Abstract: 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.
Key words: Gathering
tube Heat recovery boiler Initial damage Failure assessment
Numerical simulation
*
This
project is supported by Foundation of Yangzi Petrochemical Ltd. and
Chinese Academy of Science (No. KJ95-1-201). Selected from Proceedings
of 2000 the First International Conference on Mechanical
Engineering; revised manuscript June 6, 2001
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