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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 10, Issue 4 - Dec 2006
Volume 10, Issue 3 - Sep 2006
Volume 10, Issue 2 - Jun 2006
Volume 10, Issue 1 - Mar 2006
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Applicability to Gas Engine and Small Sized Generator of Low Caloric Synthetic Gas Fuel from Coal Gasification
Kim Tae-Kwon ; Kim Sung-Roon ; Jang Jun-Young ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 1~6
This paper presents the applicability of low caloric synthetic gas from coal gasification to a gas engine system and small sized generator. A commercial LPG engine is modified to use the low caloric synthetic gas from coal gasification as the gas engine fuel. The modification is focused on the fuel supplying system, which includes air flowrate adjusting orifice, gas mixer, vaporizer, preheater, regulators, and fuel tank. From the results of engine performance data, we have demonstrated that the engine modified by using the coal gasification gas is well operated from idle to wide open throttle conditions although the engine power is somewhat reduced relative to LPG fueled engine. And we have also demonstrated that the generator is well operated with various loads.
Estimation of Local Stress Change of Wall-Thinned Pipes due to Fluid Flow
Kim Young-Jin ; Song Ki-Hun ; Lee Sang-Min ; Chang Yoon-Suk ; Choi Jae-Boong ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 7~12
In this paper, a new evaluation scheme is suggested to estimate load-carrying capacities of wall thinned pipes. At first, computational fluid dynamics analyses employing steady-state and incompressible flow are carried out to determine pressure distributions in accordance with conveying fluid. Then, the variational pressures are applied as input condition of structural finite element analyses to calculate local stresses at the deepest point. The efficiency of proposed scheme was proven from comparison to conventional analyses results and it is recommended to consider the fluid structure interaction effect for exact integrity evaluation.
Application of Risk Based-Inspection for the Safety Improvement of the Chemical Facilities
Kim Tae-Ok ; Lu Hern-Chang ; Shin Pyong-Sik ; Choi Byung-Nam ; Jo Ji-Hoon ; Jeong Seong-Gweong ; Ki O-Hwan ; Shin Dong-Il ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 13~19
As a way of improving the safety of the facilities, the risk based-inspection (RBI) was executed for the chemical facilities by using K-RBI program, which has been developed based on the API-581 based resource document (BRD). As the result of the evaluation, we found the level of the process safety management (PSM) for the applied plant, quantitative risk of the applied process, risk of static facilities and pipes, and the damage mechanism of the facilities. Thus, we could suggest a proper inspection frequency using the calculated risk of the process and the status of the facilities. The applied plant achieved a reduced inspection cost by an extension of the inspection frequency, improved productivity, improved reliability of the facilities, and a computerized history management.
A Study of Stress off City Gas Pipe Attached on the Bridge
Lee Su-Kyung ; Lim Bong-Gwan ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 20~26
The survey team has conducted the on-the-site inspection of 53 bridges to which LNG gas pipelines are attached, to ascertain their level of safety, durability and any defect by adapting a method of computer data input process and precision analysis. In this way, we could estimate an effective corrective action on the defective gas pipelines found through this survey. Our survey team has analyzed carefully these 2 defective lines selectively out of 10 lines, which are considered to be most seriously weak. According to our elaborate analysis these two pipelines go over 70% of the set standard stress based on our Safety Manual Scale. We have taken corrective actions on these lines by repairing/replacing/obsolete damaged lines to ensure the distress of the bridges involved with the pipelines and could secure safety.
Leakage Effect on the Exit Pressure in a Gas Pipeline
Chang Seung-Yong ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 27~33
This paper investigates leak effect on the outlet pressure at pipeline exit. A modified Weymouth equation(including inclination effect) was used for this study. To investigate leak effect, outlet pressure and ratio of outlet to inlet pressure were compared between no leak and leak conditions for horizontal, upward and downward flows, respectively. Then, effects of leak location as well as leak rate on the outlet pressure were also investigated for all pipeline inclinations.
A Study on the Optimized Design of O-rings for LPG Filling Unit
Kim Chung-Kyun ; Kim Do-Hyun ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 34~40
This paper presents the optimized design of O-rings with a rectangular groove and dovetails, which are strongly related on the sealing performance of LPG filling unit. The computed results on the optimal design are analyzed by non-linear MARC finite element program with Taguchi method. O-rings with 4 different groove models are analyzed for 3 different elastomeric materials. The design parameters are given to polymer materials, groove depth, groove width, and diameter of O-rings. The FEM computed results showed that the affection ratios of O-ring diameter and material property are the most influential parameter among the groove width, groove depth, and compression ratio. Thus, this paper recommends model III for a rectangular groove and model IV for a dovetail groove with a given gas supply pressure of 1.764 MPa.
Analysis of Stray Current Interference between Underground Pipelines and DC Electric Railways
Ha Y.C. ; Bae J.H. ; Ha T.H. ; Lee H.G. ; Kim D.E. ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 41~47
When an underground pipeline runs parallel with DC electric railways, it suffers from electrolytic corrosion caused by the stray current leaked from the railway negative returns, i.e., the rails. Perforation due to the electrolytic corrosion may bring about large-scale accidents even under cathodically protected condition. Traditionally, drainage bonding methods have been widely used as a mitigation method for stray current interference. In particular, the increased adoption of forced drainage method to gas pipelines makes the interference much more sophisticated. In this paper, we analyze the electric interference between pipelines and railways from the results of field investigation carried out in Seoul and Busan.
Consequence Analysis of Gas Explosion in LPG Vessel Retail Store Which is Located around Apartment Complex
Lee Su-Kyung ; Bae Young-Bum ; Oh Jeong-Gyu ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 48~53
In case of fire and explosion which resulted from LP gas release of LPG vessel retail store, the populated area such as apartment complex is supposed to be damaged either partially or totally. To estimate the damage of LP gas explosion, we conducted quantitative risk analysis procedure as has been recommended by AIChE/CCPS. For incident scenario selection, event tree analysis was proposed. TNT equivalent method, SAFER Trace v.8.0 and probit model were also used for consequence analysis. The various methods and analyses which were performed in this study are presented with the effect zones in the layout.
Development of a Shut-off Device of LP Gas Regulator for Home Use
Kim Young-Gyu ; Kim Pil-Jong ; Kwon Boo-Kil ; Park Gyo-Shik ; Kim Ji-Youn ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 54~59
A safety device with shut-off function was developed for preventing intentional accidents that might happen by separating of cutting hoses connected to pressure regulators used in residential LP gas facility. For the verification of function and field adaptability, the safety device with shut-off function was tested in the state of joining the device to the regulator and a field test was carried out at home. This study shows that, at the inlet pressure of 0.07-1.56 MPa, the device shuts off the gas within the 5m length of hose regardless of the installation condition of the regulator. The shut-off flow rate increases in the order of perpendicular upward, horizontal and perpendicular downward. From the results of the field tests carried out at home for 5 months, there appears no problem using a gas range or a boiler. If the developed shut-off device is commercialized and distributed in the market the intentional accidents occurred by cutting or separating hoses can be prevented remarkably.
A Study on the Explosion Characteristics of by Product Gas of Carbon Black Manufacturing Process
Oh Kyu-Hyung ; Lee Sung-Eun ;
Journal of the Korean Institute of Gas, volume 10, issue 3, 2006, Pages 60~64
Explosion range and explosion characteristics of by product gas from carbon black manufacturing process were studied. About 75% of the by product gas were composed with water vapour and nitrogen. And the combustible component in the gas were hydrogen, methane, acetylene and carbon mono-oxide. Because of the combustible components in the by product gas there are explosion hazards in the gas handling process. Explosion range of the gas by experiment was from 17.1% to 70.7% and the value has considerable difference with the calculated value from Lechatelier law. Explosion pressure of the gas was
and the average explosion pressure rise rate was
. Based on the experimental result we can expect that a explosion or fire accident during the handling the gas can make a severe loss, therefore there should be a explosion prevention or protection measures in the gas handling process.