3.4. Characteristics of explosion
The explosion test was conducted in the tube which was made following JIS Z 8818:2002 (Appendix 2). The dust
explosion pressure and pressure increase rate were measured with a pressure transducer. The ignition were
attempted with chemical energy, 10 kJ.
The pressure and pressure increasing rate of dust explosion in 30 L spherical vessel were measured. The
maximum pressure, Pmax, and Kst are obtained. Since rates of pressure rise vary inversely with vessel radius, the
cubic low constant for dust, Kst, is defined;
Here, V is the volume of vessel. Results are shown in Table 2, where dust concentration was 1500 g/m3 in the
maximum.