Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Structural Capability Evaluation of the Conventional and Pilot Type Valves for LNG/LNG-FPSO Ships

LNG/LNG-FPSO 선박용 컨벤셔널 및 파일럿 타입 밸브의 구조성능평가

  • Hwang, Dong Wook (School of Mechanical Engineering, Pusan National Univ.) ;
  • Kim, Sung Jin (Research Institute of Mechanical Technology, Pusan National Univ.) ;
  • Bae, Jun Ho (School of Mechanical Engineering, Pusan National Univ.) ;
  • Jung, Sung Yuen (Research Institute of Mechanical Technology, Pusan National Univ.) ;
  • Kim, Chul (Research Institute of Mechanical Technology, Pusan National Univ.)
  • 황동욱 (부산대학교 기계공학부) ;
  • 김성진 (부산대학교 기계기술연구원) ;
  • 배준호 (부산대학교 기계공학부) ;
  • 정성윤 (부산대학교 기계기술연구원) ;
  • 김철 (부산대학교 기계기술연구원)
  • Received : 2012.06.04
  • Accepted : 2012.09.06
  • Published : 2012.12.01
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Abstract

Safety valve used in LNG/LNG-FPSO ships is a high value valve, and it plays an important role in maintaining a fixed level of pressure by emitting LNG gas out of pipes in LNG piping system under the cryogenic and high-pressure condition when the pressure of the system connected with the LNG storage tank and pipes reaches over the set pressure. The structural stability is required for the inner pressure and thermal load because of the cryogenic and high-pressure condition, and a reliability of the safety valve is necessary for impact and deformation by opening the valve. But, the safety valve, which plays a key role for a safety of the transport and storage system, is depended on imports for over 90%, and in domestic production, the design of the valve is performed on the basis of experiences of the works without quantitative analysis for the inner operation characteristics and structural stability of the valve. In this study, impact velocity is calculated by theoretical analysis for obtaining the structural stability of the guide according to the impact load by opening the valve. The shape of the guide and the diaphragm for satisfying the structural stability are suggested and verified by using a thermal-structural analysis.

Keywords

References

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