• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2010.04a
• /
• pp.415-416
• /
• 2010

Recently, development and using a range of natural gas is widening because anxiety of oil supply is increasing. Especially, around the world, development for Storage and transportation of natural gas is rapidly growing. On the other hand, in Korea because of technology loss for cryogenic part material, key component is rely on import. LNG and LPG are the future core of natural fuels. That are getting a lot of support and it have increased the frequency of use. So it should be associated with the development of technology. And key technology about design and manufacturing for cryogenic butterfly valve are secured. In this paper, we analyze the strength evaluation for circumference pressurization type cryogenic butterfly valve using the fluid-structure analysis.

• Journal of the Korean Institute of Gas
• /
• v.21 no.6
• /
• pp.15-22
• /
• 2017

The pressure safety valve is very important device for securing the safety in the facilities which is operated by high pressure gases. The performance test should be periodically inspected by relate law because the failure of pressure safety valves might be main causes of serious accidents in the industrial fields. Shop test is mainly use for inspecting the performance test of pressure safety valves but the test method is not to be a solution for securing the safety. So, the development of alternative method is required. In this paper, there is a limit to securing the safety if the performance test is with just shop test. The limitation is checked from analysis result based on performance test results of pressure safety valves. The necessity for introducing the in-service test is reviewed to surmount the limitation. As a result, in-service test method should be developed and introduced to improve the inspection efficiency and economical loss. Also, it can be reduce the risk level.

• Journal of Convergence for Information Technology
• /
• v.8 no.6
• /
• pp.389-397
• /
• 2018

Recently, Global Shale gas development has expanded, increasing shale gas production has transformed the energy market.As a result of the reduction of energy facilities, in order to overcome the management deterioration of domestic casting valve industry and enter the enlarged shale gas plant, tried to confirm the SWOT factor through the second questionnaire based on the questionnaire survey of related industry experts and previous studies. As a strength-strategy, presented three factors besides collaboration with domestic companies, suggested four factors including product development specialized in shale gas plant as a weakness complement. Thesis offer to scholarly-Practical implications, Internal-external environmental factors, strategization for entering New energy market. thesis offer to scholarly, Practical implications, environmental factors, strategization for entering New energy market. After, analyze a important of research strategy, would like to study the impact on the company according to the ranking of importance.

• 한국가스학회:학술대회논문집
• /
• 2006.11a
• /
• pp.81-89
• /
• 2006

• 한국가스학회:학술대회논문집
• /
• 1998.09a
• /
• pp.89-94
• /
• 1998

• 한국가스학회:학술대회논문집
• /
• 1999.09a
• /
• pp.34-40
• /
• 1999

• Spatial Information Research
• /
• v.12 no.1
• /
• pp.89-100
• /
• 2004

Nowadays, the gas utilities have been increasing constantly due to the expansion of the urban areas. Using computerized information database, the gas companies have developed a gas management system in order to maintain the current status. However, this system can only give basic functions of the maintenance and management of the gas facilities and it has no proper utilities to provide information against accidents from gas leaks. Therefore, a gas accident management system has been developed in this study. Through primary and secondary pipe searching algorithm realtime based management system was devised against gas leaks to propose proper actions. In addition, supporting decision making has been enabled providing estimated maximum amount of gas leaks. Furthermore, all the residential units could be identified thereby minimizing damages through early warning. This system can be expected to contribute to enhance the efficiency of the gas management not to mention of protecting human lives and properties of the nation.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
• /
• 2002.11a
• /
• pp.147-152
• /
• 2002

본 연구에서는 검증된 Bench급 석탄 가스화 공정에 대하여 개발된 동적모사 프로그램을 중잔유 가스화 공정 모델에 적용하여 가스화 성능에 크게 영향을 미치는 주요변수, 즉 시료 투입비, 산소 공급비, steam 공급비 및 압력조절밸브 열림궤도의 영향을 파악하고, 공정변수들의 동특성을 해석하였다. 가스화기의 부하변동에 따른 주요 공정 변수들의 변동경향 및 시상수에 대한 신뢰성 있는 모사결과를 얻을 수 있었으며, 개발된 모델을 사용하여 중잔유 가스화 공정설계를 위한 기초 자료를 마련하였다.

• Journal of the Korean Institute of Gas
• /
• v.19 no.3
• /
• pp.9-17
• /
• 2015

Almost all of the natural gas consumed in South Korea is compressed into very high pressure for the transportation through the underground pipelines, then reduced in pressure regulation stations before delivery to the consumer. For pressure reduction, expansion valves have been used due to the simple and effective installation, but recover none of the energy in the gas during compression. Hence, turbo-expanders are proposed instead of the valves to accomplish the same pressure letdown function and recover some of the compression energy in the form of shaft work converting into electric powers. Here we have theoretically calculated the electric powers at the pressure reduction from 68.7 bar to 23 bar (which are the average values taken at the inlet and outlet points of the expansion valve in medium-pressure regulation stations) according to the inlet conditions of temperature and flow rate. The natural gas is considered as two cases of a pure methane and the mixture of hydrocarbons with a very small amount of nitrogen, and the Peng-Robinson equation of state is employed for the calculation of required thermodynamic properties. The electric energy is recovered as much as 1596 MW(methane) and 1567 MW(mixture) based on the total supply of natural gas in 2013.

• Journal of the Korean Institute of Gas
• /
• v.22 no.2
• /
• pp.72-77
• /
• 2018

This paper presents the FEM analysis results on the strength safety of LPG fuelling nozzle, which is composed of ball valve and long cylinder tube. For the strength safety analysis of LPG fuelling Nozzle, the gas pressure of 0.5~3.5MPa has been supplied to the ball valve and long cylinder tube bodies with the wall thickness of 1.7~3.5mm. The maximum von Mises stress of the ball valve with 1.7mm wall thickness is 25.4MPa for the supply gas pressure of 3.5MPa, which is 25.9% compared with that of the yield stress of the brass. And the maximum von Mises stress was 23.7MPa when a 3.5MPa gas pressure was applied to a long cylinder tube with a wall thickness of 1.7mm, which was 6.7% more safe than the ball valve which was analyzed under the same conditions. For the increased wall thickness, 2.0mm of the long cylinder tube, the maximum von Mises stress of 20.2MPa is 14.8% more safe compared with that of 1.7mm wall thickness of the same cylinder tube. Thus, the wall thickness of the ball valve and cylinder tube is recommended as an optimized thickness of 1.7~2.0mm for the strength safety of the LPG fuelling nozzle.