“…Of course, as observed by Lunn et al [81] and others [2,12] the explosive atmosphere in one vessel does not necessarily ignite the dust in the second vessel. It has been found experimentally that the likelihood of ignition breakthrough to the second vessel is a function of the dust properties, the dust concentration, the type of venting of the second vessel, the ducts diameters, the severity of the primary explosions and the presence of any obstructions in the connecting duct [82].…”