Isolate or limit free-flowing materials

See Hazard – Flammable or explosive atmosphere; Control measure – Isolate gases, liquids and other flowing materials.

In addition, the key control measure in this particular environment is to isolate the flow of the particular material into the space. In industrial-type confined spaces such as vats and silos there may be the option of shutting down the flow of materials into the space. In other situations, this may not be possible, but personnel may find they can remove the product from the space in question and eliminate the actual hazard.

Incident commanders should be aware that risks associated with free-flowing materials can include crusting of the upper surface, bridging of material and machinery, for example, a screw conveyor.