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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
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Journal DOI :
The Korean Institute of GAS
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Volume & Issues
Volume 5, Issue 4 - Dec 2001
Volume 5, Issue 3 - Sep 2001
Volume 5, Issue 2 - Jun 2001
Volume 5, Issue 1 - Mar 2001
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Automatic Synthesis of Fault Tree Using Object-oriented Unit Modeling
Hwang Kyu Suk ; Hou Bo Kyeng ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 1~8
Fault tree construction for hazard assessment requires so much time and labor, so it is very difficult to be applied to the large scale chemical plant. In this study, for the synthesis of fault tree in chemical processes, the object-oriented knowledge framework is proposed to represent the deviations of process variables in the equipment and cause-consequence relationship with equipment faults. The cause of fault is searched by using the object-oriented modeling of equipments and the connectivity among equipments, and then a fault tree is synthesized. we have discussed the performance of the methodology on nitric acid cooling process to evaluate its effectiveness.
Risk Assessment and Its Application for the POSCO's Batch Annealing Furnace Gas Systems
Kim Y. S. ; Yoo J. H. ; Jeong S. Y. ; Jang E. J. ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 9~13
A complete spectrum of risk assessment including qualitative and quantitative approaches were performed for the POSCO's Batch Annealing Furnace (BAF) gas systems. The purpose of BAF is to enhance the quality of steel by annealing it with either hydrogen/nitrogen mixture gas or pure hydrogen gas. Number of gas leak scenarios were identified to generate frequency of their occurrences. With the hypothetical accident scenarios given, fire/explosion impact studies were performed to estimate magnitude of significant consequences. Several different indices were also presented from which practical safety improvement action items could be established.
Corrosion properties of the 6/4 forged brass for the coupler transferring LPG between tank lorry and LPG station
Kil Seong-Hee ; Kwon Jeung-Rock ; Kim Ji-Yuon ; Doh Jung Man ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 14~21
In order to investigate the damage mechanism of the coupler transferring LPG, microstructural observation and chemical analysis of the couplers operated for the long time in the LPG stations and virgin 6/4 forged-brass corrosion-tested were conducted. Their microstructure was consisted of two phases that bright
precipitates were irregularly dispersed in
matrix. The chemical compositions of oxide layer on the surface of the used coupler were composed of S, C, O, Al, Si, etc. as well as Cu and Zn. In environmental corrosion tests of both
HCl and Mattsson solutions, no apparent deviations in mechanical impact strength of forged-brass was observed. While, in U-bend stress corrosion cracking specimen, some microcracks were observed.
A Study on the Natural Evaporation Capacity of LPG Container
Jo Young-Do ; Kim Ji-Yoon ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 22~29
The number of gas containers and the period of exchanging gas containers are vsy important in designing liquefied petroleum gas(LPG) supply system for small capacity domain. And also the evaluation of remaining LPG in containers to be exchanged is very useful information in commerce. However seldon has been studied on calculating method about those with respect to gas consumption pattern. In this study, a simulation method was developed to estimate the evaporation capacity of LPG container, the mass gas flow rate from LPG container, the temperature and vapor pressure of LPG, and the remained LPG at containers to be exchange by using LPG property equations, mass balance equation, and heat balance equation. The simulation results were correlated well with experimental data. The overall heat transfer coefficient from air to LPG is approximately
and does not strongly affect on the evaporation capacity of LPG container. The mass gas flow rate from LPG container is constant when the vapor pressure of LPG is within pressure regulator's control range. While, out of range, it suddenly reduce to a evaporation rate which is balanced with heat transfer from air. The evaporation capacity of LPG container increased with surrounding temperature and the composition of propane, and decreased drastically with continuous gas consumption. The number of gas containers divided the number of houses using gas supply system was reduced by using automatic gas feeding device.
Development of Vibration Prediction Program of Gas Pipeline by Construction Vibration
Jeong S. Y. ; Hong S. K. ; Kim J. H. ; Koh J. P. ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 30~35
Presently, working gas pipelines are being subjected to the influence of construction vibration. Especially on subway and road construction, gas pipelines are being influenced to construction vibration caused by use of construction equipment, passage of a large-sized vehicle and blasting. Buried gas pipelines are subjected to the influence of vibration caused by blast in the vicinity of pipeline, exposed gas pipelines are subjected to the influence of vehicle vibration. Therefore, in the study, it is developed to vibration prediction program of gas pipeline by analyzing measured construction vibration. This program is able to predict vibration of gas pipeline according to field conditions by using the results of structural finite element analysis and empirical equation by reliability analysis. And, this program contains the database of construction vibration. Additionally, this program is able to compute estimated blast vibration equation using measured blast vibration data in the field and to form graph of allowable charging gunpowder per delayed-action with the change of blast velocity. Therefore, field workers are able to predict construction vibration around gas pipeline and estimate safety of gas pipeline.
Gas Explosion Hazard Analysis in Domestic
Jo Young-Do ; Kim Ji-Yun ; Kim Sang-sub ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 36~42
A leak of fuel gas in partially confined area creates a flammable atmosphere and give rise to an explosion, which is one of the most common accident in domestic. Observations from accident in domestic suggest that some explosions are caused by a quantify of fuel significantly less than lower explosion limit(LEL) amount required to fill the room, which is attributed to inhomogeneous mixing of leaked gas. The minimum amount of leaked gas for explosion is highly dependent on the mixing degree in the area. For lighter gas, such as methane, a high concentration tends to build up in the space from ceiling of room. But heavy gas, such as propane, a high concentration tends to build up in the space from bottom of room. This paper presents a method for analysing the explosion hazard in a room with very small amount of leaked gas. Based on explosion limit concentration, the gaussian distribution model is used to estimate the minimum amount of leak which yields a specified explosion pressure. The results demonstrate that catastrophic structural damage can be achieved with a volume of fuel gas which is less than 0.5 percent of the total enclosed volume in domestic. The method will help analyzing hazard to develop new safe device as well as investigating accident.
Establishment of natural gas high-pressure pipeline network model in Korea
Park Young ; Lee Young Chul ; Lee Jeong Hwan ; Cho Byoung Hak ; Lim Jong Suk ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 43~51
ln this study, a natural gas pipeline network model was established using STONER. First a map of natural gas pipeline network was drawn on STONER and then the length and diameter of the pipe were inputted. And as the specific gravity of gas flowing in the pipeline which is the value of natural gas was inputted. Finally in order to decide the pipeline variables and gas temperature, through the verification with observed real data, the possible error was minimized. For the verification, the pipeline variables and gas temperature were assumed and the pipeline network analysis was accomplished with real demand data. The square deviation of analysed pressure from observed pressure was calculated and the minimum case was selected for the optimum pipeline variables and gas temperature. Thus a proper natural gas pipeline network model for real network was established.
Program Development on the Thermofluidodynamic Analysis of LNG Storage Tanks
Kim Hoyeon ; Choi Sunghee ; Bak Young ; Lee Junghwan ; Yoon Ikkeun ; Kim Donghyuk ; Ha Jongmann ; Joo Sangwoo ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 52~61
Cryogenic LNG(Liquefied Natural Gas) which is stored in the cylindrical storage tanks of
has very complex flow phenomena and the changes of thermal properties with exterior conditions and operation modes. These complex thermofluid behaviors are affected by the storage, exterior conditions of LNG, design specifications and heat transfer characteristics of tanks. Also, those have influence on the stable storage and supply of LNG in the storage tanks. Thus this study peformed the analysis on the 2-D heat transfer of the tank with exterior conditions, on the Cool Down Process in order to cool down the LNG Storage Tank at the initial normal state, and on the Filling Process considered for incoming and rising of LNG. The analysis on the Mixing LNG Storage was studied too. At last, the visualized program on the complex thermofluidodynamic analysis was developed on the basis of the above analyses. The development of this program becomes to be used to the basic design of the commercial tanks as well as to assure technical skill of the analysis on the thermal stability of the stored LNG in the LNG Storage Tank.
Overpressure Prevention of Pipeline Attached to Outlet of LPG Vaporizer
Park Kyo-Shik ; Park Heui-Joon ; Kim Ji-Yoon ;
Journal of the Korean Institute of Gas, volume 5, issue 2, 2001, Pages 62~68
Overpressure in pipeline attached to outlet of LPG vaporizer has been studied to provide countermeasures to prevent it. The cause of liquefaction in pipeline was reviewed using vapor pressure curve with temperature, pressure, and composition to suggest method of controlling such parameters. Performance of vaporizer has been tested to detect defective design of float ball, and then improved scheme was suggested. Trouble of regulator attached to vaporizer was also studied to give countermeasures.