• 한국마린엔지니어링학회:학술대회논문집
• /
• 한국마린엔지니어링학회 2005년도 전기학술대회논문집
• /
• pp.1041-1046
• /
• 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.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
• /
• pp.166.2-166.2
• /
• 2005

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2005년도 추계학술대회 논문집
• /
• pp.89-92
• /
• 2005

특수선은 일반화물과 달리 적$\cdot$양하를 위한 준비가 순차적으로 이루어져야 하며 LNG 및 LPG 운반선은 화물이 극저온 혹은 고압이라는 특성 때문에 고도의 안전성이 요구된다. 또한 인명 안전 및 해상환경 보호를 위해 액화물 취급의 중요성을 인식하면서도 과학적인 장비를 이용한 교육 ·훈련의 관심 부족 및 제도적 지원책이 미비하여 현재까지 해양교육기관에 설치된 장비는 거의 없는 상태이며 그나마 보유하고 있는 장비도 노후되어 원활한 교육$\cdot$훈련이 어려운 실정이다. 따라서, 본 논문에서는 본 연구는 특수선 특히 LNG선박의 적양하 작업을 시뮬레이션 할 수 있는 교육시스템을 개발하는 것이다.

• 대한기계학회논문집A
• /
• 제27권3호
• /
• pp.393-400
• /
• 2003

Excessive generation of BOG during the LNG transportation not only causes the severe financial loss but also leads to the unexpected disaster. Therefore, the carrier cargo insulating interior LNG should be carefully designed based upon an accurate heat transfer analysis. However. it is not simple to analyze heat transfer of LNG cargo, because it is in a complex insulation structure and LNG carrier experiences a complicated heat transfer according to various kinds of voyage conditions. In this paper, we carried out the transient finite element heat transfer analysis for a cargo of Mark-111 membrane-type LNG carrier during laden voyage, and we compared heat transfer rates between considering natural convection and considering conduction. For this goal, we developed a PCL program incorporating with a commercial MSC/NASTRAN FEM code.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2011년도 정기 학술대회
• /
• pp.557-560
• /
• 2011

In the present paper, the sloshing resistance performance of an LNG carrier insulation system is evaluated by fluid-structure interaction (FSI) analysis. For this analysis, the arbitrary Lagrangian Eulerian (ALE) method is adopted to accurately calculate the structural behavior induced by internal LNG motion of a KC-1 type LNG carrier cargo tank. In addition, the global-local analysis method is introduced to reduce computational time and cost. The global model is built from shell elements to reduce the sloshing analysis time. The proposed novel analysis techniques can potentially be used to evaluate the structural integrity of LNG carrier insulation systems.

• Journal of Advanced Research in Ocean Engineering
• /
• 제3권3호
• /
• pp.112-124
• /
• 2017

As an LNG carrier preserves and transports liquefied natural gas under minus $163^{\circ}C$, the cargo tank has to have sufficient hull strength against not only the wave loads but also against loads caused by loading and unloading and thermal expansion to keep the LNG safely. The main insulation types for a CCS are No.96 and Mark III from GTT for the membrane LNG carrier. Particularly, the invar membrane plate in No.96 is very thin and its connections could experience high local stresses owing to such dynamic loads. Therefore, it should be verified whether those connections have sufficient fatigue lives for the purpose of operation and maintenance. This research aims at performing fatigue analysis with 0.1 fatigue damage criteria for 40 years of design life to support new membrane CCS development using proper S-N curves and the associated finite element modeling technique for each connection and then propose a reasonable design methodology.

• Journal of Advanced Marine Engineering and Technology
• /
• 제22권6호
• /
• pp.854-861
• /
• 1998

The demand of LNG as a cheap and clean energy which does not cause an environmental problem has sharply been increased in Korea. In general LNG is stored in a cargo tank specially designed as a liquid state below $-162^{\circ}C$. The main engine of a LNG carrier is generally a steam boiler because LNG is a highly flammable fluid with the possibility of explosion. The main engine of a cargo ship has to be capable of the propulsion load and various auxiliary loads for the safe navigation since it is the primary energy source. Therefore the evaluation of a main boiler's energy capacity is a key design point in the planning of LNG carrier's construction. This research is to develop the computational program for the analysis of steam boiler Heat balance for LNG carrier.

• 대한조선학회 특별논문집
• /
• 대한조선학회 2007년도 특별논문집
• /
• pp.89-93
• /
• 2007

The Boil-off gas (BOG) generation during the voyage is inevitable since Natural Gas (NG) in normally liquefied below -160 degree C in atmosphere condition and small heat ingress due to relatively hot outside keeps evaporating continuously. The one of major issue in LNG carriers is to handle generated BOG from cargo tank. The generated BOG affects to increase the cargo tank pressure and Gas Management System (GMS) for LNG carriers is closely related to cargo tank pressure maintenance. Economically, BOG is generally used as fuel in LNG carrier. Newly developed GMS for LNG carrier in boiler propulsion system, VaCo System, not only accomplish automatic control in GMS but also ensure safer operation.

• Journal of Ship and Ocean Technology
• /
• 제12권1호
• /
• pp.35-44
• /
• 2008

As arctic energy resource is attracting public attention, arctic shipping market will also be growing in large as expected to increase in LNG trade from Arctic area to the western countries by shipping. During the voyages through such routes, collision with icebergs may be possible. In the present report, ice collision analyses are carried out from a practical point of view to verify the safety of hull structural strength of LNG carriers equipped with GTT $MKIII^{TM}$ membrane type cargo containment system. From the results of collision analyses and the operation-friendly design concept of no-repairing of cargo containment system, a safe operating envelope against ice collision is proposed for LNG carriers of membrane type cargo containment system. Based on the currently proposed safety criteria, it is concluded that LNG carriers with membrane tank type can operate safely with regard to the integrity of CCS in regions where collision between LNG carrier and iceberg is expected.

• 대한조선학회논문집
• /
• 제34권4호
• /
• pp.108-118
• /
• 1997

LNG운반선은 일반 상선과는 달리 경제성 관점에서의 적정 Boil-Off Rate(BOR)과 안전성 관점에서의 Steel Grade 결정을 위한 Cargo tank 온도분포 해석이 필수적이다. Membrane형 LNG선의 경우 이미 여러가지 해석이 수행된 바 있지만 대부분이 상당히 영향을 주는 부재들의 영향을 무시하였다. 본 연구에서는 이전의 연구에 더하여 온도 분포 해석에 가장 중요한 대류 열전달 계수의 산정에 더욱 정확한 상관식을 적용하였고 Longitudinal과 Floor등 주요 부재의 영향을 충분히 고려한 3차원 온도분포 해석과 BOR을 산정하는 program을 개발하였다. 또한 여러 가지 경우에 대해 타당성을 검토한 후 그 결과를 설계에 반영하였다.