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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 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
Selecting the target year
A Study on Stress Assessment of Standing Gas Pipeline Subjected to Ground-Subsidence
Kil, Seong-Hee ; Kim, Byung-Duk ; Kwon, Jeong-Rock ; Yoon, Kee-Bong ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 1~8
DOI : 10.7842/kigas.2013.17.2.1
In this study, 120 cases of damage due to ground subsidence of city gas pipeline which is hanging on apartment outer wall were investigated. From the survey results, it was determined to be approximately 100m~200mm ground subsidence occurred and at severe damage, pipeline was cut and the gap was about 50mm between two cut pipeline. Device for measuring the amount of deformation of standing gas pipeline was designed and fabricated. And installed it on apartment outer wall for measuring the deformation due to ground subsidence, after 5 months measurement the amount of ground subsidence was measured to 1.3mm. Stress assessment was conducted based on results of ground subsidence occurred on standing gas pipeline.
An Analysis of Relationship between Cushion Gas and Gas Withdrawal in Depleted Gas Reservoir as a Gas Storage
Han, Jeongmin ; Kim, Joohyung ; Sung, Wonmo ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 9~20
DOI : 10.7842/kigas.2013.17.2.9
Depleted gas reservoir has been already explored and its geologic data, along with its reservoir properties, are already known through seismic exploration and drilling. Therefore it would be less difficult to develope a gas storage from depleted gas reservoir. Cushion gas which remains in the reservoir to maintain pressure affects withdrawal rate of working gas in underground gas storage. In this study, we attempted to investigate the relationship between cushion gas and withdrawal rate using a commercial simulator. From the analyses of the results, it is found that the minimum limit for a cycle of 5-month injection and 5-month withdrawal is 10 wells with 50% cushion gas, and 12 wells with 60% cushion gas for a cycle of 7-month injection and 3-month withdrawal.
Prediction of Autoignition Temperature of n-Propanol and n-Octane Mixture
Ha, Dong-Myeong ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 21~27
DOI : 10.7842/kigas.2013.17.2.21
The lowest values of the AITs(Autoignition temperatures) in the literature were normally used fire and explosion protection. In this study, the AITs of n-Propanol+n-Octane system were measured from ignition delay time(time lag) by using ASTM E659 apparatus. The AITs of n-Propanol and n-Octane which constituted binary systems were
, respectively. The experimental ignition delay time of n-Propanol+n-Octane system were a good agreement with the calculated ignition delay time by the proposed equations with a few A.A.D.(average absolute deviation).
A Study on the Monitoring Criteria of Disaster Signs for Early-warning System based on Multiple Hazardous Gas Sensor
Han, Kyusang ; Park, Sosoon ; Yoon, En Sup ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 28~35
DOI : 10.7842/kigas.2013.17.2.28
The number of large and complex buildings is growing and they are usually concentrated in metropolitan cities. There is a possibility in such buildings that a small accident can expand to a massive disaster since their scale and complexity. To deal with this issue, a research on gas sensors which can detect multiple gases and early-warning systems has been conducted. Proper criteria or standards are necessary for effective application and operation of such sensor-based disaster monitoring system. In this study, we have proposed the alarm criteria of concentration of hazardous gases for the detection and the alarm release. For each alarm level, systematic disaster response plans consist of responsive actions and information delivery have been prepared. These disaster monitoring criteria can help the detection of hazardous gas-related disaster in the early stage of accident and the provision of appropriate emergency responses.
The Analysis of ECBM Efficiency about Sorption Rate between CH
Kim, Kihong ; Sung, Wonmo ; Han, Jeongmin ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 36~43
DOI : 10.7842/kigas.2013.17.2.36
In order to asses gas production behavior for
ECBM, the sorption charcteristics on coal are considered to be a key factor. In this study, we have investigated the change of the sorption rate of adsorbed gas as a function of pressure and temperature below the appropriate depth for
-ECBM. The experiment were carried out under four different temperatures varying from
, while the coal pressure was varied from atmosphere to 1,400 psi for every temperature. From this results, the sorption rate both
increased with increasing the coal pressure. Otherwise, the sorption rate both
decreased linearly as the coal temperature increased. From the sensitivity studies on pressure and temperature change, it was experimentally identified that
sequestration rate and
production rate are better at deeper depths below a depth of 800 m in coal seams. However, the results showed continued decline in the increasing ratio of ECBM with formation depth.
A Study on the Consequences of Underground High Pressure Natural Gas Pipelines
Lee, Seungkuk ; Shin, Hun Yong ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 44~49
DOI : 10.7842/kigas.2013.17.2.44
Due to rapid rise of consuming rate for natural gas, installation and operation of high pressure natural gas pipeline is inevitable for high rate of gas transportation. Accordingly incidents on the underground high pressure natural gas pipeline come from various reasons will lead to massive release of natural gas and gas dispersion in the air. Further, fire and explosion from ignition of released gas may cause large damage. This study is for release rate, dispersion and flash fire of natural gas to establish a safety management system, setting emergency plan and safety distance.
Safety Assessment of By-product Gas Piping after Design Change
Yoon, Kee Bong ; Nguyen, Van Giang ; Nguyen, Tuan Son ; Jeong, Seong Yong ; Lee, Joo Young ; Kim, Ji Yoon ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 50~58
DOI : 10.7842/kigas.2013.17.2.50
Various process piping usually carries out high flammable and explosible gas under high pressure and high temperature. Due to frequent change of design and structure it becomes more complicated and compactly located. The safety management level is relatively low since it is considered as simply designed component. In this study a safety assessment procedure is proposed for complicated piping system around a mixing drum in which natural gas and by-product gases were mixed. According to ASME code, pipe stress analysis was conducted for determining design margin at some key locations of the piping. These high stress locations can be used as major inspection points for managing the pipe integrity. Sensitivity analysis with outside temperature of the pipe and support constraint condition. Possible effect of hydroen gas to the pipe steel during the previous use of the by-product gas was also discussed.
A Study on Production Well Placement for a Gas Field using Artificial Neural Network
Han, Dong-Kwon ; Kang, Il-Oh ; Kwon, Sun-Il ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 59~69
DOI : 10.7842/kigas.2013.17.2.59
This study presents development of the ANN simulator for well placement of infill drilling in gas fields. The input data of the ANN simulator includes the production time, well location, all inter well distances, boundary inter well distance, infill well position, productivity potential, functional links, reservoir pressure. The output data includes the bottomhole pressure in addition to the production rate. Thus, it is possible to calculate the productivity and bottomhole pressure during production period simultaneously, and it is expected that this model could replace conventional simulators. Training for the 20 well placement scenarios was conducted. As a result, it was found that accuracy of ANN simulator was high as the coefficient of correlation for production rate was 0.99 and the bottomhole pressure 0.98 respectively. From the resultes, the validity of the ANN simulator has been verified. The term, which could produce Maximum Daily Quantity (MDQ) at the gas field and the productivity according to the well location was analyzed. As a result, the MDQ could be maintained for a short time in scenario C-1, which has the three infill wells nearby aquifer boundary, and a long time in scenario A-1. In conclusion, it was found that scenario A maintained the MDQ up to 21% more than those of scenarios B and C which include parameters that might affect the productivity. Thus, the production rate can be maximized by selecting the location of production wells in comprehensive consideration of parameters that may affect the productivity. Also, because the developed ANN simulator could calculate both production rate and bottomhole pressure, respectively, it could be used as the forward simulator in a various inverse model.
A Study on the Steam Hammering Characteristics by Sudden Closure of Main Stop Valve in the Main Steam Piping System of a Power Plant
Ha, Ji-Soo ; Lee, Boo-Youn ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 70~77
DOI : 10.7842/kigas.2013.17.2.70
The present study has been carried out to analyze the effect of steam hammering on the steam piping system including the final superheater, the high pressure turbine, check valve and the first reheater by sudden stoping of main stop valve in a power plant. For the present steam hammering analysis, the well known Flowmaster software has been used to model the steam piping system and the time dependent characteristics of pressure and steam mass flow rate has been conducted. Using the result of the unsteady pressure and steam mass flow rate, the forces acting on the elbows in the piping system has been derived. From the present analysis, it has been elucidated that the elbow just before the main stop valve and the elbow near the connection pipe between bypass pipe and check valve had the largest force among the elbows in the steam piping system. The structural safety diagnostics study on the elbow and the supporting structures of the steam piping system of a power plant will be conducted in the future by the present results of the forces acting on the elbow.
A Numerical Study on the Heat and Fluid Flow in Steam Reforming Reactor
Han, Jeongok ; Lee, Joongseong ; Lee, Yeongcheol ; Hong, Seongho ; Hong, Sungkook ; Dong, Sangkeun ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 78~84
DOI : 10.7842/kigas.2013.17.2.78
A numerical study on the heat and fluid flow has carried out for the design of the steam reforming reactor which consists of six reforming tubes and one burner. Reforming reaction calculation is coupled with the heat and fluid flow one. The burner type in the reforming reactor is chosen through the fluid flow calculation according to different type of burner structure. It is shown that the significant temperature gradient exists in the reforming reactor, affecting the component variation along the length of reforming tube. The component ratio of reforming gas is changed by the variation of SCR and GHSV.
An Assessment of Structure Safety for Basic Insulation Panel of KC-1 LNG Cargo Containment system under Sloshing Load
Jin, Kyo-Kook ; Oh, Byung-Taek ; Kim, Young-Kyun ; Yoon, Ihn-Soo ; Yang, Young-Chul ;
Journal of the Korean Institute of Gas, volume 17, issue 2, 2013, Pages 85~89
DOI : 10.7842/kigas.2013.17.2.85
The purpose of the development of KC-1 LNG cargo containment system is reduction in royalty and increase in competitiveness of shipbuilding industry. An assessment of structure safety for LNG cargo containment system under sloshing load due to ship motion has become an important design element. The ideal way is to implement fully interaction of the fluid domain and the cargo containment system. However the irregular sloshing pressure were idealized in the form of a triangular wave for safety assessment because the fluid- structure interaction analysis is taken the extensive computation time and difficult to ensure the accuracy of the results. In this study, the sloshing load was assumed to be a triangular wave with a maximum pressure of 10 bar during 15/1000 seconds. In the analytic results, the basic insulation panel of KC-1 LNG cargo containment system was assessed to be structurally safe for sloshing load.