Danger and injury of unloading acid without wearing protective equipment

1. After the accident

in the summer of 2000, three loaders unloaded the dangerous chemical sulfuric acid at a railway freight yard in Anhui Province. According to the normal procedure, they first connect the upper discharge pipe of the tank car with the flange of the conveying pipe, and pressurize the tank. When the pressure reached the requirements, the sulfuric acid still did not flow out, then the vent pressure was taken to open the big cover of the slot, and the inspection found that the discharge pipe in the slot was blocked. So three people took the flange apart and inserted the steel pipe into the discharge pipe for dredging. When the discharge pipe is tampounded, the white foam liquid in the tube is sprayed up to more than 3 meters, splashing to 3 people standing on the trough and face. As the three people did not wear protective masks, their eyes were dark and their eyes were painful. They were washed with water and sent to the hospital for alkali injury. After more than half a year of treatment, the visual acuity of the three patients was less than 0.2, and the lacrimal gland was damaged< According to the investigation, the sulfuric acid tank was used to hold liquid alkali before loading, and it was cleaned before loading sulfuric acid this time. The analysis shows that the discharge pipe on the tank is not cleaned in place, and the dry liquid alkali is stuck at the lower part of the discharge pipe. When it is dredged, the alkali, reaction brine and acid are ejected successively due to the pressure of sulfuric acid on the one hand, the cause of the accident was that the tank car was not cleaned in place; on the other hand, the acid unloading workers did not wear protective masks as required. 1n this dangerous situation, there is no protection 3. Accident handling and prevention after the accident, the freight yard organized relevant departments to carry out investigation and analysis, implemented the treatment of the wounded, distinguished the responsibilities, educated the staff and carried out safety publicity activities

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