Hot work is welding, cutting or grinding done near flammable vapors. Some companies require hot work permits any time hot work is done outside a welding bay. The Chemical Safety Board (CSB) released a new video on hot work, focusing on findings from several investigations.
They recommend gases be monitored in tanks before and during all hot work. Communication with employees and contractors is also a key factor in preventing fires, explosions and fatalities.
The video is posted at http://www.csb.gov/.