The boiling liquid expanding vapor explosion (BLEVE) is a most common hazard in liquefied gas storage and transportation

and its explosion energy depends on the superheat degree of the metastable liquid at the loss of containment. For preventing the flash boiling of liquefied gas

this paper presents a new method by using micro-fin surface to promote nucleation in superheated liquid. A visualized experimental rig is established. The nucleation process on micro-fin surface under rapid depressurization is observed and compared to that on smooth surface; the transient pressure evolution in the container is measured. The results show that the onset of nucleation on micro-fin surface is about 50 ms earlier than that on smooth surface. The adopted micro-fin surface in the experiments reduces the pressure rebound and the maximum liquid superheat degree by up to 24.1% and 21.7% respectively among the release pressures of 200-500 kPa.