• Korean Chemical Engineering Research
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• 제62권1호
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• pp.70-79
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• 2024

라만분석기는 분자가 가지는 고유 진동에 빛을 조사하여 발생하는 빛의 산란이 생기는 "라만효과"를 이용하여 분자 구분과 성분 분석을 할 수 있는 분석기로, 천연가스 산업에서도 LNG(액화천연가스) 수출 및 수입 기지 외에 벙커링 및 탱크로리 분야에서도 폭 넓게 사용 중이다. 본 연구에서는 실제 현장 조건하에서, LNG 성분 분석 및 주요 물성(발열량, 기준밀도 등)을 산출하기 위해 LNG 수입기지에 라만분석기를 설치, 운영하였으며, 측정된 LNG 성분 및 발열량을 기존 검증되어 운영 중인 가스분석기에 의해 분석된 성분 및 발열량과 비교하였다. 시험 결과 라만분석기는 매우 빠르고 안정되게 LNG 성분 및 발열량을 측정하였으며, LNG 거래의 기준이 되는 발열량을 기존 가스분석기 결과값과 비교시에도 적정 오차 기준 내에 있는 것을 확인하였다. 추가적으로 본 연구를 통해 얻은 측정 결과는 관련 표준(ASTM D7940-14)의 정확도 기준을 만족하였고, 국외 대규모 실증 사례와의 비교 시에도 유사한 결과를 산출하였다.

• Journal of Welding and Joining
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• 제14권1호
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• pp.99-106
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• 1996

Development of an automatic TIG welding system incorporating a vision sensor and torch control mechanism leads to an improved welding quality and greater production efficiency. The automatic welding system should be greatly restricted in its size and weight for the LNG(Liquefied Natural Gas) storage tank and also provide a unique torch rotating mechanism which keeps the torch tip in the constant position while the angle is changed continuously to maintain the welding torch substantially perpendicular to the weld line. The developed system is driven by two translation axes X, Z and one rotational axis. A moving line window method is adopted to the image recognition of the corrugated membranes with specular reflection. This method decides original laser stripe patterns in image which is affected by multi-reflection. A self-teaching algorithm, which guides the automatic welding machine with the information provided by the CCD camera without any previous learning of a reference trajectory, was developed for tracking the corrugated membrane of the LNG tank along the weld line.

• Journal of Advanced Marine Engineering and Technology
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• 제39권10호
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• pp.1054-1061
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• 2015

The International Maritime Organization (IMO) has been regulating emissions by making mandatory the compliance with institutions aimed at protecting air quality such as the Energy Efficiency Design Index (EEDI), Ship Energy Efficiency Management Plan (SEEMP) and Tier III. Under the circumstances, one of the response measures considered to be the most feasible is the replacement of existing marine fuel with Liquefied Natural Gas (LNG). The industry has been preemptively building infrastructure and developing and spreading engine technology to enable the use of LNG-fueled ships. The IMO, in turn, recently adopted the International Code of Safety for Ships Using Gases or Other Low-Flash-Point Fuels (IGF Code) as an institutional measure. Thus, it is required to comply with regulations on safety-related design and systems focused on response against potential risk for LNG-fueled ships, in which low-flash-point fuel is handled in the engine room. Especially, the Standards of Training, Certification and Watchkeeping (STCW) Convention was amended accordingly. It has adopted the qualification and training requirements for seafarers who are to provide service aboard ships subject to the IGF Code exemplified by LNG-fueled ships. The expansion in the use of LNG-fueled ships and relevant facilities in fact is expected to increase demand for talents. Thus, the time is ripe to develop methods to set up appropriate STCW training courses for seafarers who board ships subject to the IGF Code. In this study, the STCW Convention and existing STCW training courses applied to seafarers offering service aboard ships subject to the IGF Code are reviewed. The results were reflected to propose ways to design new STCW training courses needed for ships subject to the IGF Code and to identify and improve insufficiencies of the STCW Convention in relation to the IGF Code.