Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Welding Deformation and Its Correction of Cylindrical Moon Pool Structure

원통형 문풀 구조물의 탑재 시 변형과 수정

  • Seong, Woo-Jae (Industrial Application R&D Institute, Daewoo Shipbuilding & Marine Engineering Co., Ltd.) ;
  • Chun, Kwang-San (Industrial Application R&D Institute, Daewoo Shipbuilding & Marine Engineering Co., Ltd.)
  • 성우제 (대우조선해양(주) 산업기술연구소 용접기술연구부) ;
  • 천광산 (대우조선해양(주) 산업기술연구소 용접기술연구부)
  • Received : 2019.04.17
  • Accepted : 2019.06.19
  • Published : 2019.10.20
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Abstract

Turret mooring type Floating Production Storage and Offloading (FPSO) is designed to rotate the hull around a turret system. The system is mounted inside a cylindrical moon-pool structure of the ship hull structure. The upper part of the moon-pool structure called Bogie Support Structure (BSS) is supported on ring type rail structure (bogie), so high roundness is required at the top of the structure. In this study, the deformation measured during BSS installation was compared with the predicted values through the thermal elasto-plastic analysis, and the causes of deformation were analyzed. Deformation behavior of cylindrical structure with a very large diameter compared to the thickness was investigated. In addition, a proper welding sequence and correction method for the deformed structure were proposed. This study can be an example of the solution to the tolerance problem of large cylindrical structures.

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References

  1. Ha, Y.S., 2012. Thermal distortion analysis by inconel over-lay at circular moonpool structures. Journal of the Society of Naval Architects of Korea, 49(4), pp.304-311. https://doi.org/10.3744/SNAK.2012.49.4.304
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