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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Gas
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Journal DOI :
The Korean Institute of GAS
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Volume & Issues
Volume 6, Issue 4 - Dec 2002
Volume 6, Issue 1 - Mar 2002
Selecting the target year
Analysis of PIG Dynamics through Curved Section in Natural Gas Pipeline
Kim D. K. ; Nguyen T. T. ; Yoo H. R. ; Rho Y. W. ; Kho Y.T. ; Kim S. B. ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 1~9
This paper presents simple models for flow and the PIG dynamics when it passes through a
curved section of pipeline. The simulation has been done with two different operational boundary conditions. The solution fur non-linear hyperbolic partial equations for flow is given by using MOC. The Runge-Kuta method is used to solve the initial condition equation fur flow and the PIG dynamics equation. The simulation results show that the proposed model and solution can be used fur estimating the PIG dynamics when the pig runs in the pipeline including curved section. In this paper, dynamic modeling and its analysis for the PIG flow through
curved pipe with compressible and unsteady flow are studied. The PIG dynamics model is derived by using Lagrange equation under assumption that it passes through 3 different sections in the curved pipeline such that it moves into, inside and out of the curved section. The downstream and up stream flow dynamics including the curved sections are solved using MOC. The effectiveness of the derived mathematical models is estimated by simulation results fur a low pressure natural gas pipeline including downward and upward curved sections. The simulation results show that the proposed model and solution can be used for estimating the PIG dynamics when we pig the pipeline including curved section.
Study for Development of Nondestructive Inspection Device in Natural Gas Pipeline Using MFL Technology
Cho S.H. ; Kim D.K. ; Park D.J. ; Park S.S. ; Yoo H.R. ; Koo S.J. ; Rho Y.W. ; Kho Y.T. ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 10~16
This paper introduces developed prototype intelligent pig which detects corrosion on pipeline by using Magnetic Flux Leakage technology. The 8 inch developed MFL(Magnetic Flux Leakage) pig is composed of 5 yokes which magnetize pipeline wall and 45 Hall sensors which detect MFL signal. The designed MFL modules are analyzed by using magnetic circuit method in order to confirm whether pipeline wall is fully saturated. A variety of artificial defects are manufactured on 8 inch diameter steel pipeline in order to acquire MFL signals. So leakage flux of the axial, radial and circumferential component was acquired as defects. The results of this paper show that design technique for 8 inch MFL pig can be applied to large diameter MFL pig and 0.5mm defect depth can be detected.
Development and Measurement Error Compensation of Odometer System for Intelligent PIG
Kim D.K. ; Park S.S, ; Cho S.H. ; Yoo H.R. ; Park D.J. ; Koo S.J. ; Rho Y.W. ; Kho Y.T ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 17~23
This paper introduces the spring-mounted odometer system which maintains the correct contact with the pipe wall and measures the distance along the pipe. The odometer wheel is designed to keep contact to the pipelines inner wall and to generate fifty rectangular pulses per one turn(159.5681mm) during pigging. The pipeline has the defects in various types such as buckles, winkles, cracks, dents, welding point and so on. Specially girth welding points which exist each 12m of the pipeline, much affects the operational environment of the odometer. The measurement error of the distance along the pipe is accumulated, for the measurement error of wheel's circumference and the pipeline inner environment. So, this paper proposes the method for the error compensation based on the analysis of the odometer's behavior around the girth welding point of pipe. The experimental results show that developed odometer system can be used for the intelligent pig with good performances.
A Study on the Management Model for Integrated System of Safety, Health and Environment
Ko Jae Wook ; Kim Sung Bin ; Hong Jae Hun ; Ryu Byung Tae ; Seo Jae Min ; Um Sung In ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 24~31
The enterprise are facing potential SHE(safety, health and environment) accident to cause casualties or a financial loss and increasing social responsibility. So, SHE management system has to be voluntarily accomplished rather than passively with regard to SHE regulation. In this study, KW_SHE(Kwangwoon Safety, Health and Environment) management model is developed which materialize self-regulation SHE management system of individual workplace by the research and analysis of many domestic enterprise. This KW-SHE management model is intend to assess work-product vs. management expenses investment and critically evaluated for studying its benefits and limitations
The Study of Roof Design for LNG Storage Tank
Lee K.W. ; Hong S.H. ; Oh B.T. ; Kim Y.K. ; Kim K.B, ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 32~37
Natural gas became one of the major sources of energy in Korea. As the consumption of natural gas increase, the more capacity of the LNG storage tanks Is required. Recently, Korea Gas Corp.(KOGAS) has developed the technology nt' designing the LNG storage tanks. In this study, some of the finite element analysis has been made for designing of the roof structure of LNG storage tanks. The load case and safety code used In this study were followed by BS7777.
A Study on the Formation of Hydrate Plugging due to water molecules in High Pressure and Low Temperature Gas Pipeline
Lee J. H. ; Baek Y. S. ; Sung W. M. ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 38~45
Hydrates are solid cryctallines resembling ice in appearance, which are consist of a gas molecule surrounded by a cage of water molecules. Because of containning a large amount of methane, hydrates have been considered as a future energy resource. However, the formation of hydrates in the oil and gas industries has been known as a serious problem for a long time. The formation of hydrate in pipeline is common in seasonally cold or sub-sea environments with low temperatures and high pressures. Especially, hydrate plug formation becomes a real menace to flow assurance in inadequately protected transmission lines. This study was carried out for the purpose of understanding mechanism of hydrate plugging and examining formation conditions of hydrate in high pressure gas pipeline. In this study, we measured hydrate equilibrium conditions under the various flowing conditions with the methane. The results were presented both the plugging tendency and the effect of flowing velocity.
Vibration Analysis of Buried Gas Pipeline by Blast Vibration
Jeong S. Y. ; Park C. S. ; Hong S. K. ; Kim J. H. ; Koh J. P. ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 46~51
In subway or road construction, the vibration caused by various construction equipments influences gas pipelines directly or indirectly Especially buried gas pipelines are influenced by the blast occurred near the pipeline buried Place. To analyze vibration response of buried gas pipeline caused by blasting works, the nonlinear behavior of ground is realized by applying equivalent linear analysis. According to the results of this analysis, the acceleration response values of gas pipeline are close to the measured values and the occurring time of peak values are agreed to the measured values. Thus, It is concluded that conventional seismic analysis mechanism can be applied to the dynamic analysis of buried gas pipeline.
Performance Analysis and Development of the Navigation System for Pipeline Inspection Gauge
Jin Yong ; Park Chan Gook ; Woo Rho Yong ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 52~58
The PIG(Pipeline Inspection Gauge) is inserted in the pipeline and stores data of pipeline. In order to investigate the status of pipeline, a lot of sensors such as caliper, pressure, IMU and odometer are used. In this paper, the navigation storage data system for PIG is developed. It has master/slave structure for a real time operation. The master system stores data, while the slave system acquire the data from sensors. The performance of the developed system is verified by pull rig test.
A Study on Process Integrated Innovation System for a LNG Industry
Kim Chung Kyun ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 59~65
This paper presents new IT model, PIIS that integrates the safety control, construction, and operation managements in a conventional gas industry The systemic approach based on the PIIS model may reduce or increase the parameters as maximizing the safety, risk and crisis management, and increasing the cost-effective productivity The rapid synchronization and integration of the process using the PIIS model may produce more profits and satisfactions between customer and gas supplier. Thus, the PIIS model should quickly be introduced to gas industry at the beginning stage of engineering design and construction processes for maximizing production, effectiveness, and safety of the system from the exploration of a natural gas to a final consumption.
Development of the SIS Evaluation Method Based on Reliability Analysis
Kim In-Won ; Jin Sang-Hwa ; Song Kwang Ho ; Yeo Yeong-Koo ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 66~73
In this study a new SIS evaluation method based on the reliability analysis has been developed. It evaluates the Safety Integrity Level (SIL) using the Fault Tree Analysis (FTA), and when the SIL falls short of the systems target level, through the reliability analysis and system retrofit, this method will satisfy the aimed SIL. A hazard evaluation was carried out on the 415V Diesel BUS to verify the SIL evaluation method based on the reliability analysis. The availability of the original 415V Diesel BUS was
, which comes under the category of SIL 2. After exchanging the diesel generator and the isolator switch using the developed evaluation method, the availability rose to
, SIL 3. By applying the method presented in this study, not only will it reduce the maintenance cost due to the prevention of accidents and reduction of loss, but also maximize the reliability of the system.
Investigation of Ventilation Efficiency for the Natural Gas High Pressure Release in an Underground Valve Station
Ha J. M. ; Lee J. H. ; Sung W. M. ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 74~80
This study was carried out for the purpose of safety evaluation about the ventilation system (according to the structure of confined room, the position and size of vent window, the amount of blowing air, e.t.c.), which is equipped in one of KOGAS underground valve stations. Particularly, the effect of the fans placed in the upper region was focused in detail. Numerical simulation was conducted in order to predict the features of flow pattern and the diffusion of natural gas concentration. This work examined the ventilation system and resulted in proposing an optimal design of ventilation system.
A Study on the Release Rate of Hazardous Materials from Liquid Pipeline
Tak Song-Su ; Jo Young-Do ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 81~85
This paper presents the calculation methods of liquid release rate in the transition region when hazardous materials leak from the pipeline due to an unwanted accident. For the laminar and turbulent flow region, liquid release rate from a pipeline can be calculated by using a commercial software or by using calculator based on the models(equations) suggested by Crowl and Louvar et al. However, there has been no corresponding model for the transition flow region. In this paper. we showed that the turbulent model may be used as an equation generally used in the transition region for conservative hazard analysis if safety factor
is added to the value calculated by the turbulent model. In this regard, we first calculated the release rate from liquid pipeline in the transition region by using experimental data on Fanning friction factor depending on Reynolds number which Lap-Mou Tam et al. had introduced, then compared it with that of the laminar and turbulent models in transition region.
A Study on the Equipment Allocation using Reliability Optimization with Discrete Functions
Yeo Yeong-Koo ; Jin Sang-Hwa ; Song Kwang Ho ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 86~91
This study introduces a method that selects equipments, so as to reach the reliability level, carrying out an optimization analysis which considers the reliability data and cost of the equipments. A more practical optimization problem has been formed using the object function based on the discrete function and the constraints. The jacked reactor being the subject, an optimization analysis was performed on equipments that have different failure rates depending on costs in order to reach the target reliability level required by the system. The mixed-integer programming (MIP) was used for this optimization analysis. When the jacked reactors target level of reliability was
, the result of the analysis showed the equipments with high cost and low failure rate were selected. However when the target level of reliability was low, the result showed that by choosing the equipments with lower cost and reliability over the more expensive one, the desired target level could be reached.
The Study on Corrosion Characteristics of Heat Exchanger Tube for Gas Absorption Refrigeration & Hot Water System
Jeong Ki Cheol ;
Journal of the Korean Institute of Gas, volume 6, issue 1, 2002, Pages 92~97
This paper was studied on corrosion characteristics of gas absorption refrigeration & hot water system using
working fluids. In the
lithium bromide solution at
, polarization test of Cu,
Cu-Ni) tube was carried out. And polarization behavior, polarization resistance characteristics, open circuit potential, anodic polarization of heat exchanger tube for gas absorption refrigeration & hot water system were considered. The main results are as following: 1) Polarization resistance of heat exchange tubes appears high in order of
cupronickel tube >
cupronickel tube > Cu tube. B) Open circuit potential of cupronickel tube is more noble than that of Cu tube, and corrosion current density of cupronickel is controlled than Cu tube. 3) Potential of passive region of
cupronickel tube is more wide than that of
cupronickel tube, and the passivation critical current of
cupronickel tube is lower than that of