Through macroscopic examination and microstructure analysis

the causes leading to tube-burst in low-temperature reheater of a 1021 t/h boiler during operation in a period less than one year have been analysed

and disposal measures being put foreard. Result of analysis shows that the main cause resulting in tube-burst of low-temperature reheater is as follows: the thermal insulation of manhole gate is not perfect

making the tube-row near the manhole gate to suffer locally serious fly ash wornout.