Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Evaluation of Insulation Performance and Structural Integrity of an IMO Type C LNG Storage Tank

IMO Type C LNG 저장 탱크의 단열성능 및 구조적 건전성 평가

  • Park, Heewoo (Korea Register) ;
  • Park, Jinseong (Dept. of Mechanical Engineering, Korea Maritime & Ocean University) ;
  • Cho, Jong-Rae (Dept. of Mechanical Engineering, Korea Maritime & Ocean University)
  • Received : 2021.06.10
  • Accepted : 2021.06.25
  • Published : 2021.07.31
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Abstract

Restrictions on the emissions of nitrogen oxides, sulfur oxides, carbon dioxide, and particulate matter from marine engines are being tightened. Each of these emissions requires different reduction technologies, which are costly and require many pieces of equipment to meet the requirements. Liquefied natural gas (LNG) fuel has a great advantage in reducing harmful emissions emitted from ships. Therefore, the marine engine application of LNG fuel is significantly increasing in new ship buildings. Accordingly, this study analyzed the internal support structure, insulation type, and fuel supply piping system of a 35 m3 International Maritime Organization C type pressurized storage tank of an LNG-fueled ship. Analysis of the heat transfer characteristics revealed that A304L stainless steel has a lower heat flux than A553 nickel steel, but the effect is not significant. The heat flux of pearlite insulation is much lower than that of vacuum insulation. Moreover, the analysis results of the constraint method of the support ring showed no significant difference. A553 steel containing 9% nickel has a higher strength and lower coefficient of thermal expansion than A304L, making it a suitable material for cryogenic containers.

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