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[Music] a new tank was being filled with water for hydrostatic testing two mechanics were working at the stairs near the roof finishing the handrails using angle grinders to polish the structure [Music] hydro static testing is a process in which components of a system are tested for resistance and leakage by filling equipment with a pressurized liquid it serves to identify material failures for tank Mis assembly the responsible operator starts the field activities firstly he opens the switch and activates the pumps Start button immediately after he opens the discharge valve allowing water to enter the tank but if you always later something unexpected happens [Music] an explosion occurs injuring two mechanics working on the tank throwing them against the handrails what happened the tank had been filled with water through a pipeline the same pipeline that contained a few litres of gasoline left over from the previous service so the gasoline was flushed into the tank and floated over the