Study of fire size estimation for railway cars with ISO 9705 test

초록

The fire size, representing heat release rate, of railway car is core decision factors of fire safety countermeasures for railway tunnels. To estimate the fire size for types of railway cars, three cases of interior fire tests were conducted within ISO 9705 room under well ventilated condition. The standard 170mm square sand burner using propane gas was located under the seat of the train at the corner of the room. The output of the burner was controlled in a stairway steps wherein 75kW is maintained for 2 minutes, 150kW for 8 minutes and thereafter increased by 50kW for additional every 2 minutes. That was same as the standard ignition output of EN 45545-1 to 10 minute. Unsaturated polyester based GRP wall, PVC floor coverings and seat cushion with urethane foam were installed for first and third tests, and Phenol based GRP wall, fire retardant rubber floor coverings and neoprene foam seat cushion with anti-flame mesh were tested for second test. Flashover times for the first and third tests were about 3 minute while it was 13 minute for second test. The magnitudes of the slope after flashover to extinguishment for three different heat release rate curves, flaming area based fire size estimation and numerical analysis with the FDS ver. 5.4 will be discussed with this ISO 9705 room fire test results.