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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
Editor in Chief :
Volume & Issues
Volume 3, Issue 3 - Dec 1999
Volume 3, Issue 2 - Jun 1999
Volume 3, Issue 1 - Mar 1999
Selecting the target year
Review on the Effects of Material Heterogeneity on Fracture Toughness in Steel Weldment
Jang J.-i. ; Yang Y.-c. ; Kim W.-s. ; Lee B.-W. ; Kwon D. ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 1~10
The evaluation of fracture toughness in weldment is necessary for the safety performance of industrial structures with large scale such as various power plants, LNG (liquefied natural gas) storage tanks, etc. It is generally known that weldments have material heterogeneity, which results in the serious changes in fracture characteristics of HAZ (heat-affected zone). Nevertheless, the systematic study on material heterogeneity of weldment has not been performed yet in Korea. Therefore in this paper, the effects of material heterogeneity on the fracture toughness of structural steel HAZ were introduced and reviewed.
An Analysis of Effects of Changes in Foreign Exchange Rates on the Domestic Energy Prices : Diesel, Heavy Oil, and LNG
Jung Gi Chul ; Choi Jea Seoung ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 11~16
Oil and LNG products are characterized by the facts that the raw materials are all imported and financing is dependent heavily upon foreign countries. This makes the oil and LNG products sensitive to changes in foreign exchange rates. However, the extent to which they respond to changes in foreign exchange rates, particularly the extent of price changes, vary considerably, due to the differences in the structures of price determination. The purposes of this paper are twofolds. The first one is to analyze the structures of price determination of diesel, heavy oil, and LNG. The second one is to analyze the effects of changes in foreign exchange rates on the prices of and price competitiveness of the fuels in question through the sensitivity analysis. The results of the sensitivity analysis indicate that diesel price is most sensitive and heavy oil price is least sensitive to changes in foreign exchange rates.
Development of Anti-disaster System for Natural Gas Governor Station Using Wire and/or Wireless Communication
Yoo Hui Ryong ; Park Dae Jin ; Koo Sung Ja ; Park Seoung Soo ; Rho Yong Woo ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 17~23
The wire and/or wireless data communication system for anti-disaster system of natural gas governor station was developed. In oder to prevent accidents of governor station, the operator was replaced by RTU(Remote Terminal Unit) which gather and transmit safety situation of governor station. The database and MMI(Man Machine Interface) were also developed to analyze the situation of governor station. The data communication between server and RTU was designed to switch automatically from wire to wireless communication and vice versa when one of them failed communication. We also have developed the patrol car management system which was applied GPS(Global Position System)/GIS(Geometric Information System), and the earthquake detection/transmission system which was adopted three dimension acceleration sensor. When a earthquake may occur, the earthquake detection/transmission system monitors data such as PGA(Peak Ground Acceleration), Sl(Spectrum Intensity) and orders the emergency shutoff valve close immediately.
A Study on the Minimum Safe Separation Distance from LPG Filling Station
Jo Young-Do ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 24~33
The minimum safe separation distances from LPG filling station was discussed in this work based on the accident data from 1987 to 1998 in south korea, the initial damage of accident, and standards of countries. The safety distances are adequate to reduce ignition probability by released gas and provide space for implementation of emergency response after ignition. Therefore, the distances are related to the distance to LFL(Lower Flammable Limit) and the length of jet fire to prevent accident escalation. The range of the distance was suggested in this work to make standard with considering economic, culture, and safe guards.
Deviation - Propagation Models for Automating HAZOP Analysis of Batch Processes
Ok You-Young ; Hou Bo-Kyeng ; Hwang Kyu-Suk ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 34~42
The discrete variables such as time and sequence must be considered for automating HAZOP analysis of batch processes in contrast with continuous processes. Because these variables can not be explained by the method used in the HAZOP analysis of continuous processes, we have developed the methodology for HAZOP analysis of batch processes on the basis of the relation between discrete variables and continuous ones. In this study, we have discussed the performance of the methodology on a Latex batch process to evaluate its effectiveness.
A Study on the Diffusion Behavior of Leak Gas from Underground Gas Pipeline
Choi S.C. ; Jo Y.D. ; Kim K.S. ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 43~52
An experimental chamber was fabricated to observe the gas diffusion behavior of leak gas from underground city-gas pipeline. It was made of acryl so that feeding of gas and the measuring points of the gas could be varied in each experiment. The MOS sensors were used to measure the concentrations of leak gas. The soil media such as the Jumunjin standard sand and the granite weathered soil were used to measure the gas diffusion and the change of leak gas concentrations was measured with time for various gas flow rate. As the distance between the leak point of gas and the measuring point of MOS sensor decreases, or the leak rate increases, the detection time of gas at a measuring points decreases and the gas concentration increases quickly and the concentration of the gas at steady state also increases. As the density of granite weathered soil is higher than that of Jumunjin standard sand for compaction, the detection time of leak gas in the granite weathered soil was longer than that in the Jumunjin standard soil. The leak gas concentrations in the granite weathered soil were lower than those in the Jumunjin standard sand at the beginning of gas leaking from a pipe, but inverse phenomenon was occured at steady state.
A study on monitoring the subsidence of the gas utilities using GPS techniques
Cho S.H. ; Jeon K.S. ; Park P.H. ; Park J.U. ; Joh J.H. ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 53~61
The safety of gas utilities is intimidated by many causes. Among them, subsidence is a dominant cause to decrease the safety of gas utilities. So it is very important to monitor the displacement of subsidence. The purpose of this study is to on-line monitor the subsidence of gas utilities using Static GPS(Global Positioning System)technique. Static GPS technique, which is one of various GPS techniques and originally applied to monitor the crustal activity, was applied for two gas station in Korea Gas Corporation. Prior to applying this technique to the field, i.e, gas station, a preliminary test was peformed to confirm the accuracy of this technique. As a result, it was proved that this technique can measure the displacement of gas utilities three dimensionally by sub-millimeter. After getting confirmation of GPS technique, we applied this technique for two gas stations and monitored the amount of subsidence during 5 months. As a result of field test, we can conclude that the gas stations was subsiding several millimeters in a year.
Dynamic Positioning Control System for Gas & Oil Exploration Platforms Using H
Yoo Hui Ryong ; Rho Yong Woo ; Park Dae Jin ; Koo Sung Ja ; Park Seoung Soo ; Kim Sang Bong ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 62~69
This paper presents a design method of dynamic positioning control system(DPS) for floating Platform with rotatable and retractable thrusters using H
servo control design method. The norm band of uncertainty is captured by multiplicative perturbation between nominal model and reduced order model. A controller robust to the uncertainty is designed applying H
synthesis. The control law satisfying robust stability and nominal performance condition is determined through the mixed sensitivity approach. The control algorithm was evaluated on the basis of computer simulation for a proposed DPS design method and experiments was carried out with an image processing method for measurement of DPS position in a water tank The results of overall experiments show that proposed control method will be good to keep at a specified position. And they are compared with the experimental results by LQG synthesis and H
optimal control design method.
Minimization of Sulfur Dioxide Gas Emission by Process Optimization of Sulfuric Acid Plants
Cho Byoung-Hak ; Song Kwang Ho ; Kim In-Won ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 70~76
Because of the tight pollution control of
emission, sulfuric acid manufacturers have been interested in the operation with the highest possible conversion efficiency. In this work, the design criteria and operating conditions of the catalytic converter were investigated for maximum conversion efficiency and minimum
emission by parametric analysis and process optimization for the existing acid plants. The Double Converter/Double Absorber(DC/DA) process was investigated by varying
compositions of feed gas, pressures and temperatures of layers of the converter and the depth of the catalyst beds. In order to evaluate the process, a computer simulator for sulfuric acid plants has been developed. The results by process optimization could be used for the converter design and operating conditions with highest conversion efficiency.
Consequence Analysis of the Fire & Explosion on the Flammable Liquid Handling Facility and LPG Station
Lee Su-Kyung ; Lee Chang-Wook ;
Journal of the Korean Institute of Gas, volume 3, issue 2, 1999, Pages 77~84
The XX company that is handling the class IV hazardous materials, located in Bu-Chon City and the LPG station in front of the XX company which is about 20 meters apart, was chosen as the standard model for this study In carrying out the consequence analysis, PHAST and Super-Chems were used for the study and utilizing the output of the simulation, we have evaluated the consequences throughout the probit analysis and explosion overpressure analysis. In case of Acetone, the effect distance of the damage on facilities-that is the result of radiation heat flux of
by TNO model-is 68.51m by PHAST model and 40.93m by Super-Chem model. The risk assessment of the LPG station which is based on the explosion resulted as the analysis of the fire ball showed the diameter 125.2m, the height 206.2m and the duration 11.28sec and the effect distance for the radiant heat flux