng and Cape Town corridors face the same fundamental constraint as Hong Kong: industrial buildings are expensive, the ceilings you have are the ceilings you get, and the only way to grow is to extract more out of the building you are already paying for. This case proves that a low-ceiling warehouse is not a dead end — with double-deep ACRs engineered specifically for short buildings, swap-on-robot tray technology, hot/cold zone management and a remote-deployment playbook, an existing facility can be converted into an ultra-high-density goods-to-person operation without breaking the lease or re-roofing the building.
Partner Technology Case Study
This project was delivered using automation technology from Allied Automation's manufacturing partners. Allied Automation supplies, integrates and supports the same technology platforms across South Africa and Africa. The results and specifications shown are those of the original deployment.
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