Multilayered pressure vessels tend to induce stress corrosion cracking (SCC) in the heavy weld. This conclusion is based on the recent ruptured urea reactor failure analysis. Finite element simulation proved that multilayered urea reactors have yielded zones at the heavy weld where the SCC crack initiated. Acoustic emission (AE) examination conducted for two in-service urea reactors revealed AE event clusters at the heavy weld and subsequent phased array reexamination confirmed the existence of propagating defects in the heavy weld. The results also showed that AE evaluation and phased array reexamination are sound combination methods to evaluate the integrity of multilayered urea reactors. Besides, they are superior to -ray inspection because of the uncertain propagation direction of SCC cracks.
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November 2007
Research Papers
Urea Reactor Integrity Evaluation Based on Failure Analysis
Mingda Song,
Mingda Song
School of Mechanical Engineering,
e-mail: smdaazyf@163.com
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China; Shandong Special Equipment Inspection & Research Academy
, 9 Shanda Road, Jinan, 250013, Shandong Province, People’s Republic of China
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Weiqiang Wang,
Weiqiang Wang
School of Mechanical Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China
Search for other works by this author on:
Yafan Zhao,
Yafan Zhao
School of Materials Science and Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China
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Yuliang Cui
Yuliang Cui
School of Mechanical Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China
Search for other works by this author on:
Mingda Song
School of Mechanical Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China; Shandong Special Equipment Inspection & Research Academy
, 9 Shanda Road, Jinan, 250013, Shandong Province, People’s Republic of Chinae-mail: smdaazyf@163.com
Weiqiang Wang
School of Mechanical Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China
Yafan Zhao
School of Materials Science and Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of China
Yuliang Cui
School of Mechanical Engineering,
Shandong University
, 73 Jingshi Road, Jinan 250061, Shandong Province, People’s Republic of ChinaJ. Pressure Vessel Technol. Nov 2007, 129(4): 744-753 (10 pages)
Published Online: February 24, 2007
Article history
Received:
August 10, 2006
Revised:
February 24, 2007
Citation
Song, M., Wang, W., Zhao, Y., and Cui, Y. (February 24, 2007). "Urea Reactor Integrity Evaluation Based on Failure Analysis." ASME. J. Pressure Vessel Technol. November 2007; 129(4): 744–753. https://doi.org/10.1115/1.2767368
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