Fertilizer Plant: NFPA 400 Ammonium Nitrate, West TX 2013 and Turkish Plants

The large plants in Ceyhan, Yarımca and Bandırma supply most of Turkey's fertilizer output of roughly 6 million tonnes a year. Their core products are fertilizer-grade ammonium nitrate (FGAN), calcium ammonium nitrate with 27% nitrogen (CAN 27) and NPK compound fertilizers. The 2013 explosion at a fertilizer store in West, Texas killed 15 people; since then nobody on site should treat this material as “just another fertilizer”. NFPA 400 treats ammonium nitrate as a Class 2–3 oxidizer and mandates storage limits, separation from organic materials and fire protection.

Ammonium Nitrate (AN) Chemistry

• Formula: NH₄NO₃, 80 g/mol
• Decomposition: Begins at about 170 °C
• Explosion threshold: Can self-detonate at about 250 °C
• FGAN: Fertilizer-grade AN
• TGAN: Technical-grade AN, used to make explosives

NFPA 400 Limits

• Class 3 oxidizer: Pure AN on its own falls into this class
• Maximum pile: 2,700 t
• Separation: 15 m between piles
• Separation from organics: No oil, fuel or wood in the same area
• Packaging: 50 kg polyethylene (PE) bags

Fire Protection

• Sprinklers: 20.4 L/min/m² density in oxidizer storage
• Copious water: The aim is to cool and stop decomposition, not to smother
• Dry chemical: Limited effect; does not stop decomposition
• Foam: Ineffective; AN supplies its own oxygen, so smothering does not work
• Floor: Non-absorbent concrete is mandatory

Major Incidents

• West (Texas) 2013: 15 dead, 270 t FGAN
• Beirut 2020: 220 dead, 2,750 t AN
• Oppau 1921: 561 dead, 4,500 t
• Toulouse AZF 2001: 31 dead
• Tianjin 2015: 173 dead, mixed chemical warehouse

Plants in Turkey

• Ceyhan plant: 700,000 t AN capacity
• Yarımca plant: 1.4 Mt annual output
• Bandırma plant: 700,000 t
• Samsun plant: Mainly NPK compound fertilizers
• Port of Mersin: Main entry point for AN imports

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