Dust explosion when flour was fed into a storage hopper by air pressure
A dust explosion occurred within a storage hopper when flour was fed into a storage hopper.
On the day of the accident, flour stored within the storage hopper was first put into bags. This bagging work was completed around 3:00 in the afternoon.
Following this, the victim confirmed that no flour was left inside the storage hopper by lowering a shielded electric light inside the storage hopper from the inspection hatch located at the upper part of the bin.
About one hour after confirming that the hopper was empty, another worker started feeding flour into the hopper by air pressure. About 30 minutes after the start of the feed, the victim noticed an offensive odor around the bin. While the victim was checking the cause, an explosion occurred in the upper part of the bin, and the victim suffered burns from hot gases generated in this explosion.
The following can be considered as the causes of this accident.