There must be certain conditions for the formation of combustion and explosion. The following conditions meet in time and space to produce a fire or explosion:
1. a combustion agent such as hydrogen, gasoline, etc.;
2. An oxidant such as oxygen, air, etc.;
3. Ignition sources such as open flames, sparks, electric arcs, hot surfaces, etc.
The above conditions are referred to as the three elements that form combustion and explosion. Measures are taken in the project to prevent the simultaneous presence of three elements to prevent fire and explosion hazards.