Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Evaluation of structural integrity of the HP vaporizer and pipes of LNG fuel gas supply system

LNG 연료 선박용 FGSS의 고압 기화기와 출입구 배관에 대한 구조 건전성 평가

  • Kim, Chang-Soo (R & D Center, DongHwa Entec) ;
  • Yoon, Joo-Hwan (Department of Mechanical Engineering, Korea Maritime and Ocean University) ;
  • Lee, Chang-Joon (Department of Mechanical Engineering, Korea Maritime and Ocean University) ;
  • Ha, Man-Young (School of Mechanical Engineering, Pusan National University) ;
  • Cho, Jong-Rae (Division of Mechanical Engineering, Korea Maritime and Ocean University)
  • Received : 2016.09.20
  • Accepted : 2016.11.01
  • Published : 2016.11.30
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Abstract

Heavy oil used as ship propulsion has a serious issue regarding exhaust emission of global warming. Recently, among large-scale merchant ships are using LNG as green ships so called ech-ships. In this study, an vaporizer and pipes under cryogenic and high pressure load were considered to evaluate structural integrity according to codes. Structural analysis of the vaporizer and pipes was performed using the commercial code, ANSYS. Integrity evaluation of the vaporizer based on von Mises stress was performed in accordance with allowable stress specified in ASME Boiler & Pressure Vesssel Section VIII Division 2. To assess structural integrity of the pipes, stress components were combined and compared with ASME B31.3. The calculated stresses for all load cases are lower than allowable stresses, therefore the structural integrity of equipments are verified.

선박의 연료로 이용되는 중유는 지구 온난화를 일으키는 유해가스를 배출한다. 이를 저감하기 위해 친환경선박으로 표현되고 있는 녹색선박이 등장하게 되었고, 천연가스를 연료로 하는 액화천연가스(LNG) 연료 선박이 대표적인 사례이다. 본 논문에서는 LNG 선박에 사용되는 극저온 환경에서 고압 하중을 받는 기화기와 출입구 배관의 구조 건전성을 ASME 코드에 따라 평가하고 실용화한 최초의 사례이다. 기화기와 배관은 유한요소법을 사용하여 구조해석을 수행하였다. 기화기는 등가응력을 바탕으로 ASME Section VIII Division 2에 제시된 허용응력과 비교하여 건전성 평가를 수행하였고, 배관은 성분별 응력을 조합하여 ASME B31.3에 제시된 허용응력과 비교 및 건전성 평가를 수행하였다. 각 하중에 대한 구조물들의 응력 결과는 허용응력 범위 이내에 있으므로 구조적 건전성을 유지하는 것으로 평가되었다.

Keywords

References

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