Page 423 - Advanced Mine Ventilation

392 Advanced Mine Ventilation

Figure 23.7 (A and B) Explosibility data for Pittsburgh (high-volatile bituminous) pulverized
coal dust in the 20 L chamber. From Cashdollar KL: Coal Dust Explosibility, J of Loss
Prevention, Processing and Industry; vol 9, No 1; 1996, pp. 65-76.
23.3.3 Preventing Ignition of MethaneeAir Mixtures

Besides the potential sources of ignition, such as spontaneous combustion and fric-
tional ignitions, the only other major source is a flame or an electrical spark. The
following is a list of preventative measures.
1. No open lights or smoking should be allowed in underground coal mines.
2. Mine safety lamps or approved battery-powered cap lights should be used for lighting. Mine
safety lamps are almost obsolete in the United States.