The burst-leakage of "four tube kinds" in utility boilers are main causes leading to non-planned boiler shutdown in power plants

while the main causes resulting in burst-leakage of "four tube kinds" in boilers are:overtemperature excess heating

corrosion

worn-out

and thermal fatigue etc..The concrete causes leading to over temperature excess heating

corrosion

worn-out

and thermal fatigue etc.have been analysed

so as to provide basis for elimination of the burst-leakage problem for "four tube kinds" in boilers.