This article presents a numerical study of the consequences of an hydrogen release from a pressure swing adsorption installation operating at 30 barg. The simulations are performed using FLACS/Hydrogen from GexCon. The impact of obstruction, partial confinement, leak orientation and wind on the explosive cloud formation (size and explosive mass) and on explosion consequences is investigated. In parallel, overpressures resulting from ignition are calculated as a function of the time to ignition.