Pipe failure accidents (bursting) are frequent in thermal power plants, and severely mfluence the safe and economic running of power generation units. The authors analyzed the possible causes and features of coated-after superheater pipe bursting in boilers. Taking the coated-after superheater pipe bursting accident in a power plant for an example, the authors conducted macroscopic topography analysis, running environment analysis, metallurgical analysis, chemical composition analysts and strength analsis of the bulged pipe, ruled out mat the coated-after superheater pipe basting was caused by superheating, and demonstrated that the bursting was caused by crack defect that had not been found during regular inspection.
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