Cause Analysis of Tube Bursting in a Station Boiler′s Sparse Rear Water Wall Tube

A double-fracture tube bursting accident in a station boiler′s sparse rear water wall tube was analyzed by many tests and several research methods, such as chemical composition analysis, mechanical testing, fracture macroscopic inspection, fracture SEM analysis, metallographic examination, diffuse hydrogen content test in fracture metal, wall thickness and diameter measure. etc. And incorporating the information of the boiler′s operational log, it is cocluded that the primary reason of the sparse rear water wall tube′s bursting was the wall thinning by flue gas blowing. Some improved methods was put forword.