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重庆制皂总厂的SHL10—25/400A型锅炉自1991年11月安装投运以来,多次发生过热器爆管事故,该厂曾两次对过热器局部换管,两次被迫对过热器全部更换,最长的运行周期仅八个月,而最短的运行周期还不到两个月。 1994年7月,该台锅炉经第一次全部更换的过热器运行不到半年,过热器又发生爆管事故。查阅有关资料,该锅炉过热器采用顺流布置,低温段为20#碳钢,高温段为15CrMo,该次爆管的过热器曾由有修理证的重庆电力实业开发公司更换,修理方案经市劳动局锅炉处审批,焊工项目符合有关规定,管材和焊材质量证明书各项数据均符合有关规定,换管后经探伤及水压试验合格,并有本所出具的修理合格证书。因此,该次爆管事故可排除因材质和修理质量问题而引起的可能性。
Chongqing soap factory SHL10-25 / 400A type boilers put into operation since November 1991, the super heater burst tube occurred several times, the plant had twice superheater local tube, twice forced to overheat All replacements, the longest operating cycle is only eight months, and the shortest operating cycle is less than two months. In July 1994, the boiler was replaced by a superheater for the first time in less than six months, and a superheater burst pipe explosion occurred. Access to relevant information, the boiler superheater with downstream arrangement, the low temperature section of 20 # carbon steel, high temperature section of 15CrMo, the burst tube superheater had a repair certificate of Chongqing Electric Power Development Company to replace the repair program by the city Labor Bureau boiler approval, welder project in line with the relevant provisions of the pipe and welding consumables quality certificate of the data are in line with the relevant provisions of the test after passing the test and hydraulic pressure test, and the Institute issued by the repair certificate. Therefore, the squib accident can rule out the possibility of material quality and repair quality problems.