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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 9, Issue 4 - Dec 2005
Volume 9, Issue 3 - Sep 2005
Volume 9, Issue 2 - Jun 2005
Volume 9, Issue 1 - Mar 2005
Selecting the target year
The Effect of Plastic Working on the Membrane Fatigue Life
Yoon I. S. ; Kim J. K. ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 1~5
An investigation was made on the fatigue characteristics of type 304 stainless steel membrane manufactured by plastic working. To investigate the effect of plastic deformation, tests were performed with 5 types of specimens having different amount of plastic deformation. Fatigue tests were executed under both room and LNG temperatures
. All the test results were compared with the fatigue data provided by RPIS (Recommended Practice for Inground LNG Storage Tank). On the basis of these results, it was confirmed that RPIS's design fatigue curve could be applied to evaluate fatigue life of KOGAS membrane manufactured by pressing
Study on the Damage Behavior of 304 Stainless Steel for Gas Boiler with Specific Resistance
Yun, Byoung-Du ; Lim, Uh-Joh ; Jeong, Ki-Cheol ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 6~10
This paper was studied on the damage behavior of stainless steel (STS 304) for gas boiler with specific resistance. The electrochemical polarization test of STS304 for gas boiler was carried out. And the anodic polarization and damage aspect, such as pitting corrosion, was considered. With being low specific resistance, the passive current density of STS 304 increases, passive region and pitting potential is low. Also, the patting aspect of STS304 In specific resistance
water little appears, the pitting number increases and the damage behavior, such as pitting aspect, gradually grow bigger with being low specific resistance.
The Study on the Mechanical Characteristics of Hydrogen Embrittlement for the Weld Zone of Ferrite Stainless Steel
Choi, Byung-Il ; Lim, Uh-Joh ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 11~16
In this paper, the hydrogen osmosis test and the mechanical tensile test were carried out to examine hydrogen cracking behavior of STS444 with welding conditions. In
solution, the hydrogen embrittlement characteristics of weld zone of STS444 added to load of
together with hydrogen osmosis by current of
for 60 min. was considered. As a result of study on the hydrogen embrittlement and mechanical characteristics of STS444외와 with welding conditions the tensile stress and elongation of STS444 get lower by the absorption of oil or water before welding. Also, the reduction rate of tensile stress and elongation of STS444 is larger because of hydrogen embrittlement by the absorption of oil or water. STS444 by the absorption of water before welding is more sensitive to hydrogen embrittlement than oil.
Adsorption Characteristics of Nitrogen monoxide over Dealuminated and Alkali/Alkaline-earth Metal ion Exchanged Y-Zeolites
Kim, Cheol-Hyun ; Lee, Chang-Seop ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 17~25
The dealuminated and alkali/alkaline-earth metal exchanged Y-zeolites were prepared as a catalyst. Elemental compositions and structures of the prepared catalysts were analyzed by the various spectroscopic techniques such as inductively coupled plasma-atomic emission spectroscopy(ICP-AES), X-ray fluorescence(XRF) and X-ray diffraction(XRD), and the desorption behaviors of adsorbed species on the catalyst surfaces were investigated via NO-TPD experiment. Comparing with the composition of the starting material of NaY zeolite, the magnitudes of Si/Al ratio in catalytic materials were increased after dealumination. The Si/Al ratio of catalytic materials after dealumination followed by Cs and Ba cation exchange were additionally decreased. Dealumination to catalysts induced a destruction of basic frame due to a detachment of aluminum, which results in reducing framework structure, while increasing non-framework structure. This phenomenon becomes more serious with increasing time of steam treatment and even more significant for the cation exchanged catalysts. In NO-TPD experiments, the desorption peaks of NO which indicates an activity point of catalysts shifted to the low temperature region after dealumination and cation exchange. The desorption peaks of the NO-TPD profiles taken after steam treatment also shifted to the low temperature region as the steam treatment time increased. In dealuminated and cation exchanged Y-zeolites, the catalytic activities were more influenced by exchanged cation and the formation of non-framework structure.
Solvent Sensing Properties of Thin Films Based on Zinc phthalocyanine (ZnPc) Compounds
Kim D.H. ; Kang Y.G. ; Kim J.H. ; Roh S.C. ; Kim H.J. ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 26~29
In this paper, the solvent sensing properties of the metallophthalocyanine macrocyclic compounds(ZnPc) have been deposited as thin films by the spin-coated method and evaporated methods onto alumina substrates and quartz substrates. And then the spin-coated materials of Zinc phthalocyanine solutions blended with
solutions. The influences of the blended metallophthalocyanine macrocyclic compounds on the resistance have been measured and analysed in five different vapour organic compounds.
The Study on the Electrochemical Polarization Characteristics of Hydrogen Embrittlement for Ferrite Stainless Steel with Welding Conditions
Choi, Byung-Il ; Lim, Uh-Joh ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 30~35
In order to examine the electrochemical polarization characteristics of hydrogen embrittlement far STS444 with welding conditions, this paper carried out the accelerated hydrogen osmosis test and the electrochemical polarization test. That is, in
solution, the hydrogen embrittlement behavior of STS444 added to load of
together with hydrogen osmosis by current of
far 60 min. was considered. In researching the electrochemical polarization characteristics of hydrogen embrittlement for STS444 with welding conditions, the previous study clarified that tensile strength or elongation became low influenced by absorption of oil or water before welding. In this paper, we proposed the advanced mechanism of hydrogen embrittlement that integrated electrochemical corrosion with the existing mechanism of hydrogen embrirtlement.
Optimized Design of Roof Structure in LNG Storage Tank
Kim, Chung-Kyun ; Kim, Han-Goo ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 36~43
In this paper, the optimized design of a roof structure f3r a LNG outer tank has been analyzed using the Taguchi design method. This method may efficiently optimize the design parameters of a LNG roof structure in terms of H beam and L beam structures, and a thickness of a concrete structure. The FEM computed results indicate that the thickness of a concrete structure is a dominant factor of a roof structure design. The H and L beam structures do not affect a maximum stress and deformation of a reinfarced roof structure. This means that H and L beam structures only support a dead weight of a concrete roof during a consolidation of a reinforced concrete. Based on the computed results by the Taguchi design method, the number of beams and thickness of a reinforced concrete are given as H=30, L=7, and t=1.2m.
Safety Assessment for Hydrogen Gas Production Facilities (Steam Reforming)
Rhie Kwang Won ; Kim Tae Hun ; Kim Jung Keun ; Han Seung Yong ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 44~49
In this study, a process safety evaluation is implemented, in which the process hazards are investigated systematically about hydrogen production plants. Be used qualitative Safety management method such as HAZOP and FMEA. Were analysed potential hazards (human errors or operating failures of every processing steps) about parameters that flow, pressure, temperature of hydrogen production plants through HAZOP that making deviations applied signified guide words. Analysed to using FMEA mainly about bad components or troubles that equipments breakdown and malfunction in facilities and then propose its influences, and counterproposal.
A Study on the Combustion and Explosion Characteristics According to Mixing Ratio of Gas
Oh Kyu-hyung ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 50~56
Liquefied Petroleum 6aso-PG) is combustible gas which used for fuel for domestic and automobiles. A research for adjust a component of LPG to improve the fuel characteristics and control the manufacturing process of that is carrying in petrochemical industry. Some kinds of LPG blending is considered as a adjusting method to control component of LPG. LPG is mainly propane for domestic use and butane for automobile use but propylene and butylene also a kind of LPG Change of explosion characteristic and combustion gas component by mixing of propylene in propane and butane was measured and analysed in this research. Based on the result of experiment, it was found that explosion pressure and pressure rise rate was slightly increased with mixing rate of propylene and it was considered the possibility of increasing the CO concentration in combustion gas with increase the mixing rate of propylene.
The Comparative Quantitative Risk Assessment of LNG Tank Designs for the Safety Improvement of Above Ground Membrane Tank
Lee S.R. ; Kwon B.G. ; Lee S.H. ;
Journal of the Korean Institute of Gas, volume 9, issue 4, 2005, Pages 57~61
The objective of paper is to carry out a comparative Quantitative Risk Assessment (QRA) of two KOGAS tank designs using a fault tree methodology, a standard 'Full Containment' tank and a 'Membrane' tank. For the membrane tank, both the initial KOGAS design and 4 modified KOGAS designs have been assessed, giving six separate cases. In this paper, the frequencies of releases are quantified using a fault tree approach. For clarity in the analysis, and to ensure consistency, all cases have been quantified using the same fault tree. Logic within the fault tree is used to select each of the cases. Full quantification of risks is often difficult, owing to a lack of relevant failure data, but the aim of this study has been to be as quantitative as possible, with full transparency of failure information. The most significant general cause of external LNG leaks is predicted to be a seismic event, which has been quantified nominally. 4modified KOGAS desiens to Prevent damage of bottom membrane panels that was shown in preparatory estimation could quantitively confirm safety improvement. According to result, the predicted frequencies of an external LNG leak for the full containment and modified membrane tanks are very similar, failures due to dropped pumps are predicted to be significantly greater for the membrane tank with thickened plate than for the full containment tank.