Sector·2 min read
Tire Storage Fire Safety
Tire storage is one of the toughest fire safety scenarios: tires filled with rubber, steel, and textile cord carry a very high fire load per unit volume, grow very fast, and give off thick, black, toxic smoke. The tire's geometry creates air pockets inside; these pockets feed the fire, hinder wetting with water, and cause re-ignition after suppression. Melting rubber forms pyrolysis oil, creating a flowing-fire risk. This article covers the real fire risks in tire storage, the difference between indoor and outdoor storage, the measures to take, and the recommended suppression systems (high-density sprinkler/ESFR, in-rack sprinkler, foam, monitor/deluge outdoors).
A-Pro Engineering
Tire storage is one of the toughest fire safety scenarios: tires filled with rubber, steel, and textile cord carry a very high fire load per unit volume, grow very fast, and give off thick, black, toxic smoke. The tire’s geometry creates internal air pockets — feeding the fire, hindering wetting, and creating re-ignition risk. This article covers the real risks, the indoor/outdoor difference, measures, and recommended suppression systems.
Risk: extremely high fire load + hidden pockets
- Rubber is petroleum-derived — very high heat, very fast growth,
- Thick, black, toxic smoke — hinders vision and response,
- Tire ring geometry creates internal air pockets — feeds the fire, blocks water,
- Melting rubber forms pyrolysis oil — flowing fire + re-ignition.
Risk: indoor vs outdoor difference
- Indoor/high-rack storage — standard density insufficient; high-density + in-rack sprinkler,
- Outdoor yard — sprinkler cannot be applied; separation + monitor + adequate water,
- Very high water demand in both.
Measure: limiting fire load and spread
- Pile/rack size control + compartmentation + spacing between piles,
- Keep ignition sources away (hot work, electrical) + regular housekeeping,
- High-density + in-rack sprinkler and strong water supply in high-rack indoor storage.
Measure: foam and re-ignition control
- Foam for melting rubber/oil — blankets the surface, cuts oxygen,
- Prolonged cooling + breaking up the pile after response,
- Thermal monitoring (thermal camera if needed) to track hot spots.
Recommended suppression and detection systems
| Area / condition | Recommended system |
|---|---|
| Indoor / high-rack storage | High-density sprinkler / ESFR + in-rack |
| Melting rubber / oil | Foam addition |
| Outdoor storage | Monitor (fixed/portable) + foam + water infrastructure |
| General warehouse area | Wet sprinkler |
| Electrical, control room | Clean-agent gas |
| Early detection | Smoke/heat + thermal camera outdoors |
We covered ESFR in our ESFR article and foam in our foam article.
Summary
Tire storage fire safety manages an extreme fire load and hidden pockets: protecting indoor/high-rack storage with high-density + in-rack sprinkler, melting rubber with foam, the outdoor yard with separation + monitors, and controlling re-ignition with prolonged cooling + thermal monitoring. All are based on NFPA 13 (tire storage) + NFPA 11/2001 + EN 12845/BYKHY. For a related risk see our plastics/rubber manufacturing and factory/industrial facility articles. At A-Pro Engineering we design high-density sprinkler/ESFR, foam, and monitor systems for tire warehouses in an integrated way; contact us for your project.
This content is for information purposes. Binding design must be done on a project basis based on storage type (indoor/outdoor), pile height, tire type, and the actual conditions of the facility, together with NFPA 13, NFPA 11/2001, EN 12845, and the current edition of BYKHY.
© 2027 A-Pro Mühendislik. This is original technical content produced by A-Pro Engineering; all rights reserved. Copying, reproducing or republishing it in whole or in part without attribution and permission is prohibited.
Frequently asked questions
Why is tire storage such a dangerous fire risk?+
Tires contain rubber, steel cord, and textile cord; rubber is petroleum-derived and gives off very high heat per unit mass. A tire fire grows extremely fast, reaches very high temperatures, and produces thick, black, toxic smoke. The tire's ring geometry creates air pockets inside; these pockets hold oxygen that feeds the fire and prevent suppression water from reaching the burning surface. Melting rubber turns into pyrolysis oil, creating a flowing fire. These three factors — high fire load, hidden air pockets, and flowing oil — make a tire fire one of the hardest to extinguish.
How does indoor tire storage differ from outdoor?+
For indoor protection (enclosed warehouses and high-rack storage), sprinklers are essential; but because of a tire fire's high heat release, standard density is not enough — high-density sprinklers and often in-rack sprinklers are needed. Pile height, rack type, and tire arrangement directly determine the design. For outdoor (open-yard) storage, sprinklers cannot be applied, so the approach differs: adequate spacing (separation) between piles, limiting pile size, perimeter access roads, and water-foam response via fixed/portable monitors come to the fore. In both cases the water demand is very high and an adequate water supply is critical.
Why is foam used and how is re-ignition prevented?+
In a tire fire, melting rubber forms an oil film and flowing oil on the surface; water alone struggles to wet and smother this oil. Foam blankets the burning surface, cuts oxygen, and suppresses re-vaporization; that is why foam addition is valuable in tire and rubber fires. Re-ignition risk is high because smoldering continues in the tire's internal pockets; after response, prolonged cooling, breaking up the pile, and thermal monitoring (thermal camera if needed) to track hot spots are required. Inadequate cooling can bring the flame back hours later.
What measures are taken in a tire warehouse?+
The basic measure is to limit fire load and spread: controlling pile/rack sizes, compartmentation, spacing between piles, and keeping ignition sources (hot work, electrical, smoking) away. In high-rack indoor storage, high-density sprinklers + in-rack sprinklers are designed and an adequate water supply (tank + pump) is provided. Outdoors, separation distances, a perimeter access road, and monitor lines are set up. Early detection (smoke/heat, thermal camera if needed) catches the fire before it grows. Regular housekeeping and stacking discipline reduce hidden accumulation and spread paths.
Which suppression systems are recommended in tire storage?+
By area: high-density sprinkler and/or ESFR + in-rack sprinkler for high-rack indoor storage; foam addition (for melting rubber/oil); fixed/portable monitors + foam and adequate water infrastructure for outdoor storage; wet sprinkler for general warehouse areas; clean-agent gas for electrical and control rooms. For early detection, smoke/heat detectors and a thermal camera outdoors are considered. High water flow and a strong water supply are the backbone of tire-storage design. The right set is designed in an integrated way per indoor/outdoor storage, pile height, and site conditions.
Which standards govern tire storage?+
NFPA 13 contains specific design criteria for rubber tire storage (density, in-rack sprinklers, pile height) and is the primary reference; it is applied together with EN 12845 sprinkler design. NFPA 11 for foam and NFPA 2001 for clean-agent suppression are the basis. For outdoor storage, separation distances and water-supply approaches are considered. In Türkiye, design is based on these standards together with BYKHY. For related topics see our plastics/rubber manufacturing and factory/industrial facility articles.
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