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大庆某炼油厂蜡加氢装置在2000年7月检修过程中,发现该装置浮头式换热器（位号E-9004）浮头螺栓（件号13）断裂7根,受炼油厂委托,对螺栓断裂原因进行了分析。
During the overhaul of the wax hydrotreater of a refinery in Daqing in July 2000, it was found that seven floating head bolts (No. E-9004) of the floating head heat exchanger (No. E-9004) were broken by the refinery. The reason of fracture was analyzed.