LNG 저장 탱크 시스템의 안전 기술

김청균,김영규,홍성호 한국가스학회 1997 가스산업과 기술 Vol.1 No.1

LP가스 서비스업과 제조업의 상생협력 및 산업진흥책

김청균 한국가스학회 2014 한국가스학회 학술대회논문집 Vol.2014 No.6

댐핑안전 구조물을 고려한 완전밀폐식 LNG 저장탱크 시스템의 강도안전성에 관한 유한요소해석

김청균(Chung Kyun Kim),김태환(Tae Hwan Kim) 한국가스학회 2007 한국가스학회지 Vol.11 No.4

코너프로텍션 설치에 따른 멤브레인 LNG 저장탱크 시스템의 응력 및 변형거동 특성에 관한 수치해석

김청균(Chung Kyun Kim) 한국가스학회 2009 한국가스학회지 Vol.13 No.6

본 연구에서는 LNG 저장탱크의 단열재 공간에 설치된 코너프로텍션에 작용하는 응력 및 변형거동특성을 FEM으로 해석하였다. 제시된 코너프로텍션은 기존의 멤브레인식 LNG 저장탱크의 강도안전성과 LNG 누출안전성을 증대시킬 수 있다. LNG 저장탱크 시스템에 작용하는 응력과 변위 거동량을 단열재 상자, 멤브레인 내부탱크, PC 외부탱크에 대하여 해석하였다. 유한요소법으로 계산한 해석결과에 의하면, 내부탱크와 외부탱크 사이에 코너프로텍션을 설치한 새로운 LNG 멤브레인 저장탱크의 응력과 변형 거동량은 기존의 LNG 저장탱크에 비하여 현저하게 줄어드는 경향을 보여주고 있다. 이러한 현상은 LNG 저장탱크 시스템의 강도 안전성이 코너프로텍션을 설치함에 따라서 강성도가 증가하기 때문인 것으로 설명될 수 있다. In this study, the stress and deformation characteristics of corner protection in which is fabricated in an insulation area have been analyzed using a finite element method. The proposed corner protection may increase the strength and leakage safeties of conventional LNG storage system. The stress and deformation of LNG storage tank system are computed for an insulation panel box, membrane inner tank, and prestressed concrete outer tank. The FEM computed results indicate that the stress and displacement of new membrane LNG tank system with a corner protection between an inner tank and an outer tank are reduced in comparison to those of a conventional membrane LNG tank. This is explained that the strength safety of LNG membrane tank system may be increased due to a strength stiffness of a corner protection.

9% 니켈강재식 LNG 저장탱크용 통합제어안전관리시스템에 관한 연구

김청균(Chung Kyun Kim) 한국가스학회 2010 한국가스학회지 Vol.14 No.5

본 연구는 9% 니켈강재식 LNG 저장탱크용 통합제어안전관리시스템을 개발하고자 한다. 새로운 통합제어안전관리 시스템은 기존의 측정 및 제어시스템에 비해 압력, 변위, 하중을 측정할 수 있는 장치를 추가하였다. 또한, 측정된 데이터는 새로운 제어장치와 안전관리 시스템에 의해 통합되고 분석하는 프로세스를 동시적으로 진행하는 것이다. 초대형 완전밀폐식 LNG 저장탱크의 안전성과 효율성을 증가시키기 위해 통합제어안전관리시스템은 압력계이지를 추가하고, 내부탱크의 외측벽과 스티프너, 톱거더의 용접지역, 코너 프로텍션 탱크의 외측벽에 새로운 변위센서/압력센서를 설치하였다. 변위센서와 하중센서는 내부탱크와 코너 프로텍션 탱크의 9% 니켈강재 구조물에 대한 파손징후를 제공할 수 있고, 내부탱크로부터 누설되는 LNG를 감시할 수 있다. 기존의 누설센서는 내부탱크와 코너 프로텍션 사이의 단열지역에 설치한 누설감지기에 의해 경고신호가 접수될 때까지도 9% 니켈강재 탱크의 파괴에 대한 적절한 정보를 제공하지 못한다는데 문제가 있다. 따라서, 새로운 통합제어안전관리시스템은 온도, 압력, 변위, 하중, LNG의 밀도 데이터를 수집하고 분석하기 위한 것으로, 탱크시스템의 안전성과 내부탱크의 누설을 제어하기 위한 시스템이다. 또한, 디지털 데이터는 9% 니켈강재로 제작한 탱크의 안전성에 관련된 변위와 하중, LNG의 액위와 밀도, 쿨다운 공정, 누설, 압력 등을 제어하기 위해 측정한다. This paper presents the development of an integrated control and safety management system for 9% nickel steel LNG storage tank. The new system added the measuring equipment of pressure, displacement and force compared to the conventional measurement and control system. The measured data has simultaneously been processed by integrating and analyzing with new control equipments and safety management systems. The integrated control and safety management system, which may increase a safety and efficiency of a super-large full containment LNG storage tank, added additional pressure gauges and new displacement/force sensors at the outer side wall and a welding zone of a stiffener and top girder of an inner tank, and the inner side wall of a corner protection tank. The displacement and force sensors may provide failure clues of 9% nickel steel structures such as an inner tank and a corner protection, and a LNG leakage from the inner tank. The conventional leak sensor may not provide proper information on 9% nickel steel tank fracture even though LNG is leaked until the leak detector, which is placed at the insulation area between an inner tank and a corner protection tank, sends a warning signal. Thus, the new integrated control and safety management system is to collect and analyze the temperature, pressure, displacement, force, and LNG density, which are related to the tank system safety and leakage control from the inner tank. The digital data are also measured from control systems such as displacement and force of 9% nickel steel tank safety, LNG level and density, cool-down process, leakage, and pressure controls.

무라카미 하루키(村上春樹)의 『1973년의 핀볼(1973年のピンボール)』론

김청균 중앙대학교 일본연구소 2015 日本 硏究 Vol.0 No.38

This article studies the world view shown in the novel Pinball, 1973, one of Haruki Murakami’s early major works. Analysis of this novel gave me an insight into the following. ‘I’, the protagonist and narrator of Pinball, 1973, confronted the world view in the 1960s with that in the 1970s. In this novel, the world view in the 1960s represents a perspective focusing on ‘political power’ and ‘love’. In the meantime, the world view in the 1970s is characterized by ‘loneliness’, that is, a perspective that everyone in this world is fundamentally lonely. In Pinball, 1973, the 1970s is an era set under a new condition of life distinguished from the 1960s. According to the novel, people in the 1970s lived as if they became a part of a machine, losing their personality in a highly-industrialized society. However, ‘I’, the narrator, had a hope to lead a personalized life without losing himself to the system of highly-industrialized society. ‘I’ is a character who overcame allteglichkeit and reflected on his own life. Through such self-reflection, ‘I’ reached a conclusion that it was the order of universe and the life of people that things began from nothing and returned to nothing. And with this in mind, ‘I’ overcame the sadness of losing his girl friend Naoko. Pinball, 1973 shows this mental journey attaining a view of the universe and the world that people’s life is in the universal order of coming from nothing and returning to nothing.

인장강선을 사용한 완전방호식 LNG 저장탱크의 강도안전성에 관한 유한요소해석

김청균(Chung Kyun Kim),김태환(Tae Hwan Kim),김도현(Do Hyun Kim) 한국가스학회 2008 한국가스학회지 Vol.12 No.2

본 논문은 완전방호식 LNG 저장탱크의 9% 니켈강재 내부탱크에 대해 응력 및 변형거동 특성을 FEM으로 해석하였다. 내부탱크의 강도안전성을 확보하기 위해 기존 LNG 저장탱크에 유체정압, 초저온하중 등을 가할 경우, 취약부로 알려진 지역에 인장강선을 설치하였다. 기존의 9% 니켈강재 내부탱크와 내부탱크의 하단부에 인장강선을 설치한 탱크에 대한 FEM 해석결과에 의하면, 새롭게 설계한 내부탱크는 인장강선을 설치하지 않은 기존의 내부탱크에 비해 더 안전한 것으로 나타났다. FEM 해석결과에 따르면, 내부탱크의 강도안전성 향상을 위해 내부탱크의 하단부에 직경 50 mm를 갖는 3~4개의 인장강선을 설치할 것을 권장하였는데, 이것은 결국 내부탱크의 응력 및 변위량을 낮출 수 있다. 따라서, 내부탱크에 인장강선을 설치하는 것은 LNG 저장탱크의 강도안전성 확보를 위해 기존 내부탱크에서 도입한 스티프너와 톱거더를 대체한 또 다른 안전장치로 활용될 수 있다. This paper presents the stress and deformation behaviors of 9% nickel steel inner tank in a full containment LNG storage tank using a FE analysis. For an increased strength safety of an inner tank, the tension cable was fastened around the outside wall of an inner tank, which is known as a weak zone for the hydrostatic pressures, cryogenic temperature loads, and other loadings. Based on the FEM computed results between a conventional inner tank and a inner tank with tension cables around the lower part of the side wall of an inner tank, the redesigned inner tank is more safe than that of the conventional tank without a tension cable. The FEM results recommend 3~4 steel tension cables with a diameter of 50mm for an increased strength safety of the inner tank, which may decrease the stress concentration and deformation near the lower part of the side wall. Thus the tension cable around the inner tank may be used as an alternative safety device compared to the stiffener and the top girder structures for the increased LNG storage tank, especially.

이종재료의 폭발용접특성 해석에 관한 컴퓨터 시뮬레이션

김청균,김명구,손원호 대한기계학회 1993 대한기계학회논문집 Vol.17 No.12

A metallic bond of great strength for the same or dissimilar metals can be produced by the explosive welding. The formation of a metallic jet at the interface between the two impacting plates has been simulated using the numerical hydrocode DYNA2D. The mechanism of explosive welding for the wave formation is also analyzed by the computer simulation technique. The microscopic with the experimentally observed behaviour of the explosive welding. The computer simulations of the explosive welding process have proven especially useful for analyzing the mechanism of metallic bones.

립실의 접촉력 및 온도분포 해석에 관한 연구

김청균,전인기,김종억 대한기계학회 1994 대한기계학회논문집 Vol.18 No.6

Using the finite element method, the contact force, contact band width and temperature distribution of lip seals analyzed for the interference including some nonlinearities such as material nonlinearity, geometrical nonlinearity and nonlinear contact boundary condition. The calculated results showed that the contact stress concentrated on the contact zone between the garter spring and the rubber toward the flex side, the contact edge of lip seals. The high contact forces due to the increased interference separate the sealing gap between the lip edge and the rotating shaft. This may lead to leak the sealed oil.

볼군의 다수 접촉점이 접촉저항에 미치는 영향

김청균,Myshkin,N.K. 대한기계학회 1994 대한기계학회논문집 Vol.18 No.11

The multiple character of the contact interaction and the collective behavior of elementary microcontacts play a significant role in all the processes occurring in the surface layers, including the failure due to friction and wear. The array of metal spheres compressed between flat plates has been used for simulation of the contact behavior of multiple contact of solids under normal loading. An experimental design has been made providing regular array of the spheres at the same size with different spatial order. Measurement of electrial contact resistance has been made using the equipment providing the adequate accuracy in the range of micro Ohms. The data on electrical contact resistance have been compared with theoretical predictions using the multiple contact model of constriction resistance. The effect of single spots number and array on conductivity of contact has been evaluated.