Abstract: In order to study the combustion characteristics of field combined soft oil tank under different radiation intensities, the combustion experiments of soft oil tank samples were carried out by cone calorimeter. Three typical heat radiation intensities of 25, 35 kW/m2 and 50 kW/m2 were selected, and the data of ignition time, heat release rate, specific extinction area, smoke generation rate and flame shape were obtained. The results show that when the thermal radiation intensity is 50 kW/m2, the ignition time is 38% and 53% that of 25 and 35 kW/m2, respectively; The maximum heat release rate is 1.4 times and 1.7 times that of 25 and 35 kW/m2 respectively, and the time to reach the peak is reduced by 15% and 40% respectively; The maximum flue gas generation rate of combustion is 1.4 and 1.8 times that of 25 and 35 kW/m2 respectively; After combustion, the mass of remaining carbon layer is reduced by 1/3 and 1/2 respectively.

Key words: soft oil tank, cone calorimeter, thermal radiation, combustion characteristic