• Title/Summary/Keyword: LNG 화물시스템

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Research of Combined Containment System for Floating LNG (플로팅 엘엔지 복합 화물창 시스템 연구)

  • Kim, Soo-Young;Kim, Sung-Chul;Lee, Dong-Hyun
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.3
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    • pp.342-347
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    • 2015
  • Floating LNG is a new concept which is used as LNG regasification/receiving facility and for LNG production/export facility. LNG Floating Production Storage and Offloading(FPSO) concept will put vitality into marginal gas fields which were delayed because of excessive investment cost in the world. LNG Floating Storage Regasification Unit(FSRU) also provides commercially competitive and effective solutions to the areas where onshore infrastructure is not well established. LNG cargo containment system is one of the key functions for FLNG to store produced LNG on a floating structure. This paper presents a new technology related to a LNG containment system; a combined cargo containment system utilizing the advantages of iIndependent tank type and membrane system. Technical advantages have been validated through research work.

A study of feasibility of using compressed wood for LNG cargo containment system (압축목재를 사용한 LNG 화물창 단열시스템의 적합성 평가에 관한 연구)

  • Kim, Jong-Hwan;Ryu, Dong-Man;Park, Seong-Bo;Noh, Byeong-Jae;Lee, Jae-Myung
    • Journal of Advanced Marine Engineering and Technology
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    • v.40 no.4
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    • pp.307-313
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    • 2016
  • When liquefied natural gas (LNG) is stored in a tank, it is necessary to maintain low temperature. It is very important that insulation techniques are applied to the LNG cargo because of this extreme environment. Hence, laminated wood, especially plywood, is widely used as the structural member and insulation material in LNG cargo containment systems (CCS). However, fracture of plywood has been reported recently, owing to sloshing effect. Therefore, it is necessary to increase the strength of the structural member for solving the problem. In this study, compressed wood, which is used as a support in LNG independent type B tanks, was considered as a substitute for plywood. Compression and bending tests were performed on compressed wood under ambient and cryogenic temperatures to estimate the mechanical behaviors and fracture characteristics. In addition, the direction normal to the laminates surface was considered as an experimental variable. Finally, the feasibility of using compressed wood for an LNG CCS was evaluated from the test results.

Structural and Vibrational Characteristics for the Scaffolding System of LNG Cargo Containment (LNG 화물창 비계 시스템의 구조해석 및 진동 특성)

  • Ryu, B.J.;Shin, G.B.;Nahm, Y.E.;Oh, B.J.;Baek, S.G.;Kim, H.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.11a
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    • pp.1197-1202
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    • 2007
  • The paper deals with the structural analysis and vibration test for the scaffolding system of LNG cargo containment. The eight-stories scaffolding system has telescopic area, working area, coner area and storage area in real system. In the structural analysis, the maximum displacement and stress of the each floor for the scaffolding system are investigated by finite element method. In the vibrational analysis, the natural frequencies and mode shapes for 8-stories scaffolding system of the LNG cargo containment are investigated. In order to compare theoretical natural frequencies with experimental ones, small size of 2-step scaffolding structure is used, and the theoretical results for natural frequency have a good agreement with experimental ones.

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Structural and Vibration Characteristics for the Scaffolding System of LNG Cargo Containment (LNG 화물창 비계 시스템의 구조해석 및 진동 특성)

  • Oh, B.J.;Ryu, B.J.;Lee, Y.S.
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.6
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    • pp.546-554
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    • 2010
  • The paper deals with the structural analysis and vibration test for the scaffolding system of LNG cargo containment. The eight-stories scaffolding system has telescopic area, working area, coner area and storage area in real system. In the structural analysis, the maximum displacement and stress of the each floor for the scaffolding system are investigated by finite element method. In the vibrational analysis, the natural frequencies and mode shapes for 8-stories scaffolding system of the LNG cargo containment are investigated. In order to compare theoretical natural frequencies with experimental ones, small size of 2-step scaffolding structure is used, and the theoretical results for natural frequency have a good agreement with experimental ones.

A Study on the Improvement of LNGC Re-liquefaction System (LNG선 재액화 시스템의 성능 개선에 관한 연구)

  • Oh, Cheol;Song, Young-Uk
    • Journal of Navigation and Port Research
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    • v.33 no.10
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    • pp.659-664
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    • 2009
  • LNG carriers have, up to 2006, mainly been driven by steam turbines. The Boil-Off Gas from the LNG cargo tanks has so far been used as fuel. This is a costly solution that requires special skills during construction and operation. Alternative propulsion systems offer far better fuel economical efficiency than steam turbines. Instead of previous practice using Boil-Off Gas as a fuel, the Re-liquefaction system establishes a solution to liquefy the Boil-Off Gas and return the LNG to the cargo tanks. This Re-liquefaction of Boil-Off Gases on LNG carriers results in increased cargo deliveries and allows owners and operators to choose the most optimum propulsion system. In this study, thermodynamic cycle analysis has been performed on two type of LNG Re-liquefaction system which was designed and adopted for the Q-Flex(216,000$m^3$) and Q-Max(266,000$m^3$) LNG carrier under construction at Korea ship yards and variable key factor was simulated to compare efficiency, power and nitrogen consumption of each Re-liquefaction system.

A Study On Development of Cargo Working Education System for LNG Carrier (LNG선 하역작업 교육 시스템 개발에 관한 연구)

  • Eum Pil-Yong;Kim Dae-Hee;Song Chae-Uk;Yea Byong-Deok
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2005.10a
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    • pp.89-92
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    • 2005
  • This paper describes a system for LNG carrier's loading and discharging work education This system consists of three modules(cargo work simulation, ballast work simulation and loading calculation module), and could be a useful to train mariners boarding on LNG carrier so as to take a suitable action while their ship maneuvering and cargo handling.

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An Effect of Surface Dashpot for KC-1 Basic Insulation System Under Sloshing Loads (슬로싱 하중을 받는 KC-1 단열시스템의 표면 완충 효과)

  • Jin, Kyo Kook;Yoon, Ihn Soo;Yang, Young Chul
    • Transactions of the KSME C: Technology and Education
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    • v.3 no.3
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    • pp.193-199
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    • 2015
  • Sloshing of LNG cargo can cause high impact loads on the supporting and containing structures. This is particularly critical for membrane-type tanks since these will have flat surfaces and corner regions which can lead to increased peak pressures for sloshing impacts. The membrane-type containment system is much more flexible compared to the steel hull structure. As a result, fluid-structure interaction plays an important role in the structural analysis of the containment system under sloshing load. This study is based on the direct calculation method of applying sloshing loads to the KC-1 basic insulation system using finite element analysis. The structural analysis of KC-1 basic insulation system considers the dashpot as fluid-structure interaction between liquid cargo and the LNG containment system. The maximum stress of the polyurethane form for KC-1 insulation system is 1.5 times lower than one without dashpot.

Research of Design Improvement regarding Foundation Technologies for Floating LNG (Floating LNG 기반기술에 관한 설계개선 연구 (철회된 논문입니다.))

  • Lee, Dong-Hyun;Ha, Mun-Keun;Kim, Soo-Young;Shin, Sung-Chul
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.3
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    • pp.220-230
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    • 2014
  • Typical technical issues associated with Floating LNG (FLNG: FSRU and LNG FPSO) design are categorized in terms of global performance evaluation. Although many proven technologies developed through LNG carrier and oil FPSO projects are available for FLNG design, we are still faced with several technical challenges to clear for successful FLNG projects. In this paper, some of the challenges encountered during development of the floating LNG facility (i.e. LNG FPSO and FSRU) will be reviewed together with their investigated solution. At the same time, research of design improvement including new LNG-related technologies such as combined containment system will be presented to overcome the unrevealed challenges for the FLNG development.

Study on Hydroelastic Analysis of LNGC Cargo by Global-Local Analysis Technique (전역-국부 해석기법에 의한 LNG 운반선 화물창의 유탄성 해석에 관한 연구)

  • Park, Seong-Woo;Cho, Jin-Rae
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.20 no.1
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    • pp.83-92
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    • 2007
  • There are many numerical methods to solve large-scale fluid-structure interaction(FSI) problems. However, these methods require very fine mesh to achieve the reasonable numerical accuracy and stability due to the concentrated and volatile hydrodynamic pressure caused by the liquid sloshing. Consequently, the numerical analysis targeting for the long-period time response with the desired numerical accuracy Is very highly time-consuming. The aim of this paper is to suggest a new method to analyze the hydroelastic behavior of the LNGC containment by using the global-local numerical approach. The reliability of the presented method is firstly examined, and then its efficiency is demonstrated by presenting that the long-period local responses of the LNGC containment are obtained with relatively short CPU time.

Structural Safety Assessment of Independent Spherical LNG Tank(3rd report) - Safety assessment of tank system against crygenic temperature - (독립구형 LNG 탱크의 구조안전성 평가(제3보) - 탱크시스템의 저온 안전성 검토 -)

  • Yong-Yun Nam;In-Sik Nho;Ho-Sup Lee
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.4
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    • pp.83-92
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    • 1993
  • This paper describes structural safety assessment techniques against crygenic temperature to design MRV type B LNG tank system. The following items are detail with in detail. (1) Leakage estimation of LNG through the propagating clacks at tank plate was performed and design of the range of catch basin(2ndary barrier) was followed to ensure the safety of ship structures against leaked LNG. (2) Temperature distribution analysis for cargo hold and skirt system was carried out using the steady state heat transfer analysis model for spherical LNG tank system. (3) Thermal stress distribution of skirt and tank system was calculated, where very stiff thermal variation was shwn through item(2) analysis.

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