These conclusions are based on the following considerations. The great majority of primary explosions in grain elevators occur in well-defined areas, which OSHA has designated priority areas. Reducing the risk of a primary explosion will consequently reduce the possibility of a secondary explosion. These well-defined areas are where the known potential ignition sources are concentrated. OSHA believes it has specified rigorous measures to control ignition sources in priority areas.
Requirements addressing the control of ignition sources include the following.
In Appendix A, OSHA has described the basic elements of an adequate housekeeping program. The employer must analyze the entire stock handling system to identify sources of dust and effective controls. The schedule is to give priority to areas with numerous ignition sources. The plan must address contingencies such as equipment breakdown. Provision must be made for access to enclosed mechanical systems.