Case Study: Mixing and Heating a Flammable Liquid in an Open Top Tank, Bellwood, Illinois, June 14, 2006 [open pdf - 344KB]
"This Case Study describes the ignition of a vapor cloud generated by mixing and heating a flammable liquid in an open top tank without adequate safety controls. The tank was located in the chemical mixing area of the Universal Form Clamp (UFC) facility in Bellwood, Illinois, a suburb of Chicago. On the morning of June 14, 2006, an operator was mixing and heating a flammable mixture of heptane and mineral spirits in a 2,200-gallon open top tank equipped with steam coils. The finished product, 'Super Clean and Tilt,' is a proprietary mixture, which is applied to cured concrete surfaces to prevent bonding with wet concrete." Key issues discussed include: flammable liquid process design, engineering controls, plan review and code enforcement, and emergency preparedness.
Investigation No. 2006-08-I-IL
U.S. Chemical Safety and Hazard Investigation Board: http://www.csb.gov/