Case Study: Two workers were assigned to paint the inside of a steel tank. The entrant was painting with an airless spray gun and epoxy-based paint. The attendant sat on the top of the tank, positioning a 500-watt halogen lamp for light. The entrant nearly finished painting the tank, but when he began to paint the top, the nozzle of the spray gun hit the halogen lamp, breaking the seal and exposing the epoxy vapor to the tungsten filament inside. Halogen lamps work by heating this filament up to 4500° Fahrenheit. Upon contact with the now-exposed heated filament, the latent epoxy vapor caused an explosion. The entrant was able to exit the tank, but sustained second-degree and third-degree burns covering 40 percent of his body. He died in the hospital eight days later.
Key Takeaways: When working in a flammable atmosphere, it is not always obvious what can or will cause ignition. It is very important to ensure that all of your equipment is approved for use in flammable atmospheres, especially within a confined space. Furthermore, a ventilation system would have dispersed some of the fumes, bringing the concentration below ignition level. As a supervisor, you need to verify that a ventilation system is in place, and that all equipment is approved for use with the hazards that may exist in your team's work environment.