Why Reactions Run Away

Exothermic runaway incidents caused by poor understanding of the reaction chemistry and kinetics, under-rated control and safety backup systems, and inadequate procedures and training continue to be reported to the Health and Safety Executive (HSE). Although guidance and training to prevent such incidents is available, further work is needed to increase awareness of the problems. A recent HSE survey indicates that further information on relief system sizing is also required. A workbook on this topic is in preparation, and a leaflet, drawing attention to the hazards of exothermic runaway, is being published. Further action by the HSE to increase awareness is being considered.