Abstract: Through the investigation of an accident in which a concentrated sulfuric acid storage tank exploded during hot work in an enterprise, this paper introduces the characteristics of gas explosion traces, heating traces of steel oxide layer in the storage tank, and trace characteristics of steel oxide layer caused by explosion impact waveform during the identification process of the explosion accident. Combined with video reconnaissance analysis and spatial analysis technology, the cause of the sulfuric acid storage tank explosion accident is identified. This provides experience reference for future safety prevention and explosion accident investigation of iron sulfuric acid storage tanks.

Key words: sulfuric acid storage tank, confined space, hydrogen explosion, shock wave, deflagration