• Title/Summary/Keyword: LNG저장 탱크

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Design Safety Analysis of $9\%$ Nickel Steel Structure in Inner Tank Storage System (내부탱크 저장 시스템에서 $9\%$ 니켈강재 구조물의 설계 안전성에 관한 연구)

  • Kim Chung Kyun;Choi Dong Yul
    • Journal of the Korean Institute of Gas
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    • v.5 no.4 s.16
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    • pp.49-55
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    • 2001
  • This paper presents the design safety analysis of the inner tank structure, which is manufactured by 9 percent nickel steel sheets in the full containment type LNG storage tank. The FEM computed results indicate that top girder and several stiffener rings of the inner tank play an important role for controlling the deformation and stress intensity of the inner tank structure. The hydrostatic pressure due to cryogenic fluids gave more influential to the deformation of the inner tank wall compared with that of a cryogenic temperature of $-162^{\circ}C$. But, the deformation and stress of the inner tank. which is produced by the buckling loads, are very small because the external load is not applied to the top of the inner tank. This indicates the role of top girder and stiffener rings of the inner tank model is not important in full containment LNG storage tank.

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Advanced Heat Transfer Analysis Model of LNG Storage Tank (LNG 저장탱크의 개선된 온도해석 모델)

  • 전세진;정철헌;진병무;김성운
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.115-120
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    • 2003
  • Several methodologies were devised to reasonably predict the temperature boundary conditions of inner face of the concrete outer tank so as to set up heat transfer analysis model of the full containment above-ground LNG storage tank. In this model, outer tank is solely taken into account and the beneficial effect of suspended deck and insulation layers on the temperature distribution of outer tank is separately formulated according to the proposed procedures. More effective design of the insulations can be achieved when the proposed simple schemes are used in the preliminary stage.

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The Study of Kogas Membrane Performance Test for LNG Storage Tank (Kogas 멤브레인 성능평가에 관한 연구)

  • Kim Y.K.;Hong S.H.;Yoon I.S.;Oh B.T.;Seo H.S.
    • Journal of the Korean Institute of Gas
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    • v.6 no.4 s.18
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    • pp.17-22
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    • 2002
  • LNG demand has been rapidly increasing in Korea for a variety of reasons including stable supply, non-polluting, and high combustion efficiency characteristics. One of the most important structural core element of the LNG storage tank is the membrane, consisting of stainless steel. The membrane to be applied inside of LNG storage tank is provided with corrugations to absorb thermal contraction and expansion caused by LNG temperature. Experimental studies are presented to investigate the deformation and strength of the membrane which is designed by Kogas. All experiments are conducted on the basis of RPIS, and we found the results is fully satisfied with the RPIS.

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인터뷰-한국LP가스공업협회 권순영 전무

  • Korea LPGas Industry Association
    • LP가스
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    • s.103
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    • pp.4-5
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    • 2006
  • 정부는 영세서민들의 연료인 프로판에 부과되는 특소세를 폐지하고, 소형저장탱크의 원활한 보급을 위한 법적 기준 완화, LPG와 LNG간 균형적인 정책 추진 등을 통해 사업을 뒷받침해야 할 것이다.

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Stability Analysis of LNG Storage Tank with Ground Freezing (LNG 저장탱크의 기초 지반 동결시 안정성에 대한 평가)

  • Shin, Eun-Chul;Kim, Soo-Wan;Park, Jung-Jun
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.1218-1231
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    • 2008
  • Recently the energy dependence of LNG resource is being increased. So the enlargement of LNG storage is constructed in the coastal area. Most of LNG tanks are constructed below the ground level, and thus the hydraulic uplift pressure could be a problem against the weight of tank structure. Specifically, the settlement of foundation soil in the LNG tank is also important in the aspect of safety. The low temperature around LNG tank is induced the ground freezing and hence increasing the soil volume and earth pressure. The additional lateral earth pressure due to ground freezing could be applied to the LNG tank. In this study, the stability of LNG storage tank was evaluated with consideration of freezing earth pressure by using computer program TEMP-W.

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Study on the Fire Safety Estimation for a Pilot LNG Storage Tank (PILOT LNG저장탱크의 화재안전성 평가에 관한 연구)

  • 고재선;김효
    • Fire Science and Engineering
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    • v.18 no.3
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    • pp.57-73
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    • 2004
  • Quantitative safety analysis through a fault tree method has been conducted for a fire broken out over the spilling LNG from a pilot LNG tank, which may have 4 types of scenarios causing potentially risky results. When we consider LNG release from venting pipelines as a first event, any specific radius of Low Flammable Limit(LFL) has not been built up. The second case of LNG outflow from the rupture of storage tank which will be the severest has been analyzed and the results revealed various diffusion areas to the leaking times even with the same amount of LNG release. As a third case LNG leakage from the inlet/outlet pipelines was taken into consider. The results showed no significant differences of LFL radii between the two spilling times of 10 and 60 minutes. Hence, we have known the most affecting factor on the third scenario is an initial amount of LNG release. Finally, the extent of LFL was calculated when LNG pipelines around the dike area were damaged. In addition, consequence analysis has been also performed to acquire the heat radiation and flame magnitude for each case.

Study on the Brittle Crack Arrest Property for 9% Ni Steel by Duplex ESSO test (Duplex ESSO 시험법에 의한 9% Ni강 취성 균열정지 특성 연구)

  • Kim, Young Kyun;Oh, Byung Taek;Yang, Young Chul;Yoon, Ihn soo;Kim, Jae Hoon
    • Journal of the Korean Institute of Gas
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    • v.24 no.6
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    • pp.47-54
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    • 2020
  • A brittle fracture is one of the source of structural damage and can bring a fatal accident. The inner shell of LNG storage tank should be designed and applied to construction by ensure that no brittle crack will occur under -162℃ condition. In point of view of fracture mechanics brittle fracture in the structure could be referred as crack initiation and crack arrest. It should be designed no crack initiation. However, in the unlikely event of a brittle fracture occurring, a back-up function of arresting the brittle crack should be included for the design. In this paper investigated the characteristics of 9% Ni steel thick plates of having a capability of arresting brittle cracks under the thickness of 33 mm, 37mm, 40 mm. First, charpy test has performed to evaluate the fundamental brittle impact fracture property of 9% Ni steel under the temperature of 24℃, -162℃ and -196℃. In addition, Duplex ESSO tests were also performed under -196℃ to evaluate the capability of crack arrest for 9% Ni steel. From the experiments results, it was confirmed that all the thickness of 9% Ni steel plates exhibits sufficient brittle crack arrest fracture toughness for the application of LNG storage tank as a inner shell.

An Examination on the Dispersion Characteristics of Boil-off Gas in Vent Mast Exit of Membrane Type LNG Carriers (멤브레인형 LNG선박 화물탱크 벤트 마스트 출구에서의 BOG 확산 특성에 관한 연구)

  • Kang, Ho-Keun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.19 no.2
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    • pp.225-231
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    • 2013
  • Liquefied gas carriers generally transport cargoes of flammable or toxic nature. Since these cargoes may cause an explosion, fire or human casualty, the accommodation spaces, service spaces and control stations of liquefied gas carriers should be so located as to avoid ingress of gas. For this reason, the paragraph 8.2.9 of IGC Code in IMO requires that the height of vent exits should be not less than B/3 or 6 m whichever is greater, above the weather deck and 6 m above the working area and the fore and aft gangway to prevent any concentration of cargo vapor or gas at such spaces. Besides as known, the LNG market has been growing continually, which has led to LNG carriers becoming larger in size. Under this trend, the height of a vent will have to be raised considerably since the height of a vent pipe is generally decided by a breadth of a corresponding vessel. Accordingly, we have initiated an examination to find an alternative method which can be used to determine the safe height of vent masts, instead of the current rule requirement. This paper describes the dispersion characteristics of boil-off gas spouted from a vent mast under cargo tank cool-down conditions in the membrane type LNG carriers.

Interpretation for Band-Type Indication on Radiography of 9% Ni Steel Welds for LNG Storage Tanks (액화천연가스 저장탱크 9% 니켈강 용접부의 방사선투과시험 필름에 나타나는 밴드형상의 지시 해석)

  • Lee, Seung-Hyun;Lee, Seung-Rim;Lee, Young-Soon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.5
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    • pp.479-483
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    • 2010
  • 9% nickel alloy steels used for LNG, cryogenic liquid, storage tank are welded with dissimilar Inconel or Hastelloy welding rod and the weldment shows similar characteristic with the dissimilar metal weld of low carbon steel and austenitic stainless steel. Band type indications are sometimes shown on the film during radiography test of the weldments. Thus this study identified whether the indications are non-relevant indications through material, radiographic test, ultrasonic test, liquid penetrant test and microstructure analysis and also proposed radiography film interpretation and cause of band type indications.