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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
Journal Basic Information
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
Selecting the target year
The 'Consequence Analysis' of Variables Affecting the Extent of Damage Caused by Butane Vapor Cloud Explosions
Char Soon-Chul ; Choo Kwang-Ho ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 1~7
This paper presents a 'consequence analysis' for vapor cloud explosions caused by heavy gas leakages from commercially used storage tanks at petrochemical plants. Particularly, this paper emphasizes on evaluating the results of various vapor cloud explosion accidents from Butane storage tanks. Also this paper analyses the impact of variables on the accidents in order to acquire the optimum conditions for variables.
Professional Edition was applied to analyse the impact (If atmospheric and other variables in the situation where vapor cloud continuously disperses from the ground level. Under the assumption that practical operating conditions are selected as a standard condition, and Butane leaks from the storage tank for 15 minutes, the results show that the maximum distance of LFL (Lower Flammable Limit) was 52 meters and overpressure by the vapor cloud explosion was 1 psi at 128.2 meters. It is observed that the impact of the variables on accidental Butane storage tank leakage mainly varied upon atmospheric stability, wind velocity, pipe line size, visible length, etc., and changes in the simulation result occurred as the variables varied. The maximum distance of the LFL (Lower Flammable Limit) increased as the visible length became shorter, the size of the leak became larger, the wind velocity was decreased, and the climatic conditions became more stable. Thus, by analysing the variables that influence the simulation results of explosions of Butane storage tanks containing heavy gases, I am presenting the most appropriate method for 'consequence analysis' and the selection of standards for suitable values of variables, to obtain the most optimal conditions for the best results.
Political Economy of Privatization of Public Utilities
Lee Heng ; Chae Doo-Byoung ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 8~20
Neoliberalism became a catch word of a post-cold war era. It began to develop in the middle of welfare state crisis in developed countries. It promoted both a unified world market through mutual penetration of national boundaries in International scene and maximization of efficiency through market competition in domestic scene. Privatization of public corporations is a major policy to pursue market efficiency through deregulation. Two reasons are often adduced to support the cause The socio-economic changes diminished the necessity to establish public corporation on the one hand. On the other hand gross inefficiency has been observed in the management of public corporation. 'Government failure' is an apt expression of the inefficiency. In analysing the experiences of privatization of utility industries of some other countries we found a couple of lessons for a Korean case. First, it is doubtful if privatization, that is a change in the form of ownership, is a necessary condition for achieving market efficiency. Because it is possible to operate a mechanism of market competition while maintaining competition among public corporations and with private actors. Second, the patron-agent dilemma is often cited as a major culprit of an inefficient management of public corporations. But it is without saying that the dilemma is also found in the management of private firms. So, the issue is not the privatization per se but to realize responsible management through discipline and incentives.
A Study on the System Integrity of Gas Pipeline by High Voltage Power Line in Submarine Tunnel
Bae Jeong-Hyo, ; Ha Tae-Hyun, ; Lee Hyun-Goo, ; Kim Dae-Kyeong, ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 21~26
Because of the continuous growth of energy consumption, and also tile tendency to site power lines and pipelines along the same routes, the close proximity of high voltage structures and metallic pipelines has become more and more frequent. Recently, the results of assessment about a system integrity are needed in korea also when a gas pipeline is running parallel with high voltage power line in same submarine tunnel, Therefore, we analyze the system integrity(AC corrosion of pipe, melting of pipeline coating, safety of insulation flange, especially cathodic protection system which are rectifier and CI(cathodic Isolator)) resulting from the influence of high voltage power system.
CaO Manufacture for
Adsorption at a High Temperature
Lee Tae-Jong ; Kim Gil-Soo ; Baek Il-Hyun ; Kim Bu-Ung ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 27~32
It is desired that carbon dioxide causing a greenhouse effect be removed at a high temperature and high pressure in a steam reforming reaction. In this research, a pellet form of adsorbent CaO is employed to capture
. The adsorbent was manufactured using a high pressure molding on powdered
followed by calcination. Then its properties were analyzed and the adsorption experiments were carried out in a batch adsorption chamber. The pore area was found to be dependent on a molding pressure and the pore distribution showed two peaks. It is examined that
binds to CaO by means of chemisorption and its maximum conversion is nearly
The Effect of LiBr Concentration on Corrosion of Absorption Refrigeration Systems Using
Lim Uh Joh ; Jeong Ki Cheol ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 33~39
This paper was studied on corrosion behavior of absorption refrigeration systems using
working fluids. In the various concentration of lithium bromide solution, polarization test of SS 400, Cu(C1220T-OL) and Al-Ni bronze is carried out. And the corrosion behavior of materials forming absorption refrigeration systems is investigated. The main results are as following: 1) As concentration of lithium bromide solution increases, polarization resistance of materials of each kinds is low. And open circuit potential becomes less noble, the corrosion current density is high drained 2) Open circuit potential of SS 400 is less noble than that of Cu and Al-Ni bronze, corrosion current density of SS5 400 is high drained than that of Cu and Al-Ni bronze. 3) Anodic polarization of Cu and Al-Ni bronze in
LiBr solution continues the active state. that of Cu and Al-Ni bronze in the natural sea water maintains the active state and the critical current for passivation appears.
A Study on Reliability Analysis and Quantitative Risk Analysis for Liquefied Petroleum Gas Station
Kim In-Won ; Jin Sang-Hwa ; Kim Tea-Woo ; Kim In-Tae ; Yeo Yeong-Koo ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 40~48
For a Liquified Petroleum Gas(LPG) station, the reliability analysis, such as Fussell-Vesely importance, risk decrease factor and risk increase factor, was carried out and the risk ranks of events were determined. In order to confirm the degree of the risks identified in the reliability analysis, the quantitative risk analysis was done for the equipments which had the large values of risk ranks. As a result of the importance analysis for the LPG station, the external event was identified as the most riskful event. The defect of construction structure and the pipe corrosion were riskful as well. The result of quantitative risk analysis showed that the length of 46.3 meters were estimated to damage the process equipments by the thermal flux from the catastrophic rupture of storage tank in Boiling Liquid Expanding Vapor Explosion.
Design Safety Analysis of
Nickel Steel Structure in Inner Tank Storage System
Kim Chung Kyun ; Choi Dong Yul ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 49~55
This paper presents the design safety analysis of the inner tank structure, which is manufactured by 9 percent nickel steel sheets in the full containment type LNG storage tank. The FEM computed results indicate that top girder and several stiffener rings of the inner tank play an important role for controlling the deformation and stress intensity of the inner tank structure. The hydrostatic pressure due to cryogenic fluids gave more influential to the deformation of the inner tank wall compared with that of a cryogenic temperature of
. But, the deformation and stress of the inner tank. which is produced by the buckling loads, are very small because the external load is not applied to the top of the inner tank. This indicates the role of top girder and stiffener rings of the inner tank model is not important in full containment LNG storage tank.
A Study on Surveying Functions of RBI Software
Song J S ; Shim S H ; No W H ; Park J H ; Choi S C ; Kwon J R ; Kim J Y ; Yoon K B ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 56~61
Recently RBI softwares have received widespread interests from various industries. The available RBI softwares have variety of levels of analysis, fields of applications and damage mechanisms considered, which depend on the software developing institutes. In this paper results of a GSP(Group Sponsored Project) entitled 'Study on Surveying Functions of Foreign RBI Softwares' are summarized. A part of the study is explained in detail as a sample case for showing the contents of the project. Based on the demo softwares as well as the open documents and contents obtained in the web pages of the developer critical comparisons of the well-known RBI softwares were made. The required functions of the optimal RBI software is also discussed from the review results of this study.
A Study on the Effectiveness of Gas Safety Devices for Domestic
Jo Young-Do ; Lee Kyung-Sik ; Jang Sung-Dong ; Kim Ji-Yun ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 62~69
Gas safety devices are very effective to prevent catastrophic gas accident in domestic. The safety devices are included in domestic gas equipment such as extinguishing safety device and adapted at pipeline such as fuse cock, shut off device with gas alarm and so forth. In spite of using those safety devices, a few hundreds of gas accident was happened annually in residential house. In this study, we analysed systematically the domestic accidents which was happened in five years using fault tree analysis(FTA) method and analysed the effectiveness of individual safety device. And also, it was suggested that the rate of accident was decreased quantitatively by increasing safety device which is adapted in domestic. By analysis of 769 gas accidents in domestic, the order of effectiveness of safety device to prevent domestic gas accident was the multi-functional gas-safe-meter(micom-meter), fuse cock, gas leak alarm and CO alarm. If the above four kind of safety device are adapted to every house, about
of accident will be reduced and the most of catastrophic gas accident will be Prevented in domestic.
A Study on Sensitivity Analysis and Uncertainty Analysis for Continuous Stirred Tank Reactors
Kim In-Won ; Jin Sang-Hwa ; Kim In-Tea ; Song Hee-Oeul ; Yeo Yeong-Koo ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 70~78
In order to find out which equipment failures were mostly contributed to the rupture of a continuous stirred tank reactor, the sensitivity analysis was carried out. The uncertainty of likelihood of the rupture of reactor was studied by the uncertainty analysis. And the cost effectiveness analysis resulted in the recommendation of the exchange with a better reliable unit if you want to maintain the process efficiently from the view point of cost. The uncertainty analysis showed that the likelihood of catastrophic rupture of the reactor was distributed from
. As a result of cost-effectiveness analysis, it was proposed to exchange the voting logic unit for a better safer system.
Effect of the polyols and blowing agents on properties of rigid polyurethane foam
Kim S. B. ; Son Y. J. ; Kim Y H. ; Lee Y B. ; Choi S. H. ; Choe K. H. ; Kim W. N. ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 79~84
In this study, the effect of polyol structure(OH-value, functionality) on the reactivity, mechanical property and cell morphology of polyurethane foam and the possibility of replacing HFC-36smfc was examined by evaluating how each blowing agent(CFC-11, HCFC-l4lb, HFC-36smfc) affects the reactivity, mechanical property and cell morphology. Results of the experiment showed that as the functionality and OH-value of polyol increased, there was an increase in the temperature profile, reaction rate, density and compressive strength. However. as the functionality and OH-value increased. the ceil size became smaller The use of different kinds of blowing agents did not appear to have and significant influence on the temperature profile, reaction rate, density and compressive strength. The foam using HFC-365mfc produced more uniform cells compared to the foam using HCFC-l4lb.
A Study on the Leak-Proof of Full Containment Type Prestressed Concrete Structure
Kim Chung Kyun ; Cho Seung Hyun ;
Journal of the Korean Institute of Gas, volume 5, issue 4, 2001, Pages 85~91
This paper presents safety analysis of LNG leakage in a prestressed concrete outer tank, which is strongly related on the leak checking effects of the PC structure with and without a residual compression zone based on the BS 7777 codes. The full containment type outer tank which is constructed by a prestressed concrete may be destroyed by leaked cryogenic fluids. The FE calculated results show that the total leak checking time of the PC structure with
residual compression zone is about 9 days for
liquids. But, three primary pumps in an inner tank may operate to send cryogenic fluids for 6 days, which are stored in an inner tank of
capacity This means that the prestressed concrete outer tank may be safe for
cryogenic fluids leaked from the demolished inner tank.