Since my post earlier this week I have received several comments and questions as to whether this “explosion” was in fact a Boiling Liquid Expanding Vapor Explosion. So I took the video and did a frame-by-frame examination of the event and I can say without question this was a classic BLEVE event. As we can see in this pic, we see the large and rapid expansion of vapor immediately upon failure of the pressure vessel and several frames later we have full ignition of this cloud.
SAFTENG members can log in to see the full frame-by-frame breakdown of the video as the BLEVE occurred: