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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Institute of Gas
Journal Basic Information
Journal DOI :
The Korean Institute of GAS
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Volume & Issues
Volume 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Apr 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
Selecting the target year
Effect of Sedimentation Depth and Water Depth on the Integrity of River Crossing Pipeline
Baek, Jong-Hyun ; Kim, Young-Pyo ; Kim, Woo-Sik ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 1~6
River crossing pipelines have been being operated with buried depth of 1.2~4m underneath river bottom to prevent buoyance and external impact. River crossing pipelines have to show resistance to soil load and hydrostatic pressure. In this study, structural integrity of the river crossing pipeline subjected to soil load and hydrostatic pressure was evaluated by using FE analyses. Hoop stress increased with increasing buried depth under identical water height in case of without concrete encasement, however, hoop stress decreased with increasing water height under identical buried depth.
Potential of Fuel Stratification for Reducing Pressure Rise Rate in HCCI Engines
Lim, Ock-Taeck ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 7~14
This study investigated the effect on reducing the pressure rise rate(PRR) in HCCI Engine by the variation of mixing ratio in the pre-mixture of DME and n-Butane that has different auto-ignition characteristics. In addition to measure of gas pressure in the engine cylinder, chemiluminescence image using the optical accessible engine and numerical analysis with multi-zones model were used to assess the combustion at each local area in the combustion chamber. The maximum PRR changes depending on mixing condition of DME and n-Butane. When DME is stratified and n-Butane is distributed uniformly, maximum PRR becomes lowest which is about 0.25MPa/ms and it corresponds to 5deg. retarding of CA50.
A Study on the Durability Performance of a Receptacle for CNG Vehicles
Choi, Young ; Kim, Young-Min ; Lee, Yong-Gyu ; Lee, Jang-Hee ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 15~20
Compressed Natural Gas (CNG) buses have been supplied since the year 2000 in order to resolve severe atmospheric pollution in metropolitan area and contributed on the improvement of urban atmospheric environment. However, it is indispensible to take an adequate measure to guarantee the safety of CNG vehicles because of the possibility of huge fire accident. A receptacle, connecting device between high pressure fuel supply tank and fuel line, plays an important role in CNG supply system. In recent, leakage of CNG from receptacles has been reported. So, the concern about the security and reliability of receptacles has been arisen. Therefore, a lot of efforts to prevent leakage are invested among researchers and the durability of this component should be guaranteed despite repeated operation. This research has performed durability tests of a CNG receptacle regarding the repeated usage, extreme chattering, and continuous full flow test. Although a receptacle used for CNG vehicle satisfies validation requirements in the test results, it has been found that failure in the function of leakage prevention in a receptacle could take place in the case of prolonged exposure to high supply pressure in common quick charging environment on site.
Development of LNG Terminal Flow Rate Data Reconciliation Method
Lee, Sang-Ho ; Lee, Chul-Jin ; Lim, Young-Sub ; Park, Chan-Saem ; Han, Chong-Hun ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 21~26
Especially in Korea, LNG terminals commonly have huge scale because of the high demand of natural gas, and for the safe operation of terminal wide observation on temperature is necessary. That is the reason why the terminal has thermometer all over the facility but another information, flow rate, is insufficient. By the way, in pipeline, temperature difference is highly related with flow rate and with some simple assumptions, we can estimate flow rate. And through the steady state data reconciliation, the flow rate data become more reliable. In this research, we will study about flow rate data reconciliation method for LNG terminal and case study.
A Study on the District Community Cooling System using LNG Cold Energy
Kim, Chung-Kyun ; Kim, Seung-Chul ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 27~30
This paper presents the system design process of district community cooling system using LNG cold energy. The newly developed LNG cooling system includes several heat exchangers, LNG storage tank, thermal mass storage tank, several cold energy storage tanks, gas air-conditioners, compressors, constant pressure regulators, cold energy and hot energy supply pipes. In addition, the gas air-conditioner system is installed to supply not sufficient cold energy due to low level of city gas consumptions during a summer period. This system design is very effective and safe to supply cold energy mass of fresh air by exchanging two thermal masses of an air and 200kcal/kg cold energy of LNG. The district community cooling system with LNG cold energy does not produce CO2 and freon gases in the air.
Simulation of Heat and Smoke Behavior for Wood and Subway Fires by Fire Dynamics Simulator(FDS)
Sonh, Yun-Suk ; Dan, Seung-Kyu ; Lee, Bong-Woo ; Kwon, Seong-Pil ; Shin, Dong-Il ; Kim, Tae-Ok ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 31~37
In this study, to propose the analysis method of heat and smoke behavior of fire using the CFD-based fire simulator FDS, comparison of the simulation results against the experimental results and the sensitivity of the results to the grid sizes have been investigated. For the wood fire, thermal images captured from the experiments were compared against the FDS simulations, and the maximum temperatures agreed in~4.3 % error, showing the applicability of FDS in the interpretation of the fire phenomena. In the aspect of the sensitivity to the grid size for the subway fire, FDS results of smoke temperature, CO concentration and visibility converged and showed no distinct changes for the grid size <
, guaranteeing that the FDS fire model set in this research could interpret the fire phenomena successfully.
The Hydrogen Behavior of Surface Layers of High Strength DP Thin Sheet Steels for Automobile
Park, Jae-Woo ; Kang, Kae-Myung ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 38~43
According to the lack of resources and the stringency of environmental regulations, a study of the high strength thin plate sheet steels for automobile have been become an important issue for automobile industry. However, the problem of hydrogen embrittlement of high strength sheet steels was concerned with the degradation of mechanical properties. Therefore, we studied the hydrogen behavior of surface layers of 590MPa DP sheet steels on development using by relationship the microstructure of subsurface and the distribution of micro hardnesses. Hydrogen was charged into the specimens using by the cathodic electrolytic method. The behavors of under surface layers were investigated by the observation of microstructures and the micro vickers hardness test with the amount of hydrogen charging with hydrogen charging conditions.
Evaluation of the Seismic Integrity of a Centrifugal Pump using Response Spectrum Analysis
Choi, Myung-Jin ; Yoo, Ji-Woo ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 44~50
Vibration responses of a centrifugal pump required dynamic analysis for seismic qualification, were calculated by using spectrum analysis, which is known to be very simple compared with time domain analysis. Modal analysis was performed and the results were utilized in the spectrum analysis. The vibration responses calculated from the spectrum analysis were more conservative than those from the time domain analysis, that is, the former can be used as safer in design process. The pump was qualified for the specified seismic service conditions as specified in IEEE 344-1987. The maximum stresses were less than allowable stress limits. Based on the analysis results, it is concluded that the pump meets all the dynamic requirements of the applicable codes, standards, and technical specification.
A Study on Accidents of Buried Pipeline Crossing River
Ma, Young-Wha ; Kim, Ji-Yun ; Yoon, Kee-Bong ; Do, Young ;
Journal of the Korean Institute of Gas, volume 14, issue 6, 2010, Pages 51~56
Records of accidents for buried pipeline across the river were gathered and causes were analysed. The results are intended to be utilized as basic data for determining a reasonable criteria for the depth of buried city gas pipeline crossing the river. Accident of river-crossing buried pipeline was mainly caused by flood. Sometimes corrosion was detected at the failed location of the pipe. In order to determine reasonable and efficient depth of burial of the pipeline, hydraulic evaluation of the river and structural analysis of the pipeline are necessary. Published data for the buried natural gas pipeline incidents were also investigated and summarized. Main causes of buried natural gas pipeline incidents were external interference and corrosion. However, the two main causes of incidents showed significant difference in the proportion of the entire incident, depending on burial environment.