Turkey has 30,000 km of dual carriageway fed by 200+ asphalt plants. The rotary dryer brings aggregate to 150 C and bitumen sits at 140-180 C. Burners run LPG, diesel or natural gas. NFPA 87 covers asphalt fluid heaters, silo venting, rotary-dryer deflagration and fuel tank setback.
Plant Main Units
- Rotary dryer: 3-5 m dia x 10-15 m long
- Burner: 10-40 MW
- Hot aggregate silo: 150-180 C
- Bitumen tank: 50-200 m3, 160 C
- Baghouse: Dust filter
Bitumen Hazard
- Flash point: 218-280 C (Class IIIB)
- Storage temp: 160 C
- Fire temp: 260 C ignite
- Tank foam: 6.5 L/min/m2
- Heater coil: Hot oil safer
Rotary Dryer Risk
- CO alarm: 50 ppm
- Deflagration vent: NFPA 68
- Flame scanner: UV/IR
- Purge: 5 volume changes
- BMS: NFPA 85 burner management
Baghouse Fire
- Filter bag: PTFE 240 C max
- Aramid (Nomex): 200 C
- Sprinkler: Baghouse internal dry
- Spark detector: IR
- Inlet gate: Quick isolation
Turkey Operators
- KGM: 30,000 km asphalt network
- Central Anatolia plants: 180-240 t/h
- Ankara metropolitan: 6 plants
- 2018 Batman plant fire: Bitumen tank
- Superpave TSA: TS EN 12697
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Sources & Further Reading
NFPA 87, NFPA 85, NFPA 68, TS EN 12697, KGM Karayollari. NFPA 87 Fluid Heaters.