Abstract: According to the specific type and statistics distribution characters of the pipe cracking faults of “4 pipes” of 1004t/h boiler in Jiangyou Power Plant occurred before the year 1998, combining the destruction forms of team scour, dust erosion, stress fracture, high temperature chemical corrosion and construction elements failures ahead of their lives, the analysis and summary for the factors of coal management, operation management, maintaining, overhauling, and external conditions, etc. which influent on the pipe cracking faults of boiler’s “4 pipes” were carried out, and the main causes were found out. Some directional and practical comprehensive countermeasures were proposed, the obvious results have been obtained. These are able to be the reference for treatments of the same type power units.

Key words: “4 pipes” cracking, fault analysis, countermeasure