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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
Editor in Chief :
Volume & Issues
Volume 4, Issue 4 - Dec 2000
Volume 4, Issue 3 - Sep 2000
Volume 4, Issue 2 - Jun 2000
Volume 4, Issue 1 - Mar 2000
Selecting the target year
A comparison of predicted VLE of LNG mixtures containing
by use of Cubic and Noncubic EOS
Choi Eunjoo ; Lee Taejong ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 1~5
Cubic and non-cubic equations of state are used to calculate the vapor-liquid equilibrium(VLE) compositions for liquified natural gas(LNG) containing hydrogen sulfide. Modified Benedict-Web-Robin EOS is chosen as a non-cubic equation of state while Peng-Robinson, Soave-Redlich-Kwong EOS are used for a cubic EOS. Modified Benedict-Web-Robin EOS. showed better predictability than the cubic EOS used for the systems
. specially for liquid composition.
Development of Split Tees for Gas Steel Pipelines
Kim Young Gyu ; Noh Ou Sun ; Kim Ji Yoon ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 6~12
We have developed a new split tee which can be used to effectively branch into a main gas steel pipelines without losing any gas pressure or having to shut down a line. The split tee has been designed considering the locations of branch connection to the pipelines. Therefore, we could keep the depth of buried pipelines which used to be the problem of the conventional split tees. Test results of the developed split tee showed that the performance of the tightness, hydraulic strength, sealing, welding, bending, and compatibility were excellent. The application of the split tee can provide the advantage of eliminating cost and time, and easy field pipeline coatings.
A study on the utilization of exhausted heat from subway for energy source of heat pump
Kim J.R. ; Jeong K.C. ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 13~19
Researches on unused energy are being continued because of the limited fossil fuel and the destruction of environment. Therefore this study was performed as follows The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipments was compared with one by unused heat source equipments when the exhausted heat was used by heat pump in heating and hot water supplying.
A Study on Hazards Assessment of Electrostatic Firing Explosion of Working Wears at LPG Stations in Korea
Cho young doo ; Koo Ja Hyeuk ; Choi Kwang Seo ; Seo Dae Won ; Joung Jae Hee ; Takeuchi Manabu ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 20~24
The electrostatic safety consciousness of safety manager were investigated through questionnaires sent to liquid petroleum gas stations in Korea. In addition, hazards of fire and explosion due to electrostatic on synthetic-polymer-wears and cotton-wears were estimated experimentally. The results of questionnaires indicate most workers wear their working clothes indiscreetly owing to lack of knowledge of preventing electrostatic hazards. The amounts of electrostatic charge generated in synthetic-polymer-wears were 1.79, 1.44 and 1.02
C in winter, spring and autumn and summer, respectively. All these values exceed the limit of working wears of 0.60
C requested by Korea Standard(KS K-7807) for preventing electrostatic hazards, which means hazards may occur. While, the charge in cotton-wears were in the range of 0.42 to 0.52
C, which suggests that the cotton-wears investigated in this study have no problem of hazards. Therefore workers, visual and experiential education are necessary for elevating the standard of on electrostatics. It is also necessary to establish standards of wearing for preventing electrostatic hazards.
]-integral Based Life Assessment of High Temperature Pipes
Lee Hyungyil ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 25~33
In recent years, the subject of remaining life assessment has drawn considerable attention in power plants, where various structural components typically operate at high temperature and pressure. Thus a life prediction methodology accounting for high temperature creep fracture is increasingly needed for the components. Critical defects in such structures are generally found in the form of semi-elliptical surface crack, and the analysis of which is consequently an important problem in engineering fracture mechanics. On this background, we first develop an auto mesh generation program for detailed 3-D finite element analyses of axial and circumferential semi-elliptical surface cracks in a piping system. A high temperature creep fracture parameter
-integral is obtained from the finite element analyses of generated 3-D models. Post crack growth module is further appended here to calculate the amount of crack growth. Finally the remaining lives of surface cracked pipes for various analytical parameters are assessed using the developed life assessment program.
An Empirical Study of Ramp;D Investment Assessment in Natural Gas Industry
Park Seung-Min ; Oh Kyung Joon ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 34~41
The purpose of this paper is to assess the R&D investment of Korea Gas Corporation (Kogas) by combining several measures including R&D needs, technology spillover effects, and technology stock at the corporate level. This study has revealed that Kogas has concentrated its R&D resources on the operation and maintenance of gas supply facilities, and technology groups, which have higher fulfillment of R&D needs and technology spillover effects, have been on the relatively greater level of technology stocks.
A Process Decomposition Strategy for Qualitative Fault Diagnosis of Large-scale Processes
Lee Gibaek ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 42~49
Due to their size and complexity, it is very difficult to make diagnostic system for the whole chemical processes. Therefore, a systematic approach is required to decompose larpge-scale process into sub-processes and then diagnose them. This paper suggests a method for the minimization of knowledge base and flexible diagnosis to be used in qualitative fault diagnosis based on Fault-Effect Tree model. The system can be decomposed for flexible diagnosis, size reduction of knowledge base, and consistent construction of complex knowledge base. The new node, gate-variable, is introduced to connect the cause-effect relationships of each sub-process. For on-line diagnosis, off-line analysis is performed to construct Fault-Effect Trees of gate-variables as well as activation conditions of gate-variables. On-line diagnosis strategy is modified to get the same diagnosis result without system decomposition. The proposed method is illustrated with a fault diagnosis system for a large-scale boiler plant.
A Review of the Different Models for Predicting Blast Overpressures Caused by Vapor Cloud Explosions
Park Dal Jae ; Lee Young Soon ; Lim Young Hoon ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 50~57
Past accidents have shown that vapor cloud explosions are the predominant cause of the largest losses in the chemical and petrochemical industries due to the generation of significant overpressures. Prediction of such overpressure is of great concern and a knowledge of the likely overpressure is needed for the design of equipment, safety cases and emergency planning. For these reasons, risk assessment for vapor cloud explosion is crucial and this assessment can be carried out using the different models including TNT-Equivalency, TNO Hemispherical, TNO Multi-Energy and CFD models. Accordingly, in this paper, the published VCE prediction models are reviewed to provide a critical comparison of the different models used for the quantification of explosion hazards, in terms of the fundamental assumptions employed, and their predictive accuracy
A Study on Process Data Compression Method by Clustering Method
Kim Yoonsik ; Mo Kyung Joo ; Yoon En Sup ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 58~64
Data compression and retrieval method are investigated for the effective utilization of measured process data. In this paper, a new data compression method, Clustering Compression(CC), which is based on the k-means clustering algorithm and piecewise linear approximation method is suggested. Case studies on industrial data set showed the superior performance of clustering based techniques compared to other conventional methods and showed that CC could handle the compression of multi-dimensional data.
A Study on Developing a Knowledge-based Database Program for Gas Facility Accident Analysis
Kim Min Seop ; Im Cha Soon ; Lee Jin Han ; Park Kyo Shik ; Ko Jae Wook ;
Journal of the Korean Institute of Gas, volume 4, issue 4, 2000, Pages 65~70
We develop the database program for accident cause analysis which can help to increase domestic safety custom and prevent recurrence of gas accident and analyze accidents easily The program developed in this study consists of two parts. one part uses accident case database applied if than rule, so it finds root causes by inference of some input values. The other uses Root Cause Analysis Map which divided human errors and equipment difficulties and so we get general root cause by reply some proper questions.