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1991年3月5日,某厂开始检修以煤气为燃料的4号锅炉的排污阀。早5时,工人将输送煤气的管道阀门关闭,锅炉停工,将防毒水封注满水。约9时许,由4名工人进行检修,换了阀门,更换了水位计。下午2时,工人在焊接时忽然感到头昏憋气,随即发现有大量煤气逸出,急呼撤离,随即昏倒在楼梯上。附近工人听到喊声赶来,在无任何防护措施情况下冲入现场救人,相继中毒倒下。前面的工人冲进去倒下了,后面的工人
March 5, 1991, a plant began to overhaul the gas-fired boiler No. 4 boiler discharge valve. As early as 5 o’clock, the workers will be shut down gas pipeline valve, boiler shutdown, the antivirus seal filled with water. About 9 o’clock, by four workers overhaul, changed the valve, replaced the water level gauge. At 2 o’clock in the afternoon, when the worker suddenly felt dizzy and fretting while welding, he immediately found that there was a large amount of gas that had escaped and was suddenly evacuated and then collapsed on the stairs. Near the workers heard shouting, without any protective measures into the scene to save the case, one after another poisoned fall. The front of the workers rushed in to go down, behind the workers