• Title/Summary/Keyword: Lng Bunkering

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Study on the Estimation of Towing Force for LNG Bunkering Barge (LNG 벙커링 바지의 예인력 산정에 관한 연구)

  • Oh, Seung-Hoon;Jung, Dong-Ho;Jung, Jae-Hwan;Hwang, Sung-Chul;Cho, Seok-Kyu;Sung, Hong-Gun
    • Journal of Navigation and Port Research
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    • v.42 no.6
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    • pp.378-387
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    • 2018
  • In this paper, the towing force for the LNG bunkering barge was investigated. Currently, LNG bunkering barge is being developed as an infrastructure for the bunkering of LNG (Liquefied Natural Gas), an eco-friendly energy source. In the case of the LNG bunkering barge, self-propulsion is considered through retrofit from an operating point. Therefore, the LNG bunkering barge's shape is similar to that of the ship as compared to a towed barge, so a rule of the towed barge overestimates the towing force. In order to improve accuracy, the calm water resistance was calculated using ITTC 1978 method which considers wave resistance by the Rankine source method. The added resistance in waves was calculated using the modified radiated energy method which considers the shortwave correction method of NMRI. The performance of the towing resistances through the calm water resistance and the added resistance in waves was compared to rules associated with towed barges.

Analysis of Regional Economic Ripple Effects of Constructing LNG Bunkering Infrastructure at Busan Port (부산항 LNG 벙커링 인프라 구축에 따른 지역경제 파급효과 분석)

  • Suyeon Yoo;Gookbin Kim;Heesung Mun;Geonwoo Bae;Dong Koo Kim
    • Environmental and Resource Economics Review
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    • v.33 no.3
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    • pp.291-314
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    • 2024
  • The International Maritime Organization (IMO) has strengthened environmental regulations, leading to an increase in demand for LNG-powered ships. To enhance the competitiveness of ports and promote the use of LNG-powered ships, establishing LNG bunkering infrastructure is necessary. However, no ports in Korea currently have such infrastructure. This study used the 2015 regional input-output table to examine the economic impact of establishing LNG bunkering infrastructure in Busan Port, the largest port in Korea. The estimated cost of the project in 2023 was KRW 21.09 billion. The average production, value-added, and employment inducement coefficients were 1.223, 0.372, and 7.58, respectively.

A Study on the Evaluation of Structural Safety of Saddle for Bunkering of LNG Fueled Ship (LNG 연료추진선의 벙커링을 위한 Saddle의 구조 안전성 평가에 관한 연구)

  • Kim, Tae-Wook;Cho, Su-Gil;Kim, Seong-Soon;Jhun, Jeong-Ik;Kim, Hyung-Woo
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.6_2
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    • pp.745-751
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    • 2021
  • The International Maritime Organization(IMO) has established Emission Control Areas(ECA) in the Baltic Sea, North Sea, and sea areas in the United States since 2012, and encourages the use of clean fuels such as Natural Gas(NG). To keep pace with the increase in international demand for LNG bunkering vessels, research for the localization of key equipment for LNG bunkering must also be performed in Korea. For research and development of core bunkering equipment and systems, in this study, heat transfer analysis and structural analysis were performed by modeling the saddle, which must first be secured structurally by directly receiving the load of the hose. As a result, the suitability of the model was reviewed by analyzing the temperature distribution and stress level through the analysis results of this study.

Thermal analysis of LNG storage tank for LNG bunkering system (LNG 벙커링용 고효율 LNG 저장탱크 열해석)

  • Yun, Sang-kook
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.876-880
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    • 2015
  • In 2016, the IMO's new rules for an 80% reduction in NOx emissions in newly built ships will necessitate the use of LNG as a clean fuel. So far, the developed European countries have led the development of LNG bunkering ships and related facilities. An LNG bunkering system stores LNG in a horizontal or vertical IMO "C"-Type tank insulated with perlite powder, and a vacuum in the annular space between the double walls, like the cryogenic liquid nitrogen tank. Current storage tanks have high heat leakage, evaporating over 2.0% daily, and are difficult to build with the required vacuum. A more efficiently insulated storage tank could reduce the evaporation rate. This research carried out thermal analysis on a new effective insulation method that separates high vacuum in the annular space between two tanks with a solid insulation material, such as urethane foam, lining the outer vessel. This highly efficient insulation system obtained an evaporation rate of 0.03% per day under a $10^{-3}torr$ vacuum, and an evaporation rate of 0.11% at $10^{-45}torr$. Even if the space loses its vacuum, the new insulation system showed a lower evaporation rate of 4.12% than the present perlite system of 4.9%. This newly developed tank can increase the efficiency of LNG storage tank and may help keep LNG bunkering systems safe.

Direct strength evaluation of the structural strength of a 500 cbm LNG bunkering ship

  • Muttaqie, Teguh;Jung, DongHo;Cho, Sang-Rai;Sohn, Jung Min
    • Structural Engineering and Mechanics
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    • v.81 no.6
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    • pp.781-790
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    • 2022
  • The present paper describes a general procedure of the structural safety assessment for the independent type C tank of LNG bunkering ship. This strength assessment procedure consists of two main scheme, global Finite Element Analysis (FEA) model primarily for hull structure assessment and detailed LNG Tank structures FEA model including the cylindrical tank itself and saddle-support structures. Two kinds of mechanism are used, fixed and slides constraints in fore and rear of the saddle-support structures that result in a variation of the reaction forces. Finite Element (FE) analyses have been performed and verified by the strength acceptance criteria to evaluate the safety adequacy of yielding and buckling of the hull and supporting structures. The detail of FE model for an LNG type C tank and its saddle supports was made, which includes the structural members such as cylindrical tank shell, ring stiffeners, swash bulkhead, and saddle supports. Subsequently, the FE buckling analysis of the Type C tank has been performed under external pressure following International Gas Containment (IGC) code requirements. Meanwhile, the assessment is also performed for yielding and buckling strength evaluation of the cylindrical LNG tank according to the PD 5500 unfired fusion welded pressure vessels code. Finally, a complete procedure for assessing the structural strength of 500 CBM LNG cargo tank, saddle support and hull structures have been provided.