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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 15, Issue 6 - Dec 2011
Volume 15, Issue 5 - Oct 2011
Volume 15, Issue 4 - Aug 2011
Volume 15, Issue 3 - Jun 2011
Volume 15, Issue 2 - Apr 2011
Volume 15, Issue 1 - Feb 2011
Selecting the target year
Reliability Assessment for Pressure Uprating of Natural Gas Transmission Pipelines
Baek, Jong-Hyun ; Kim, Woo-Sik ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 1~6
DOI : 10.7842/kigas.2011.15.5.001
It is required to construct the pipelines to eliminate pressure drop at the end of transmission line under limitation of maximum operation pressure of 6.86 MPa, however, it highly costs to build the pipelines and takes time-consuming job. Higher operation pressure compared to current operating pressure has been considered to resolve the problem of pressure drop without modification of the existing pipelines and facilities. As a result of the integrity evaluation, the existing pipelines can be operated up to 7.85 MPa in terms of wall thickness and have higher Charpy impact energy than required value in the ASME B31.8. However, Increment of operation pressure gives rise to increase potential impact area if the pipelines burst due to third party damages.
Problem Solving for LPG Storage Tank using RPS-TRIZ
Leem, Sa-Hwan ; Huh, Yong-Jeong ; Lim, Ju-Yeon ; Kim, In-Gyu ; Jeong, Shin-Young ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 7~12
DOI : 10.7842/kigas.2011.15.5.007
LPG(Liquefied Petroluem Gas) Vehicles in metropolitan area being applied to improve air quality and have been proven effective for the reduction of air pollution. These gas stations are required to safe the storage tank because of possibility of causing huge loss of life and property. While storage tanks above ground have potential risk of explosion if fire breaks out and those under-ground are difficult to inspect due to poor accessibility neither above nor under-ground tank can serve us well. This study used the RPS-TRIZ (Rapidly Problem Solving-Teoriya Resheniya Izobretatelskikh Zadatch) technique and suggested the use of under-ground containment storage tank as a solution for safety issues and safety inspection.
Experimental Investigations on the Characteristics of Explosion Mitigations by Different Concentrations of Agar Gel Barriers
Park, Dal-Jae ; Kim, Nam-Il ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 13~18
DOI : 10.7842/kigas.2011.15.5.013
Experimental studies were carried out to investigate the characteristics of explosion mitigations by varying concentrations of agar gel barriers in an explosion chamber, 1400 mm in length, with a square cross-section of
. Another extension chamber,
, was made to hold a gel barrier. Four different gel concentrations were used in the measurements: 2, 3, 4, 5 %(by weight of gel). Displacement of the gel barrier was measured using a high speed camera, and pressure development was measured using pressure transducers and a data acquisition system. It was found that as the concentrations of the gel barriers increased, the gel rupture time and the time taken to reach the maximum pressure increased. It was also found that the increment of gel concentrations increased the reduction percentage in the maximum pressure between before and after gel barrier.
3-Dimensional Finite Element Analysis for Collecting Structure of Combustible Metal Dust During Explosion
Jang, Chang-Bong ; Yong, Jong-Won ; Baek, Jong-Bae ; Kwon, Hyuck-Myun ; Ko, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 19~24
DOI : 10.7842/kigas.2011.15.5.019
Due to the latest industrial flow comes mainly switch to high-tech industries, combustible metals as Al, Mg, Li, Zn more require to use for the aircraft, car, cell phones, electronics and others. As a result, Increasing the processing of combustible metals due to increase in amount of combustible metals giving rise dust explosions also. Most Explosions caused by combustible metal dust, occurred in air cleaning device of local exhaust ventilation to capture and store the combustible dust. Therefore, this study was conducted to present and analyze technically that deformation and rupture shape of air cleaning device structure by Finite Element Analysis(FEA) rather than a simple prediction, in case of explosion occurs in an air cleaning device.
Effects of Biogas Composition Variations on Engine Performance
Park, Seung-Hyun ; Park, Cheol-Woong ; Kim, Young-Min ; Lee, Sun-Youp ; Kim, Chang-Gi ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 25~30
DOI : 10.7842/kigas.2011.15.5.025
Biogas obtained from the biodegradable organic wastes in an anaerobic digester consists of
and inert gases such as
. Since the composition of biogas varies by anaerobic digester conditions and the origin of wastes, it is necessary to respond to these variations so as to make stable combustion and accomplish high efficiency when it is used as a fuel for power generating SI engines. In this study, efforts have been made to investigate the effect of changes in the calorific values of biogas on the engine performance and exhaust characteristics. The biogas was simulated by supplying of
dilution of various ratios, and ECM was developed to achieve accurate control of ignition and combustion. The results show that as the
concentration of the biogas decreases, the optimal spark timing is advanced due to the elevated thermal capacity and lowered
concentration of the in-cylinder charge. Furthermore, since combustion temperature was reduced by increased inert gas,
emissions decreased, whereas THC emissions increased.
Structural Optimization of Cantilever Beam in Conjunction with Dynamic Analysis
Zai, Behzad Ahmed ; Ahmad, Furqan ; Lee, Chang-Yeol ; Kim, Tae-Ok ; Park, Myung-Kyun ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 31~36
DOI : 10.7842/kigas.2011.15.5.031
In this paper, an analytical model of a cantilever beam having a midpoint load is considered for structural optimization and design. This involves creation of the geometry through a parametric study of all design variables. For this purpose, the optimization of the cantilever beam was elaborated in order to find the optimum geometry which minimizes its volume eventually for minimum weight by FEM (finite element method) analysis. Such geometry can be obtained by different combinations of width and height, so that the beam may have the same cross-sectional area, yet different dynamic behavior. So for optimum safe design, besides minimum volume it should have minimum vibration as well. In order to predict vibration, different dynamic analyses were performed simultaneously to identify the resonant frequencies and mode shapes belonging to the lowest three modes of vibration. Next, by introducing damping effects, the tip displacement and bending stress at the fixed end was evaluated under dynamic loads of varying frequency. Investigation of the results clearly shows that only structural analysis is not enough to predict the optimum values of dimension for safe design it must be aided by dynamic analysis as well.
A Study on the Strength Safety of a Composite Hydrogen Fuel Tank for a Vehicle
Kim, Chung-Kyun ; Kim, Do-Hyun ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 37~41
DOI : 10.7842/kigas.2011.15.5.037
This paper presents the strength safety of a hydrogen gas composite fuel tank, which is analyzed using a FEM based on the criterion of US DOT-CFFC and Korean Standard. A hydrogen gas composite tank in which is fabricated by an aluminum liner of 6061-T6 material and carbon fiber wound composite layers of T800-24K is charged with a filling pressure of 70MPa and a gas storage capacity of 130 liter. The FEM results indicated that von Mises stress, 255.2MPa of an aluminum liner inner tank is low compared with that of 95% yield strength, 272MPa. And a carbon fiber stress ratio of a composite fuel tank is 3.11 in hoop direction and 3.04 in helical direction. These data indicate that a carbon fiber gas tank is safe in comparison to that of a recommended criterion of 2.4 stress ratio. Thus, the proposed composite tank with 130 liter capacity and 70MPa filling pressure is usable in strength safety.
Parameter Analysis of the Damage Area and the Financial Loss by the Gas Release Accident at Pressure Vessels
Kim, Bong-Hoon ; Lee, Hern-Chang ; Choi, Jae-Uk ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 42~49
DOI : 10.7842/kigas.2011.15.5.042
To achieve the safety management of an industry by using practical consequence analysis, parameters affecting damage area and financial loss by gas release accident were analyzed at pressure vessels containing flammable gas. As a result, the total financial loss cost was largely effected by the business interruption cost, and it was considered for equipment type and materials, process properties, and circumstances. Also, the consequences of the financial loss must be practically used more than the consequences of the damage area in industry.
Experimental Study on the Performance Characteristics of Air Hybrid Engine
Lee, Yong-Gyu ; Kim, Yong-Rae ; Kim, Young-Min ; Park, Chul-Woong ; Choi, Kyo-Nam ; Jeong, Dong-Soo ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 50~56
DOI : 10.7842/kigas.2011.15.5.050
A preliminary experimental study of new concept air hybrid engine, which stores compressed air in the tank during braking and re-use it to propel vehicle during crusing or acceleration, was carried out in this study. A single cylinder engine was modified to realize the concept of air hybrid engine. Independent variable valve lift system was adopted in one of the exhaust valves to store the compressed air into the air tank during compression period. An air injector module was installed in the place of spark plug, and the stored compressed air was supplied during the expansion period to realize air motoring mode. For air compression mode, the tank with volume of 30 liter could be charged up to more than 13 bar. By utilizing this stored compressed air, motoring work of 0.41 bar of IMEP(Indicated mean effective pressure) at maximum can be generated at the 800rpm conditions, which is higher than the case of normal idle condition by 1.1 bar of IMEP.
A Study of Risk Reduction by SIL(Safety Integrity Level) Determination
Kim, Jung-Hwan ; Kim, Bum-Su ; Yang, Jae-Mo ; Jang, Chang-Bong ; Kim, Min-Seop ; Jung, Sang-Yong ; Ko, Jae-Wook ;
Journal of the Korean Institute of Gas, volume 15, issue 5, 2011, Pages 57~62
DOI : 10.7842/kigas.2011.15.5.057
Modern chemical plants including petroleum refinery and gas industries have evolved into more complex and specialized. In these industrial complexes, it is important to maintain acceptable safety level protecting from various potential disasters caused by fire, explosion and the leakage of toxic materials. Recently possibility and consequence of accidents are increasing in the industrial process. So there is a trade-off between the plant operation efficiency and safety level. In this study SIF(Safety instrument Functions) was incorporated into SIL(Safety Integrity Levels). As a result, the safety level was upgraded by designing resonable allocation of safety instruments.