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Flaw Assessment in a Petro-Chemical Spherical Shell by Using FAD Method

[+] Author Affiliations
Doo-Ho Cho, Yoon-Suk Chang, Jae-Boong Choi, Young-Jin Kim

Sungkyunkwan University, Suwon, South Korea

Sang In Han

Korea Institute of Gas Safety Research & Development, Shihung, South Korea

Paper No. PVP2008-61523, pp. 125-129; 5 pages
doi:10.1115/PVP2008-61523
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME

abstract

As the increase of operating times of petro-chemical facilities, possibility of flaw occurrences has been rapidly increased also. From a recent in-service inspection, three different sized surface cracks (crack depths of 4.5, 9.9 and 14.2 mm) were detected in welding parts of a spherical shell in Korea. While API579 code provides corresponding assessment procedures to determine crack driving forces, in the present work, numerical analyses are carried out for the cracked spherical shell to investigate effects of complex geometry, analysis model and residual stress. From detailed finite element analysis, stress distributions are determined for the full three-dimensional model. Then, stress intensity factors are calculated for simplified model by employing the well-known influence stress function technique. Finally, parametric structural integrity evaluation of the cracked spherical shell is conducted by using failure assessment diagram method. And the numerical results reflecting different geometry, analysis model and residual stress are fully discussed.

Copyright © 2008 by ASME

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