Effective fire prevention in data centers requires a coordinated approach that adapts to evolving hazards such as high-power densities, lithium-ion UPS systems and operational changes. Success depends on early and frequent design integration, adherence to codes and the selection of detection and suppression technologies suited to specific risks. Early warning systems – typically air-aspirating smoke detectors – are vital in environments with high airflow and rapid smoke dispersion. Lithium-ion batteries pose challenges with thermal runaway, ventilation and gas detection, necessitating informed system choices. Infrastructure and layout decisions, including interior structures and hot aisle containment areas, demand flexible sprinkler system approaches. Overall, proactive, integrated fire protection is essential for safety, operational continuity and compliance as data centers expand in size and complexity.
Designing for Change
Change is constant in data center projects and operations. System density, client occupancy and spatial configurations are continually evolving, requiring fire protection strategies that can accommodate these shifts. A design philosophy built on flexibility ensures that protection systems remain effective despite operational changes. For example, specifying Extra Hazard sprinkler density can accommodate a potential switch to lithium-ion UPS systems, while matching overhead coverage ensures hot-aisle containment locations remain protected regardless of quantity or location.
Air-aspirating smoke detection systems are widely used in data centers due to their sensitivity and ability to operate effectively in high-airflow environments. To minimize false alarms and ensure these systems respond appropriately, they should be baselined during commissioning. Seasonal variations, such as wildfire smoke, should also be monitored to protect equipment.
Lithium-Ion UPS Systems
The use of lithium-ion UPS systems has expanded significantly across data center facilities in recent years, appearing in data halls, adjacent electrical spaces, outdoor containers or all three locations simultaneously, with increasing energy densities. It is important to note, however, that the battery density of these systems is generally significantly lower than what you might see in a grid-scale system.
The smaller battery sizes typical of data center UPS installations, coupled with the relatively large room volumes in which they’re located, often alleviate explosion concerns under likely thermal runaway scenarios. In many cases, explosion control can be achieved with modest or even zero ventilation rates, maintaining likely explosive gas concentrations below 25% of the lower flammability limit. That said, each configuration should be analyzed individually to ensure appropriate hazard mitigation measures are in place.
Future-Proofing Fire Protection
As data centers continue to grow in scale and complexity, fire protection strategies must evolve alongside them. The integration of lithium-ion UPS systems, increasing power densities and frequent layout modifications demand a design philosophy built on flexibility and foresight. By implementing Extra Hazard sprinkler densities, properly commissioned air-aspirating detection systems and thoughtful ventilation strategies, facility operators can accommodate inevitable changes while maintaining robust protection. While the relatively lower battery densities and larger room volumes in data center applications often mitigate explosion risks compared to grid-scale installations, careful analysis of each configuration remains essential. Ultimately, successful fire protection in modern data centers requires not just compliance with current codes, but a forward-thinking approach that anticipates future modifications and emerging technologies, ensuring that safety systems remain effective throughout the facility’s lifecycle, regardless of how operational needs evolve.
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About the Author
Alison Wakelin, Market Leader South, Fire Protection Specialist, Jensen Hughes
Alison is a Market Leader for Jensen Hughes’ Southeast region. She has been the Fire Protection Designer of Record on more than 200 Federal projects for the DoD, and her specialized completed projects include: barracks, child development centers, military working dog facilities, hospitals, exchanges, elementary schools and aircraft hangars. This work includes design of fire alarm, sprinkler, standpipe and fire pump systems, as well as analysis of the overall life safety approach for the buildings. Her work also focuses on Data Centers – the use of Lithium Ion (Li-ion) battery UPS systems, and sprinkler and VESDA system design. She has performed design work for the Veteran’s Administration on hospital and clinic projects, while her commercial work includes analysis of high hazard storage, grain and paper dust and flammable liquids projects.
