Fire Safety Science Digital Archive

The maximum experimental safe gaps in an 8 l volume vessel were measured for a range of flange breadths in a closed vessel, and a vessel fitted with the flame arresters, with hydrogen/air flammable mixtures. The insertion of the arrester increased the maximum experimental safe gaps and reduced considerably the maximum explosion pressures. The reduction in the maximum explosion pressure makes possible the manufacture of safe electrical equipment for hydrogen/air flammable mixtures, where the stresses imposed by high rates of burning make the design of such equipment difficult.