The causes leading to leakage accidents of different type “four kinds of tubes” in one power plant have been analysed

and corresponding remedial measures being put forward from repair and operation aspects. After implementing the said measures

tubeburst ratio due to overtemperature of the heating surface has reduced from 34.8% to 15%

occurrence ratio of said leakage accidents due to improper repairs has also greatly decreased

but leakage times resulting from welded defects and material quality of the heating surface are enhanced obviously.