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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 2, Issue 4 - Dec 1998
Volume 2, Issue 3 - Sep 1998
Volume 2, Issue 2 - Jun 1998
Volume 2, Issue 1 - Mar 1998
Selecting the target year
Properties of Pressure-Sensitive Rubber Adhesive in a Heat Shrinkable Sheet for the Protection of Welded Part of Gas Pipe Line
Song Sung-Ku ; Hwang Kyu-Suk ; Kim Wonho ; Chung Kyung-Young ; Bae Jong-Woo ; Choi Heung-Hwan ; Lee Seong-Min ; Shin Sung-Sik ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 1~11
To increase peel strength, low temperature properties and flowability of pressure sensitive adhesives(PSA) used in a heat shrinkable sheet, these properties were evaluated by changing each components in type and content. In this study, Isobutylene-co-Isoprene Rubber (IIR) which has good wetherability was selected as a base polymer. Instead of rosin ester, petroleum resin was selected as a tackifier because of superior peel strength. By decreasing petroleum resin contents, flowability of PSA was decreased. High molecular weight of polybutene was better than low molecular weight for the peel strength of PSA. Large particle size of carbon black showed better properties than small one in peel strength and brittleness temperature. By adding calcium carbonate, the cost of compound was able to be reduced. But it must be used with carbon black.
A Modeling for Automated Fault Tree Synthesis of Chemical Processes
Lee Ho Kyun ; Hou Bo Kyeng ; Hwang Kyu Suk ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 12~17
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. For the synthesis of fault tree in chemical processes, this study represents the cause-effect relations between process variables by using the Signed Directed Graph(SDG), and has synthesized Fault Tree(FT) by searching the causes of fault events using the general operator and loop operators defined corresponding to path characteristics on the SDG.
A Comparative study on the pricing mechanism and social welfare in the Natural Gas Market
Namgoong Yoon ; Choi Kiryun ; Kim Boyung ; Lee Kiho ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 18~24
This paper attempts to improve domestic natural gas pricing system, thereby optimizing social welfare. This is done by deriving theoretical frameworks of natural gas pricing, which make use of both Ramsey component pricing rule and Efficient component pricing rule based on the theory of marginal cost. Allocative efficiency and social welfare between gas prices derived from the three pricing mechanism, present Cost-based pricing, Ramsey component pricing rule and Efficient component pricing rule, are analysed and compared in the case study. For the city gas, allocative efficiency of Cost-based pricing is higher than that of Ramsey component pricing rule and Efficient component pricing rule. In contrast, for the natural gas consumed for power generation, allocative efficiency of Cost-based pricing is lower than the other two pricing systems. It also turns out that social welfare is improved by the prices driven from Ramsey component pricing rule and Efficient component pricing rule rather than present Cost-based pricing.
Parametric Sensitivity Analysis and Damage Estimation for BLEVE and Fireball
Kim Hyung Seok ; Kim In Tae ; Song Kwang Ho ; Ko Jae Wook ; Kim In Won ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 25~36
Explosion and fires can occur in all segments of chemical and petroleum industries because of complexity of process, usage and storage of flammable and reactive chemicals, and operating conditions of high pressure and temperatures. Especially chemical plants have high possibility of the occurrence of BLEVE(Boiling Liquid Expanding Vapor Explosion)and Fireball. In this study, a computer program was developed for the effect assessment of BLEVE and Fireball. BLEVE was analysed by three explosion models of physical explosion model, isothermal expansion model and adiabatic expansion model and Fireball using solid model. The parametric sensitivity analysis has been done for the models of BLEVE and Fireball. The damage by BLEVE and Fireball of Benzene and Toluene and m-Xylene were estimated.
Behavior of Liquid Nitrogen in the Cryogenic Storage Tank
Park Byung Whee ; Lee Hyun Chul ; Park Doo Seon ; Son Moo Ryong ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 37~48
A cryogenic liquid stored in the closed cryogenic tank has been studied at various liquid levels. The change of pressure, temperature, and liquid-vapor ratio in the tank depended on the liquid levels. The various phenomena were shown at different liquid levels as follows: (1) liquid level was increased with condensation of vapor: (2) liquid was vaporized in spite of liquid level going up for a certain initial period and then condensation of vapor occurred at higher pressure; (3) liquid was vaporized without liquid level change; (4) liquid was vaporized with liquid level decreasing. If the tank is full with cryogenic liquid, it is extremely dangerous because of soaring the pressure. Therefore the tank must be filled with
liquid according to the safety rules. If the tank was filled with
ullage, the pressure increment as high as 80bar during first 5 days. With
liquid level, however, the pressure was increased as low as 1.5bar in the same period. No matter what the liquid level is, it is very dangerous if the tank is locked-up with filled cryogenic liquid for a long time.
Soft sensor design based on PLS with hybrid inner model
Hong Sun Ju ; Han Chong Hun ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 49~53
It takes quite a long time for an analyzer, such as gas chromatography, to measure a bulk property of a system, which prevents on-line measurements. Also, the cost of installation and maintenance is very high. Consequently, some other means is needed for on-line measurements of properties and the development of soft sensors based on process variables like temperature and pressure is of great interest. In the field of gas industry, the development of a soft sensor which makes indirect on-line measurements of gas compositions and flow rate, is in progress. In this paper, we proposed a hybrid inner model PLS which improved the prediction performance by taking into account the data structure, as an empirical modeling algorithm. When applied to a design of a soft sensor of a distillation tower, the hybrid inner model PLS showed better prediction performance than other methods.
Development of a Monitoring System for Batch Gas Manufacturing Processes
Lee Young-Hak ; Lee Don-Yong ; Han Chong-hun ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 54~59
As distributed control systems (DCS) and plant information systems (PIS) are introduced into gas industries, process monitoring systems based on process data have attracted significant interests. However, these technologies have not been fully due to strong nonlinearities of batch processes. The multiway principal component analysis, which has been recently developed, has solved these problems and has been widely used in the industries. However, the lack of statistical background of process operators has been one of major obstacles for maximum utilization of the technology This paper introduces a real time monitoring system for batch gas manufacturing processes that offers a variety of tools that operators can understand and use without serious difficulties. The proposed integrated system covers the whole spectrum of monitoring and diagnosis that include data collection, monitoring and diagnosis. The developed system has been verified to be very effective for monitoring and diagnosis using its application to the construction of monitoring system for a typical industrial batch reactor.
The study on the methane activation by a plasma
Cho Won Ihl ; Baek Young Soon ; Kim Byung Il ; Kim Young Chai ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 60~69
Methane, the major constituent of natural gas, had been converted to higher hydrocarbons by microwave and radio-frequency plasma in vacuum condition. Methane had been activated to plasma by suppling high energy then converted to ethane, ethylene, acetylene. The direct conversion process of methane had produced few by-products and demanded low-energy. The plasma sources were microwave and radio-frequency. Two types of reactor had been used to activate methane. One is common single tubular-type reactor and the other is series coil-type reactor which used for the first time in this study. To produce more C2 products, methane had been converted by a plasma and catalyst. The results of this study could be used to study mechanism of plasma reaction of methane, design the plant-scale reactor.
Qualitative Human Error Assessment for Gas Facilities
Yoon Ik-Keun ; Ha Jong-Mann ; Oh Shin-kyu ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 70~77
This study proposes a method to facilitate the identification of human error in calling out such qualitative risk assessment in Gas plants. The main idea of this method is based on the scheme of existing qualitative risk assesment technique. The guidewords and tabular worksheet are suggested to be compatible in human error analysis. By using this method developed, the maintenance procedure of Governor system in gas valve station was analyzed to discover the human error in maintenance tasks. As a consequence, certain human errors were identified and the suggested approches proved to be adequate technique for the human error analysis.
State-of-the-Art of the Ni-bearing Ferritic Steels for LNG Storage Facilities
Han Seung Zeon ; Kim Hyoung-Sik ; Hong Seong-Ho ; Kim Sung-Joon ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 78~87
The mechanical properties, heat treatment and the history for the development of Ni-bearing ferritic steels for the application at low temperatures are reviewed. Ni-bearing ferritic steels are classified into
Ni steel and
Ni steel., of which
Ni steels are most widely used for the large LNG storage tanks owing to their encellent fracture toughness up to
. The effect of retained austenite on the tensile properties and toughness was precisely discussed. As the size of LNG storage tank increases, thicker plates are needed. Thus, the recent efforts for the improvement of low temperature toughness and homogeneity are also introduced.
Development of Diagnosis System for LNG Pump
Hong S. H. ; Lee Y. W. ; Hwang W G. ; Ki Ch. D. ; Kim Y. B. ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 88~95
Vibration analysis of rotating machinery can give an indication of possible faults thus allowing maintenance before further damage occurs. Current predictive maintenance system installed in Pyung-tak has the ability to diagnose the mechanical problems within the LNG Pump when the vibration exceeds preset overall alarm levels. In this study, LNG pump auto-diagnosis system based upon Windows NT and DSP Board is developed. This system analysis velocity signal acquired from dual accelerometer input monitor system to diagnose pump condition. Many plots which display machine condition are shown and features of vibration are stored in every time. If the fault is found, the system diagnoses automatically using expert system and trend monitoring. Operator checks pump condition intuitively using personal computer monitor.
A Study on Developing a Safety Management Evaluation Program
Kim Yun-Hwa ; Lim Dong-Yun ; In Cha-Soon ; Ko Jae-Wook ; Lim Dong-Ho ; Choi Soo Hyoung ;
Journal of the Korean Institute of Gas, volume 2, issue 3, 1998, Pages 96~100
Chemical plants with high-technological equipments and complex processes are continually increasing potential hazards that may result in huge industrial accidents. If an incident breaks out, it will have a hazardous effect on in-plant workers, neighboring inhabitants or the surrounding environment. Therefore, it is necessary to develop a safety management system that can pre-evaluate the safety and reduce the risk of a chemical plants. The safety management evaluation program developed in this study can implement an effective loss control management in chemical plants. It integrates important lists in safety management lists and legal measures to analyze elements systematically. It also includes incident case analysis and the required components in domestic laws.