Hydrogen dispersion and explosion

Roof venting effects

Under closed-roof conditions,  hydrogen  accumulated  beneath  the  ceiling  and  produced  monitored  peak  overpressures  of 7.96–119.92 kPa.

Roof venting reduced peak overpressure by 62.4–98.3% and positive impulse by 91.9–95.1%

Protective-barrier effects

After ignition, the with-barrier case showed a decrease in protected-side peak overpressure from 1.61 to 0.14 kPa. 

The positive impulse at this location decreased from 63.65 to 7.91 kPa⋅ms, corresponding to an 87.6% reduction.