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영어

An accident happened which a laborer burned himself in the toilet in the office building of the factory using CNC(Computer Numerical Control) gas cutting machine because of an unknown fire and he was dead a few days later. Immediately after the fire, colleagues asked him all the details and the deceased stated that when he sat on a cistern type flushing toilet and lighted a cigarette with a lighter, the fire happened with a sound like "pung". In the result of the initial investigation of the police the fire causes were not found and the police requested the National Institute of Scientific Investigation to make a close investigation of the fire. In the results of the field investigation and the reappearance experiments, we concluded the fire cause the following statements. One day before the accident by the unlocking of the backflow-preventing valve in the process of blow of cooling water by inserting high pressure oxygen gas in the cooling water pipe to prevent a winter- breaking of the cooling water pipe used in CNC gas cutting machine along the water supply pipe, oxygen outflowed through the cistern in the flushing toilet about 50m apart from the gas cutting machine and stayed in the toilet. The next day morning at the moment that the deceased goes in the toilet and lights a cigarette with a lighter, rapid flame was generated with an explosive sound like a gas explosion because of the high dense oxygen.