In this video, we will see an accident in confined space at Valero Refinery, Delaware, USA, in November 2005. This accident caused two workers died.

Nitrogen purging is a procedure required when equipment containing flammable material will be opened. It means that after nitrogen purging or nitrogen substitution oxygen concentration inside the equipment will be very low, as well as area around the confined space opening. And that made this accident happened. (more…)