The U.S. Chemical Safety Board (CSB) has issued its final draft report on the 2008 Imperial Sugar refinery explosion in Georgia. The board faulted releases of sugar from inadequately designed and maintained dust-collection equipment, conveyors, and sugar-handling equipment. Inadequate housekeeping practices also played a role by allowing combustible sugar dust and granulated sugar to build up in the refinery's packing buildings.

CSB says the first explosion likely occurred inside a conveyor located beneath two large sugar-storage silos. At the time of the explosion, the conveyor had recently been enclosed with steel panels. This created a confined, unventilated space where sugar dust could accumulate. The dust, according to the safety panel, was ignited by an overheated bearing, which resulted in a series of secondary explosions that killed 14 workers and injured 36 others.

Noted CSB lead investigator John Vorderbrueggen, “Imperial’s management as well as the managers of the Port Wentworth refinery did not take effective actions over many years to control dust-explosion hazards—even as smaller fires and explosions continued to occur at their plants and other sugar facilities around the country.” The final report, which followed a 19-month investigation, includes safety recommendations, such as following National Fire Protection Association best practices for preventing dust fires and explosions.

The report findings were criticized by unions representing chemical and food-industry workers. They contend that CSB’s recommendations were not strong enough to prevent similar explosions in the future.