Sector·2 min read
Automotive Factory Fire Safety
Automotive factories bring different high-risk processes together across vast production areas: the paint shop, with solvent-based paint, spray booths, and curing ovens, is the facility's highest fire risk; press lines have hydraulic oil mist, welding and body lines have sparks and hot work, assembly lines have dense cabling and electrical equipment, and electric-vehicle (EV) production adds lithium-ion battery risk. To these are added oil/lubricant and high-rack parts storage. This article covers the real fire risks in automotive factories, the measures to take, and the recommended suppression systems (water spray/CO2/foam in paint booths and ovens, spark detection in paint ducts, ESFR in parts storage, clean-agent gas in electrical/EV areas).
A-Pro Engineering
Automotive factories bring different high-risk processes together across vast production areas: the paint shop (solvent paint, spray booths, curing ovens) is the highest risk, the press line has hydraulic oil mist, the welding/body line has sparks, EV battery production has lithium-ion risk, and there is high-rack parts storage. This article covers the real risks, measures, and recommended suppression systems.
Risk: paint shop — the highest fire risk
- Solvent paint, thinner, primer — flammable liquid and vapor,
- Paint mist (overspray) — explosive atmosphere in the booth,
- Drying/curing oven — high temperature,
- Residue in paint ducts — hidden, rapid spread path.
The paint shop is protected as a separate compartment. We covered paint booth protection in our paint booths article.
Risk: press, welding, and body
- Press — a hydraulic hose leak ignites as pressurised oil mist (fast, severe),
- Welding/cutting/grinding — continuous sparks and hot work,
- Robotic assembly — dense cabling, panels, drives (electrical fire).
Risk: electric-vehicle (EV) battery production
- Lithium-ion cell/module — thermal runaway in production, testing, and storage,
- A single cell fault triggers the neighbor → spreading, re-igniting fire,
- Battery assembly/test/storage need a separate compartment + early detection + cooling.
We covered lithium-ion behavior in our battery article.
Measures and recommended suppression systems
| Section | Recommended system |
|---|---|
| Paint booth, curing oven | Water spray / CO2 / foam + spark detection in paint ducts |
| Hydraulic press unit | Oil containment + local suppression |
| High-rack parts storage | ESFR / in-rack sprinkler |
| General production hall | Wet sprinkler |
| Oil / flammable-liquid area | Foam addition |
| Electrical panel, control room, EV battery | Clean-agent gas + early detection |
We covered foam in our foam article and ESFR in our ESFR article.
Summary
Automotive factory fire safety is sectioned by process: protecting the paint shop with water spray/CO2/foam + spark detection and compartmentation, press/hydraulics with oil containment + local suppression, the parts warehouse with ESFR, and the electrical/EV battery area with clean-agent gas + early detection. All are based on NFPA 33/13/11/2001/30 + EN 12845/BYKHY. For the general approach see our factory/industrial facility article. At A-Pro Engineering we design paint booth protection, spark detection, ESFR, foam, and clean-agent suppression for automotive factories 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 each process section, fire load, EV battery presence, and actual facility conditions, together with NFPA 33, NFPA 13/11/2001/30, 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
Where is the biggest fire risk in an automotive factory?+
The biggest fire risk is the paint shop. Solvent-based paints, thinner, and primer form flammable liquid and vapor; during spraying in booths, paint mist (overspray) stays suspended in the air and can create an explosive atmosphere. Drying and curing ovens generate high temperature; paint residue building up in booths and exhaust ducts ignites easily and carries flame fast. Paint ducts are a hidden spread path that can carry a fire from one booth to another part of the facility. So the paint shop is protected as a separate compartment with its own suppression and spark detection systems. We covered paint booth protection in a separate article.
What risks exist on press, welding, and body lines?+
Press lines have high-pressure hydraulic systems; a hose burst or leak sprays oil as a pressurised mist and, if it reaches a hot surface, ignites easily — a hydraulic oil fire is fast and severe. Body operations such as welding, cutting, and grinding continuously generate sparks and hot work; nearby flammable material or oil build-up can ignite. Robotic assembly lines carry an electrical fire risk with dense cabling, electrical panels, and drives. For these sections, oil containment and local suppression at hydraulic units, hot-work procedures, and regular housekeeping are essential.
How does electric-vehicle (EV) production change the fire risk?+
EV production adds lithium-ion battery risk to the facility. Battery cells and modules carry thermal runaway risk during production, testing, and storage; a single cell fault can trigger neighboring cells, leading to a spreading fire that is hard to extinguish and can re-ignite. Battery assembly and storage areas should be compartmented separately, equipped with early detection (gas/smoke and thermal monitoring), and a response based on cooling with plenty of water should be planned. Battery test areas are especially high-risk. We covered lithium-ion fire behavior in a separate article; facilities producing EVs must incorporate this risk into the design.
How are the parts warehouse and general production area protected?+
Automotive factories have very large open production areas and high-rack parts/material warehouses; plastic parts, rubber, packaging, and lubricant oil form a high fire load. In high-rack storage, standard ceiling sprinklers alone are not enough; ESFR or in-rack sprinklers are used to cut flame rising within the rack. Wide production halls are protected with wet sprinklers; foam addition is considered in zones with oil and flammable liquid. In large open volumes, early detection and compartmentation are critical to prevent the fire spreading to the whole facility.
Which suppression systems are recommended in an automotive factory?+
By section: water spray/CO2/foam for paint booths and curing ovens and spark detection-extinguishing in paint ducts; oil containment + local suppression for hydraulic press units; ESFR/in-rack sprinkler for high-rack parts storage; wet sprinkler for general production halls; foam addition for oil/flammable-liquid areas; clean-agent gas + early detection for electrical panels, control rooms, and EV battery areas. The right set is evaluated separately per each process's character and designed in an integrated way.
Which standards govern automotive factories?+
NFPA 33 (Spray Application Using Flammable or Combustible Materials) for paint booths and spray applications, NFPA 13/EN 12845 for high-rack storage, NFPA 11 for foam, and NFPA 2001 for clean-agent suppression are the basis. For paint ducts and dust/mist lines, spark detection and relevant explosion protection approaches are considered; NFPA 30 applies for hydraulics and flammable liquids. Battery fire approaches are considered for EV battery areas. In Türkiye, design is based on these standards together with BYKHY. For related topics see our paint booth and factory/industrial facility articles.
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