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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
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Volume & Issues
Volume 5, Issue 4 - Dec 2001
Volume 5, Issue 3 - Sep 2001
Volume 5, Issue 2 - Jun 2001
Volume 5, Issue 1 - Mar 2001
Selecting the target year
A Study on the Visualization of Ice-formation Phenomena of Bath Water to Decide Maintenance Period of Gas Heater
Lee J. H. ; Ha J. M. ; Sung W. M. ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 1~8
This study was carried out for the purpose of determination of maintenance period and investigation of weak point due to freeze when the gas heater of KOGAS valve station Is not operated in winter season. 3-dimensional non-linear numerical simulation was conducted in order to predict the time and location which bath water in heater reaches to ice point. FLUENT V 5.0, commercial code, is used for thermal fluid flow analysis. We thought this was problem of heat conduction solving the energy equation and modeled gas heater by using the real geometry and scale for performing the 3-dimensional simulation. It was analyzed complex heat transfer phenomena considering convection due to air on surface, conduction in insulation material, natural convection of liquid in heater and heat loss through the pipe.
Seismic Analysis of Gas Pipelines Subjected to Permanent Ground Deformation
Koh Jae Pyl ; Lim Yun Mook ; Lee Kangwon ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 9~14
Assessment of Fracture Characteristics of Natural Gas Pipeline Weldment According to the Change of Microstructures
Ju Jang-Bog ; Lee Jung-Suk ; Jang Jae-il ; Kim Cheol-man ; Kim Woo-sik ; Kwon Dongil ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 15~22
Reliability evaluation of welded structures by mechanical testing of weld heat-affected zones (HAZs) has become general practice throughout the world. HAZs of steel welded Joints show a gradient of microstructure from the fusion line to the unaffected base metal. This study is concerned a correlation between the microstructural change and the fracture characteristics in HAZs of both seam and girth welds of API 5L X65 pipeline steel, which is generally used for natural gas transmission pipelines in Korea. The focus in this study is the investigation of macroscopic fracture behavior of the various regions within HAZ. Changes in microstructure and toughness were observed using actual HAZ specimens. To evaluate the macroscopic toughness of actual HAZ, Charpy V-notch impact test and CTOD test were performed.
Study on the improvement of BOG recondensation process at LNG receving terminal
Baek Y. S. ; Kim D. H. ; Ha J. M. ; Park Y. ; Yoon I. K. ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 23~28
BOG(Boil Off Gas) is formed about 0.05 vol
/day from LNG tanks of LNG receiving terminal. To recycle the BOG using LNG cold energy, the quantities of LNG and BOG is mixed at the ratio of 11 : 1 by mass in the recondenser of mixing drum type. However, this process is inefficient in the view of energy. It is the most necessary for improvement BOG recondensing process to reduce LNG quantities supplying to recondense system. Therefore, this study has aimed to propose heat exchanger type and suggest results through the analysis of ASPEN PLUS simulator and feasibility study.
A Study on the Characteristics for AC Corrosion of Gas Pipelines
Bae Jeong-Hyo, ; Ha Tae-Hyun, ; Lee Hyun-Goo, ; Kim Dae-Kyeong, ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 29~35
Direct current corrosion have being investigated by lots of scientists but alternating current corrosion was ignored because the corrosion rate by AC was very small. Recently however, AC corrosion accidents have been reported in many other countries. So the study of AC corrosion is to be necessary In these days. In this paper, several experiments which intentionally imposed the AC or DC to the specimens also imposed AC and DC at the same time was carried out in the laboratory to examine the AC corrosion characteristics and in addition applied the same way in the field. Moreover, while the field investigations of the abnormal corrosion failures, It was the AC that caused one of corrosion failures.
Optimization of Odor Concentration by Operation of Small Station Odorizer
Lee Seung-Ho ; Song Taek-Yong ; Baek Young-Soon ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 36~44
In case of low odor level, accident probabilities are very high Otherwise, when the odorant concentration is too high, the deterioration of pipeline and governor facilities and the environmental problems may occur. Odorants fade in the pipeline and other equipment due to physical and chemical adsorption and reactions with odorant and materials. So, it is very important to maintain odorant concentration properly In this study, the current status of odorization technologies has been reviewed. And the characteristics of small odorant system have been analyzed. In case that the small odorant system Is introduced in our country, this paper is proposed the feasible management plan and showed feasibility results through the analysis of current available technology.
The Development and its Application of Diagnostic Technique for Corrosion Defect of U-type Open Rack Vaporizer
Jang S. Y. ; Lee S. M. ; Oh B. T. ; Kho Y. T. ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 45~50
Open rack vaporizer (ORV) has been used in liquefied natural gas (LNG) receiving terminal in order to vaporize LNG into natural gas (NG) by heat exchange with seawater The U-type ORV which had been operated with seawater for 14 years is one of the important utilities of the gas production and the weld part of tube connected with header_ pipe had experienced many corrosion problems. To elucidate the cause of corrosion at weld part of vaporizer tube, corrosion potentials were compared by parts. This study concerns on the measurement of corrosion pit depth using non-destructive method and the evaluation of stress distribution in an aspect of safety with finite element analysis. In order to confirm the reliability of galvanic corrosion between weld parts and base metal, the measurement of corrosion potential by parts was conducted for 20 minutes in 3.5
(wt.) NaCl solution. Many non-destructive methods were tried to measure the remaining thickness of vaporizer tube at fields. For general corrosion, tangential radiography test was confirmed as an effective method. In case of a fine corrosion pit, the shape of corrosion pit was reproduced using surface replication method. From collected data, stress distributions were quantitatively evaluated with 2-dimensional finite element method and the diagnostic evaluation on internal pressure of the U-type vaporizer could be made.
Dynamic Analysis of Surface Foundation Using Half-space Fundamental Solution
Lee Kangwon ; Koh Jae-Pil ; Cho Woo Yeon ; Kim Moon Kyum ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 51~54
An analysis of the influence on the formation kinetics of methane hydrate
Lee Young Chul ; Cho Byoung Hak ; Baek Young Soon ; Lee Woo Jin ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 55~62
This paper describes about the formation of methane hydrate that is artificially made in jacket-type stirred reactor and is observed the change of hydrate shape during the course of reaction. The combustion of manufactured methane hydrate is showed the probability of a storage and transport of gas. And the influence of various experimental conditions of temperature, pressure and stirring rate on the manufacture of methane hydrate is measured. The growth rate and the induction time of methane hydrate is observed according to the conditions. Especially it is important to investigate the effect of temperature and pressure on the growth of hydrate such as the nuclear creation and the structure formation of hydrate in order to study the storage and transport of gas.
Corrosion Rate of Buried Pipeline by Induced Alternating Current
Song H. S. ; Kim Y. G. ; Lee S. M. ; Kho Y. T. ; Park Y. S. ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 63~72
An alternating current (AC) corrosion using coupon and electric resistance (ER) probe has been studied. Coupon coupled with ER probe were applied in terms of AC voltage from high value to low value through the survey of AC voltages on buried gas transmission pipeline over the country. Parameters such as AC current density of coupon, AC voltage, cathodic protection potential, soil resistivity and frequency were monitored continually. Corrosion induced by AC was observed even under cathodically protected condition that met cathodic protection criterion (below -850mv vs. CSE). Corrosion rate was affected mainly not by AC voltage but by both of frequency and AC current density. An experimental corrosion rate relationship could be obtained statistically, In which AC corrosion rate increased linearly with effective AC current density and its slope was 0.619 in case of coupon and 0.885 in case of ER probe.
Design concept investigation for corner protection of LNG storage tank by ASME section VIII, Div. 2
Kim Hyoungsik ; Hong Seongho ; Seo Heungseok ; Yang Youngchul ;
Journal of the Korean Institute of Gas, volume 5, issue 3, 2001, Pages 73~79
The corner protection which is consist of insulation and
nickel liner is designed to mitigate the high hoop tension at the corner of LNG storage tank by LNG leakage. So the design loads depend on thermal and liquid pressure from leaked LNG In this paper design conditions are suggested as operating, major and minor leak conditions. And in order to check integrity of comer protection for the design conditions by appendix 4 in ASME section VIII div.2, acceptability checking process that have stress categorization and finite element analysis is explained.