Go to the main menu
Skip to content
Go to bottom
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
Fatigue Behavior of Before-and-After Penetration of Aluminium Plate with Long Surface Crack
Nam Ki-Woo ; Lee Jong-Rark ; Ahn Seok-Hwan ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 1~7
Fatigue behavior of before-and-after penetration was examined experimentally using surface pre-cracked specimens of aluminium alloy 5083-0. The fatigue crack shape before penetration is almost semicircular, and the measured aspect ratio is larger than the value obtained by calculation using K values proposed by Newman-Raju. It is found that the crack growth behavior on the back side after penetration is unique and can be divided into three stages. By using a crack propagation rule in case of long surface crack, the change in crack shape after penetration can be evaluated quantitatively.
A Study on the Establishment of Process Safety Management (PSM) System for Small and Medium Size Chemical Plants
Baek Jong-Bae ; Ko Jae-Wook ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 8~13
The article 49-2 of Industrial Safety Law requires that all the owners of industrial plants which contains dangerous facilities perform the process safety management. That is, this law requires the owners of industrial plants to take necessary measures to prevent fire, harmful gas leaking, explosion, and other serious accidents that could cause demage and injuries to the employees. So far, domestic chemical plants have tried to invest money and time in safety management. But, such efforts have been made only in chemical plants that were subsidiaries of large business groups. Moreover, since the economic crisis of Korea which is symbolized by the IMF bailout, small and medium size companies could not afford to invest in safety management. Their major concern is to increase productivity and thereby, survive in this crisis. The goal of this research is to develop the process safety management system that can help small and medium size companies to positively secure the process safety management. So, in developing the process safety management system, the financial and practical difficulties of such companies are fully taken into consideration.
Performance Characteristic of the Compression-Absorption Hybrid Heat Pump Cycles
Yoon J. I. ; Kwon O. K. ; Yang Y. M. ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 14~20
This study describes the results of Coefficient of Performance(COP) analysis by cycle simulation for two types of absorption-compression hybrid cycle using the Water/Lithium Bromide solution pair. These types are basic hybrid systems introducing a mechanical compression process into the refrigerant vapor phase of the single effect absorption cycle. In absorption-compression hybrid cycles, coefficient of performance is improved compared with absorption cycle. Hybrid cycle Type 2 is considered as a key technology to support energy utilization system, given its capability of utilizing waste heat to drive system with a high level of efficiency.
The Study on the Quantitative Analysis in LPG Tank's Fire and Explosion
Bae Sung-Jin ; Kim Byung-Jick ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 21~26
Chemical plant's fire and explosion does not only damage to the chemical plants themselves but also damage to people in or near of the accident spot and the neighborhood of chemical plant. For that reason, Chemical process safety management has become important. One of safety management methods is called 'the quantitative analysis', which is used to reduce and prevent the accident. The results of the quantitative analysis could be used to arrange the equipments, evaluate the minimum safety distance, prepare the safety equipments. In this study we make the computer program to make easy to do Quantitative analysis of the accident. The output of the computer program is the magnitude of fire(pool fire and fireball) and explosion(UVCE and BLEVE) effects. We used the thermal radiation as a measure of fire magnitude and used the overpressure as a measure of explosion magnitude. In case of BLEVE, the fly distance of fragment can be evaluated. Also probit analysis was done in every case. As the case study, Buchun LPG explosion accident in Korea was analysed by the program developed. The simulation results showed that the permissible distance was 800m and probit analysis showed that 1st degree bum, 2nd degree burn, and death distances are 450, 280, 260m, respectively the simulation results showed the good agreement with the results from SAFER PROGRAM made by Dupont.
A Study on the Structural Analysis of Controllability in Chemical Processes
Lee Byung Woo ; Kim Yoon Sik ; Yoon En Sup ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 27~32
Chemical processes are highly nonlinear, multivariable systems and have complex structures. However, the controllability evaluation procedures are complicated, and the required information is very often unknown at the early design stage. Therefore, it is necessary to develop a procedure to evaluate and enhance controllability while designing processes and plants. To evaluate controllability in the design stage, it is most efficient to analyze process structure. Relative order can be used as a measure of 'physical closeness' between input and output variable. Structural controllability analysis using relative order is shown to be effective in a case study of heat exchanger network synthesis.
Effective Extraction of Sea Mustard with Supercritical Carbon Dioxide
Lee Seok-Hee ; Cheon Jae-Kee ; Ju Chang-Sik ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 33~40
The extraction characteristics of lipids from powdered sea mustard have been investigated by the use of supercritical carbon dioxide(
) and cosolvents. The extraction rate was increased as the particle size of the sea mustard is smaller, the pressure is higher, the temperature is lower, and the quantities of the fluid is more. However, the extraction yield of lipids from sea mustard was almost constant at a given condition. The optimum extraction condition was determined with the extraction yield of
at 300um of particle size, 313K of
temperature, 13.8MPa of pressure, and 30L/min of flow rate. Ethanol was the most efficient cosolvent among ethanol, methanol, and hexane. The extraction yield was increased at about 2.21times by the addition of ethanol as a cosolvent to
. As the residence time and the average concentration of lipids were decreased, the mass transfer parameter(
) was increased. But the opposite result was obtained when the ethanol was used as cosolvent.
Development of Worksheet Program for HAZOP
Yoon I. K. ; Ha J. M. ; Han J. M. ; Lee J. H. ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 41~47
Recently, HAZOP has been used as one of the most effective way of qualitative risk assessment for plant industries. However, this technique requires much man labor to be successfully performed. This fact enables the adequate HAZOP worksheet program to help speeding up the procedure and managing the data of analysis. Based on the experience of HAZOP carrying out, the authors focused the purpose of this study on developing a useful and comfortable HAZOP worksheet program. The unique characteristics of developed program are the menu window expressed in common steps of HAZOP, versatile edit functions, and search menu for investigating the scenario data. The tendency analysis for existing HAZOP results was performed to validate the usefulness of the developed program.
Development of the Expert System for Hazard and Operability Analysis in Chemical Processes
Kim Ku Hwoi ; Kang In Koo ; Lee Byung Woo ; Lee Jong Min ; Yoon En Sup ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 48~57
Safe plants are maintained by the systematic identification of potential hazards. Various hazard evaluation methods have been developed in pursuit of safe plants. Recently, much efforts has been made for the automation of hazard evaluation system by introducing expert system to get rid of weak points of the conventional hazard evaluation methods. HAZOP study is recognized as one of the most systematic and logical hazard evaluation methods. However, it has several disadvantages; experts should participate simultaneously, the detailed study is time-consuming, and the quality of the results largely depends on the quality of the experts. Therefore, the automation of HAZOP Study is highly beneficial for reducing the required time and obtaining the consistent evaluation results. In this study, a framework for the automation of HAZOP study is suggested. Based on the suggested framework, HAxSYM, an expert system to automate HAZOP study, has been developed. The case study validates the performance of the developed system, and the results are compared with the results from the conventional HAZOP study.
Aging Characteristics of Low Pressure LPG Regulators for Domestic Use
Kim Young-Gyu ; Kwon Jeong-Rock ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 58~63
Experimental works were carried out to evaluate how the lapse of time affects the performance characteristics and the service life of low pressure LPG regulators for domestic use. Experimental results showed that the operating pressure of safety devices deviated from the opening pressure value and the closing pressure value from just 1 year after service, and the operating pressure of regulators used for 7
8 years notably deviated from the reference value of the adjusting pressure and the closing pressure. And the material properties of springs and diaphragms deteriorated after 5
6 years of service. Thus, it is estimated that low pressure LPG regulators have approximately 6 years of service life. However, it is highly recommended that regulators exceeding 5 years of service should be replaced for the safety of consumer and accident prevention even if they are operating normally.
A Criterion for Interaction Analysis and Loop Pairing Among Control System Variables
Ko Jae Wook ; Yoon En Sup ; Evans L. B. ;
Journal of the Korean Institute of Gas, volume 3, issue 1, 1999, Pages 64~74
Using the steady state gains, an appropriate criterion used for the interaction analysis among variables and the loop pairing is suggested. Based upon the suggested criterion derived from the derivative relation of implicit function, the SISO pairing which has minimum interaction among control system variables and good control performance can be determined. The relative effect among diagonal gains and off-diagona gains, which was not considered in other criteria, can be explained deterministically Also, the criterion can be easily applied to partial MIMO pairing. This criterion was applied to several examples to illustrate its usefulness in finding the feasible SISO pairing and MIMO pairing