Shuttle ASRS is the modern e-commerce warehouse standard: 15 to 30 m high, with a horizontal shuttle robot at every level and fully automated tote handling. FM Global DS 8-34 applies its strictest requirements to this configuration: in-rack sprinklers at every level, aspirating detection and robot emergency stop.
Shuttle ASRS Configuration
- A vertically enclosed steel structure
- One or two shuttles at each of 10 to 50 levels
- Automated tote and carton placement
- Heights of 15 to 30 m, against 4 to 12 m for mini-load
- Narrow aisles of 1 to 1.5 m, against around 3 m in conventional racking
Sprinkler Design
- Ceiling: ESFR K360 or K480 required
- Horizontal in-rack sprinklers at every level
- K11.2 in-rack heads, spaced according to rack depth
- Open-top combustible containers: the hardest case, requiring every level plus transverse coverage
- Closed-top metal containers: a level may be omitted
Aspirating and Linear Heat Detection
- Aspirating smoke detection is the most effective option in a narrow aisle
- Sampling points at two or three positions on each level
- Linear heat detection along the rack rows as a second layer
- Multi-level alarms: Alert, Action, Fire 1, Fire 2
- The robot emergency stop is triggered at the Action level
Robot Emergency Stop and Bypass
- On detection, the controller moves every shuttle and crane to a safe position
- A bypass allows the fire service to move robots out of the fire zone on arrival
- A mechanical interlock prevents a shuttle moving while it sits beneath the fire
- Insurers expect the warehouse management system and the fire alarm panel to be integrated
Quick Checklist
- Enclosed steel shuttle structure identified
- Ceiling ESFR K360 or K480
- In-rack sprinklers at every level for open-top containers
- Aspirating detection with linear heat detection as backup
- Robot emergency stop, bypass and interlock defined
- Warehouse control system integrated with the fire alarm panel
- Supplier package verified as FM compliant
Frequently Asked Questions
Why does shuttle ASRS require in-rack sprinklers at every level?
Because the structure is vertically enclosed and 15 to 30 m tall, ceiling sprinklers cannot get water down into the array. Each level effectively shields the one below, so water must be introduced at every level for the fire to be controlled inside the rack rather than allowed to climb the structure.
Why is aspirating detection preferred in an automated aisle?
The aisles are unoccupied and narrow, so nobody is present to notice a developing fire and the geometry restricts smoke movement. Aspirating detection samples air continuously at multiple points on every level, giving warning long before ceiling sprinklers would operate at that height.
What happens to the robots when a fire is detected?
At the Action alarm level the controller moves every shuttle and crane to a defined safe position, and a mechanical interlock prevents movement of any unit sitting beneath the fire. A bypass function lets the fire service move machines clear of the fire zone on arrival, so they do not obstruct access.
Does container type change the sprinkler requirement?
Yes, significantly. Open-top combustible containers expose their contents directly to the flue and represent the hardest case, requiring in-rack sprinklers at every level plus transverse coverage. Closed-top metal containers slow fire development enough that a level can sometimes be omitted, subject to the DS 8-34 tables.
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