Two workers were killed as a result of an explosion and fire at a service station. The explosion resulted from the ignition of vaporized flammable liquid in the garage’s basement.
The incident occurred while the workers were installing a sump pump to remove ground water that had accumulated on the basement floor.
Investigations suggest that flammable liquid had accumulated in the basement over a period of time, either from petroleum spillage inside the garage, or petroleum-contaminated soil adjacent to the basement floor.
The spark that ignited the vaporized flammable liquid may have originated from either the sump pump that was being installed, or a water pump already located in the basement area.
|a)||Use only electrical equipment that is designed to be explosion-proof.|
|b)||Install an explosion-proof ventilation system to keep vaporized flammable liquid well below the explosion level.|
|c)||Install a continuous-monitoring device to alert workers of the presence of flammable vapours.|