To be able to limit the consequences of gas explosions, one has to predict gas explosion loads. Once these loads are known, structural measures to limit damage to the offshire rig can be taken. Prediction of the loads due to gas explosions is only possible on the basis of a good understanding of the processes governing this phenomenon. The aim of this paper is to describe the current understanding of gas explosion development in complex geometries. Important parameters of influence will be presented using experimental results. The principles of mitigation methods will be explained and methods for predicting gas explosion loads will be reviewed. Work performed at Christian Michelsen Research will be used as examples.