＜正＞A numerical model on stress assessment of a defective elliptic gathering tube used in the heat recovery boiler of a pyrolyzer is built up. The effect of local defects on the carrying capacity of the tube is analyzed by using the MSC/NASTRAN finite element code, and the critical size of defects is obtained. Then, two numerical models of damaged tube with local and integral reinforcements, respectively, are also calculated. Stress classification and assessments are provided by applying the ASME and JB4732-1995 standard. Some guidance and suggestions about the tube reinforcements and the prediction of the remaining life of the structure for engineering practice are discussed.
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