• Journal of the Korean Institute of Gas
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• v.19 no.6
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• pp.80-84
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• 2015

In this paper, the valves for a LPG gas cylinder have been investigated on the body height and weight by comparing design data between typical automatic shut-off vertical and newly developed horizontal valves. The height of an automatic shut-off horizontal valve is radically reduced by 41~42% compared with that of a typical automatic shut-off vertical valve. And, the body weight of a horizontal valve is also reduced by 29~40% compared with that of a vertical shut-off valve. This result is just achieved by a structural design modification from typical vertical valve to horizontal arrangement of various valve components.

• Proceedings of the Safety Management and Science Conference
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• 2004.11a
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• pp.53-60
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• 2004

본 연구에서는 현재 일반가정이나 영업소에서 사용중인 액화석유가스 용기용밸브의 문제점을 제시하고, L.P 가스사고를 예방할 수 있는 LPG용 과류밸브의 과류차단장치를 개발${\cdot}$제작함에 있어 고압가스 안전관리기준 통합고시 ${\lceil}$제12장 4절 과류차단형 액화석유가스 용기용밸브${\rfloor}$에서 규정한 과류차단 성능시험을 실시하는데 필요한 여러 가지 변수를 선정하여 차단장치의 형상에 따른 최적의 차단 유량 범위를 찾고자 실험을 실시하였으며, 보다 궁극적으로는 일반 용기용밸브가 가진 문제점을 조속히 해결하고 진정한 의미의 안전밸브를 개발하는데 목적이 있다.

• Journal of the Korean Society of Safety
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• v.20 no.2 s.70
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• pp.158-161
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• 2005

This research is about overflow cutoff valve for liquefied petroleum gas cylinders. This valve was developed based on Bernoulli's equation and Newton's equation. The structure of overflow cutoff valve was made by insert module instead of the ordinary valve that is used at present. Recently, the increase in use of gas for fuel in houses has resulted to more frequent occurrences of gas related accidents. In Korea, the government has made a law for the obligatory use of the cutoff valves. This cutoff valve is not ya developed. This research focuses on the use of over flow cutoff valve for LPG cylinders. If this valve is adapted, many accidents can be prevented.

• Journal of the Korean Institute of Gas
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• v.9 no.2 s.27
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• pp.38-42
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• 2005

This study introduced concept of safety valve about development of valve for LP gas cylinders. LP gas cylinders are used more because of convenience of use, but a lot of accidents are occurred. Specially, it is used by purpose to injure glossary or others and is sometimes used to a demonstration tool. Korean government was making mandatory to use overuse cutoff valve to reduce accident, but it is real condition that product development is not following. In this study, introduce concept of safety valve that introduce more original safety concept than overuse cutoff valve. This was developed by method that insert module to present use valve and flowing of gas is controlled in state that hose or regulator un-connects to valve. Also, flowing of gas cut-off immediately if hose is cut or occurrence of overuse is produced even if is using normally.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2002.11a
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• pp.105-109
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• 2002

최근 빈번하게 발생되고 있는 가스사고는 많은 인명과 재산상의 손실을 초래하고 있다. 특히 도시 가스 보다는 공기보다 비중이 큰 LP가스에 의한 사고가 많이 발생된다. 특히 최근에 발생한 인천 부평구의 LP가스 폭발사고는 사망6명, 부상21명 등 총 27명의 인명피해와 주택 붕괴 등 많은 재산상의 손실을 초래하였다. 또한 LP가스 용기는 용기자체가 자해나 위해의 수단으로 이용되기도 한다. 이에 따라 정부에서는 1998년 1월 10일 고압가스안전관리법 시행규칙을 개정하여 LP가스용기에 부착되어 사용되는 밸브를 과류차단형으로 의무화하여 가스사고예방을 위해 힘쓰고 있다.(중략)

• Journal of Korean Institute of Fire Investigation
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• v.4 no.1
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• pp.82-85
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• 2004

본 연구는 가스사고의 전형적이고 대표적인 폭발사고와 관련하여 LP가스용기밸브 압력정기, 중간밸브(볼밸브) 및 염화비닐호스로부터의 가스누출량이 어느 정도 되는지에 대하여 이론적으로 계산한 가스누출량과 실제 가스누출량에 대하여 실험을 통하여 연구함으로서 체적공간에서의 폭발과정과 점화원 및 사고경위를 조사하는데 중요한 자료로 활용하고 의도적이거나 취급 또 시공상의 부주의에 의한 가스누출 발생시 사고당시 가스누출량을 확인하는데 활용하고자 연구하게 되었다.

• Journal of the Korean Institute of Gas
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• v.10 no.4 s.33
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• pp.23-28
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• 2006

This paper presents the strength safety and the weight reduction analysis of nine gas valve models for a LPG cylinder using a finite element analysis program, MARC and Taguchi's experimental method. The maximum Von Mises stress of a gas valve body represents a safety of a brass valve structure for the given gas pressure of $91kg/cm^2$, which considered a safety factor of a LPG gas cylinder. The weight reduction analysis is very important for reducing a gas flow friction loss and a manufacturing cost as a design parameter. The calculated results present an design model 9 as an optimized design data with 10mm radius of a lower part gas flow pipe A, 6mm radius of an upper part gas flow pipe B and a connecting length 2 mm of tapered pipe D between lower and upper pipes.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.98.1-98.1
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• 2011

전 세계적으로 대표적인 대중교통으로 천연가스버스가 운행 중에 있으며, 천연가스의 저장을 위하여 대부분의 차량이 복합용기를 사용하고 있다. 또한 친환경자동차로 개발되고 있는 수소연료전지자동차도 수소 저장용으로 복합용기를 적용하여 상용화를 추진 중에 있다. 복합용기의 상용화가 증가하면서 복합용기의 안전성 확보가 가장 중요한 이슈가 되고 있다. 기체상태의 고압가스를 교통수단에 적용하기 위하여, 저장매체인 고압복합용기의 안전성 및 기술 확보를 위한 기술개발과 안전기준의 확립을 위한 기준개발이 미국, 유럽, 일본 등 다수의 국가에서 진행되고 있다. 현재 복합용기의 안전성을 확인하는 기준은 각 나라의 기준에 따라 진행되고 있으며 천연가스자동차용 저장용기 국제표준으로는 ISO 11439가 적용되고 있다. 수소연료전지자동차용 수소용기의 안전기준은 아직 확립되지 않은 상태이며, 개발된 초안으로는 국제규정으로 UN ECE R No.79 및 국제기술표준으로 ISO/TS 15869가 있다. 개발 중인 국제기준 및 국내기준에서 가장 취약한 부분이 화염시험이다. 화염시험은 자동차에 화재가 발생했을 경우 용기의 폭발을 막기 위하여 안전밸브가 정상적으로 작동하는 지를 확인하는 시험이다. 하지만 현재의 시험방법으로는 자동차에서 발생하는 국부적인 화염에 대한 안전성을 확인하기가 어려운 실정이다. 본 연구에서는 국내의 화염시험기준을 개발하기 위해 수행된 화염시험에 대한 결과와 화염시험장치를 제안하고자 한다.

• Journal of the Korean Institute of Gas
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• v.16 no.6
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• pp.73-79
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• 2012

Currently, all domestic CNG vehicles have manual cylinder valves installed. These are inconvenient for drivers in case of a gas leak accident, because drivers have to stop the vehicle operation and manually close the valve. It makes difficult condition for drivers to quickly and properly respond to such accidents. In advanced European countries, they require Automatic cylinder valve installation, which has a structure where the valve is automatically shut off when the driver turns off the ignition in case of a gas leak. If this electric valve system is introduced in Korea, the safety of CNG buses will be improved with better functionalities. In this paper, in order to solve the structural problem of difficulty for a driver to identify the operational status of individual Automatic cylinder valves, an approach was made regarding temperature increase with pressure increase during CNG filling. it was estimated that the temperature increased approximately more than $30^{\circ}C$ due to pressure difference during the filling. Therefore, it was concluded from the experimental data that the valve of the container whose temperature did not increase did not operate, resulting in filling failure.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.20 no.5
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• pp.551-556
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• 2007

High pressure storage of the agent gas in fire suppression system was composed of tank, main valve and safety valve, which prevents the fracture of the high pressure storage. The safety valve has circular thin plate as fracture plate that was destroyed over fracture pressure. When inner pressure of the storage is reached the fracture pressure, the safety valve discharges gas and degrades simultaneously the inner pressure of the storage. There are design variables such as flow path diameter, inner diameter of the plastic packing ring, thickness of plate and fillet radius. In this variables, thickness of plate is set to be a value of 0.2mm. The main effect of variables on the inner pressure, has been decided using factorial design and statistical analysis. Therefore, the relation of variables are expressed by regression equation. It is disclosed results that the difference of fracture pressures between the equation and experiment has $2{\sim}5%$. Finally, using response surface method, the optimal design of the safety valve could be decided with safety pressure of 25MPa, where the fracture occurs on circular thin plate.