• Title/Summary/Keyword: LNG-Storage Tank

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Analytical study of failure damage to 270,000-kL LNG storage tank under blast loading

  • Lee, Sang Won;Choi, Seung Jai;Kim, Jang-Ho Jay
    • Computers and Concrete
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    • v.17 no.2
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    • pp.201-214
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    • 2016
  • The outer tank of a liquefied natural gas (LNG) storage tank is a longitudinally and meridianally pre-stressed concrete (PSC) wall structure. Because of the current trend of constructing larger LNG storage tanks, the pre-stressing forces required to increase wall strength must be significantly increased. Because of the increase in tank sizes and pre-stressing forces, an extreme loading scenario such as a bomb blast or an airplane crash needs to be investigated. Therefore, in this study, the blast resistance performance of LNG storage tanks was analyzed by conducting a blast simulation to investigate the safety of larger LNG storage tanks. Test data validation for a blast simulation of reinforced concrete panels was performed using a specific FEM code, LS-DYNA, prior to a full-scale blast simulation of the outer tank of a 270,000-kL LNG storage tank. Another objective of this study was to evaluate the safety and serviceability of an LNG storage tank with respect to varying amounts of explosive charge. The results of this study can be used as basic data for the design and safety evaluation of PSC LNG storage tanks.

The Development of Compressive Strength Estimation Equation for LNG Storage Tank using Rebound Hardness Method (반발경도법을 이용한 LNG 저장탱크 콘크리트의 압축강도 추정식 개발)

  • Kim, Jung-Hoon;Kim, Young-Gu;Jo, Young-Do
    • Journal of the Korean Institute of Gas
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    • v.21 no.3
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    • pp.26-32
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    • 2017
  • Outer tank concretes of LNG storage tank are composed of prestressed concrete structures that act as a protective wall. The danger such as the collapse of structures will exist if concrete structures is not secured due to the deterioration. Concrete compressive strength directly related to the safety of structures can be predicted by using estimation equation of compressive strength through rebound hardness test and ultrasonic wave velocity method. But, there is no the estimation equation of LNG storage tank for a relation between NDT data and real strength. In this study, to obtain more accurate real strengths for LNG storage tank, core specimens were sampled from walls of pilot LNG storage tank. The rebound hardness test of general NDT for concrete structures was carried out at each 3 positions for the four areas. The compressive strength estimation equation of LNG storage tank was developed by using the data for rebound hardness test of pilot LNG storage tank and compressive strength test of sampled concrete cores.

Experimental Study of Dynamic Response for Pilot LNG Storage Tank (파이롯트 LNG저장탱크의 동특성 실험연구)

  • Kim, Young-Kyun;Lee, Kang-Won;Hong, Seong-Ho;Kim, Ji-Hoon
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.591-597
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    • 2003
  • The demand of LNG in Korea has dramatically increased since it was first imported in 1986. Thus, more LNG storage tanks are required to meet the growing consumption of LNG. However the design, construction, and analysis of LNG storage facility need highly advanced technology compared to the general structures due to the fluid-structure interaction and the low temperature of LNG. Recently Korea Gas Corporation(KOGAS) constructed a pilot LNG storage tank, and it is in operation to develop and accumulate the core technology. As a part of those objects, the fundamental dynamic test for the pilot tank were performed. For this study, dynamic test were carried out and the dynamic characteristics of the pilot tank were verified and analyzed.

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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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Dynamic Experiment for Mode Shape of Pilot LNG Storage Tank (Pilot LNG저장탱크의 모드 형상 파악을 위한 동특성 실험)

  • Lee Kangwon;Hong Seongho;Kim Young Kyun;Kim Ji Hoon
    • Journal of the Korean Institute of Gas
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    • v.7 no.3 s.20
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    • pp.18-23
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    • 2003
  • The demand of LNG in Korea has dramatically increased since it was first imported in 1986. Thus, more LNG storage tanks are required to meet the growing consumption of LNG. However the design, construction, and analysis of LNG storage facility need highly advanced technology compared to the general structures due to the fluid-structure interaction and the low temperature of LNG. Recently Korea Gas Corporation(KOGAS) constructed a pilot LNG storage tank, and it is in operation to develop and accumulate the core technology. As a part of those objects, the fundamental dynamic test for the pilot tank were performed. For this study, dynamic test were carried out and the dynamic characteristics of the pilot tank were verified and analyzed.

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The Measurement of Real Deformation Behavior in Pilot LNG Storage Tank Membrane by using Strain Gage (스트레인 게이지를 이용한 Pilot LNG 저장탱크 멤브레인 실 변형 거동 측정)

  • Kim, Young-Kyun;Yoon, Ihn-Soo;Oh, Byoung-Taek;Hong, Seong-Ho;Yang, Young-Myung
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.108-113
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    • 2004
  • Korea Gas Corp. has developed the design technology of the LNG storage tank. The membrane to be applied inside of the LNG storage tank is provided with corrugations to absorb thermal contraction and expansion caused by LNG temperature changes. It is very important to measure their thermal strains under LNG temperatures by analytical and experimental stress analysis of the membrane. We have developed a stress measurement system using strain gages and measured the strain during cooldown and storing the LNG. We also analyzed the measured data by comparison with the FEM data. On the basis of these results, we could design and assure the application of the Kogas Membrane to large scale LNG storage.

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Seismic Analysis of LNG Storage Tank (LNG 저장탱크의 내진 해석)

  • Lee, Seung-Pyo;Ha, Sung-Kyu;Koh, Byung-Kab
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.5
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    • pp.1095-1101
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    • 2008
  • In this paper, seismic analysis of LNG storage tank is performed. The analysis models are both pipe and pipe, wall and guide of LNG tank. And equivalent static analysis and response spectrum analysis are applied to these two models, respectively. From the analysis, deflections and equivalent stresses are compared. Results show that response spectrum analysis is more accurate than equivalent static analysis for LNG storage tank.

The Development of Life Evaluation Program for LNG Storage Tank considering Fatigue and Durability (피로 및 내구성을 고려한 LNG 저장탱크의 수명평가 프로그램 개발)

  • Kim, Jung-Hoon;Kim, Young-Gu;Jo, Young-Do
    • Journal of the Korean Institute of Gas
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    • v.21 no.3
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    • pp.39-45
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    • 2017
  • The LNG storage tank as core facility of LNG industry is mainly composed of the inner tank of nikel 9% steel and the outer tank of prestressed concrete. To respond proactively increased risk of structure performance deterioration due to fatigue of the inner tank and durability reduction of the outer tank, life evaluation program for LNG storage tank is needed. In this study, life evaluation program for LNG storage tank was developed to assess fatigue of the inner tank and durability(carbonation and chloride attack) of the outer tank. By defining the main three scenarios in the inner tank, the fatigue life analysis is conducted from structural analysis and Miner's damage rule. Carbonation progress of the outer tank is predicted according to thickness of cover concrete by using carbon dioxide contents and data of penetration depth. To consider a variety of input conditions and a reliability in results of chloride attack, the evaluation of choride attack for the outer tank is constructed through Life-365 program of open source.

Structural Analysis on A Steel Roof LNG Storage Tank (강재 지붕형 LNG 저장탱크 구조안전성평가)

  • Lee, Seung-Rim;Park, Jang-Sik;Lee, Young-Soon
    • Journal of the Korean Institute of Gas
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    • v.13 no.1
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    • pp.40-44
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    • 2009
  • This is a comparative structural analysis for a steel roof LNG storage tank that has some advantages relatively in designing larger scale tanks and construction cost, etc. compared with a conventional concrete roof LNG storage tank as the capacity of LNG storage tanks is bigger. Structural analysis was performed on a 200,000$k{\ell}$ steel roof LNG storage tank and a concrete of the same capacity in condition of three critical load combination cases, a normal operation, a LNG spillage and seismic case by using finite element method. And comparative structural safety evaluation was carried out by using strength ratio in places of concrete wall, foundation and roof with a quantitative method.

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Case Study on Seepage Analysis and Countermeasure Against the Seepage Flow of In-ground LNG Storage Tank (LNG 지하저장탱크의 침투해석 및 용수 대책공법에 대한 사례분석)

  • 신은철;오영인;이상혁
    • Proceedings of the Korean Geotechical Society Conference
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    • 2001.03a
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    • pp.65-72
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    • 2001
  • Since Pyoungtaek thermal power plant began using natural gas in 1986, the annual using volume has rapidly increased and reached 12.7 million tons in 1999. When the natural gas is cooled to a temperature of approximately -162$^{\circ}$C at atmospheric pressure, it condenses to a liquid called liquefied natural gas(LNG). LNG has a special characters such as odorless, colorless, non-corrosive, and non-toxic. So, LNG storage tank, tanker ship, transfer pipelines are required the special storage and transportation systems and technology. The presently operating LNG terminals are Pyongtaek and Inchon terminals. A total of 19 above-ground LNG storage tanks(100 thousand ㎘ grade) are currently in operation with a sendout capacity of 4,360tons/hour. To meet the growing domestic demand of LNG supply, the Inchon receiving terminal is expanding(six in-ground tank) and constructing a third LNG terminal at Tongyong. In this paper, case study on seepage analysis and countermeasure against increasing the seepage volume of in-ground LNG storage tank excavation work is reported. The results of an additional seepage analysis are presented to verify the design seepage volume of assumption section and seepage volume after curtain-grouting in the slurry wall.

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