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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 8, Issue 4 - Dec 2004
Volume 8, Issue 3 - Sep 2004
Volume 8, Issue 2 - Jun 2004
Volume 8, Issue 1 - Mar 2004
Selecting the target year
AE Characteristic of Polyethylene Pipe under various defects
Nam Ki Woo ; Lee Si Yoon ; Ahn Seok Hwan ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 1~7
The polyethylene pipe can use semi-permanent because of the high corrosion resistance with chemical stability. In addition to, there is the merit that is an easy to establish and to maintain. However, as the reason that it is simply degraded when the polyethylene pipe was exposed to the outside, mainly it is used to lay under the ground with low-pressure gas transportation pipe. In this study, the nondestructive evaluation method was used to maintain the integrity of the polyethylene pipe. We simulated the various defects on the polyethylene pipes, and then the AE signal occurred according to the impact test of steel ball was evaluated by the acoustic emission method. From the results, the waveform and dominant frequency could be distinguishing from the defect shapes of polyethylene pipe. Especially, in the case of notch defect, the AE signals occur different by the angle and depth of the notch.
FE Analysis on the Design Safety of Inner Tank Bottom Plate in Terms of Cryogenic Temperature Loadings
Kim Chung Kyun ; Cho Seung Hyun ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 8~15
This paper presents von Mises stress, deformation, and rotating distortion moment characteristics of inner tank bottom plate as a function of a cryogenic temperature difference along the radial distance from the center area to the corner one. The calculated results show that the filling level of LNG at the beginning of the cool-down process is very important for the design safety analysis of the inner tank. Obviously the thermal loading by a temperature difference between the LNG vapor gas of
and a LNG temperature of
affects to the thermal related characteristics of the bottom plates and annular one. From the computed results, the temperature difference by a vapor gas and liquid of LNG may lead to the thermal instability of the bottom plate. This phenomenon may cause the system failure of an inner tank.
Analysis of a Hydrogen Generation Membrane Reactor
Kim Hyung Gyu ; Suh Jung Chul ; Baek Young Soon ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 16~23
A membrane reactor concept, which combines the typical characteristics of chemical reaction with separation process, has been analyzed and simulated in this study. The advantages of the use of a membrane reactor include chemical equilibrium shift towards higher reactant conversion and purer product than the traditional reactors. A membrane reactor model which incorporates a catalytic reaction zone and a separation membrane is proposed. The water-gas shift reaction to produce hydrogen was chosen as a model reaction to be investigated. The membrane reactor is divided into smaller parts by number of n and each part (named cell), which contains both reaction and product separation function is modeled. One of the membrane outlet streams is connected to the next cell, which is repeated up to the last cell. The simulation results can be used for various purposes including decision of optimum operating condition and membrane reactor design.
Observation of Gas Hydrate Formation by View Cell
Cho Byoung-Hak ; Lee Young-Chul ; Mo Yung-Gi ; Baek Young-Soon ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 24~30
Gas hydrate formation process is studied in this paper. Natural gas was introduced into both pure water and water added anionic surfactant(promotor) at 276.65 K and 6 MPa. Gas hydrate nuclei was easily generated by instantaneous agitation. Gas hydrate film was formed on the interface of water and gas. The very thin film which was instantly covered the surface of the water, followed by generation of the clear film layer. Whiskery crystal of gas hydrate was created more actively in the water added naionic surfactant than in the pure water. Whiskery hydrate formed in the pure water looks like short and thick thread colony while the one shoes long and thin thread colony in the water added promoter.
Study for Non-Destructive Testing of Polyethylene Electrofusion Joints - Ultrasonic Imaging test
Kil Seong Hee ; Kwon Jeong Rock ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 31~36
Electrofusion(EF) joints have been widely used as they are easy to fuse and suitable for high-quality joints for polyethylene(PE) pipes. This paper studies the cause of defects and classifies 5 types of defects. The defect detection technique for electrofusion joints of polyethylene piping is utilized by the ultrasonic phased array technique to obtain ultrasonic images of electrofusion joints. Test sample joints have been designed and fabricated using artificial defects which were made using paper. Finally, we studied the condition of electrofusion in the field and analyzed the main causes of defects. And we classified the defect types as local lack of fusion, sand inclusion, voids or air inclusion, short stab, excess penetration or excess bead.
Assessment of Safety Management Cost with Accident Scenarios at Gas Governor Station
Kim Tae-Ok ; Jang Seo-Il ; Kim So-Mi ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 37~42
This study established a catastrophic scenario and a likely scenario by qualitative and quantitative risk assessments to consider climate condition with season, and assessed efficiency of safety management cost with scenarios by cost-benefit analysis. As results, the catastrophic scenario was the maintenance error for unsteady state operation, and the likely scenario was the gas release accident at node
4 of HAZOP Also, benefit/cost ratios for total safety management cost and effective items of safety management could be assessed at each scenario.
Study for Transport and Separation Mechanisms of
Mixture on Organic Templating Silica/Alumina Composite Membrane by Using Generalized Maxwell Stefan model
Lee Chang-Ha ; Moon Jong-Ho ; Kim Min-Bae ; Kang Byung-Sub ; Hyun Sang-Hoon ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 43~51
In this study, gas permeation and separation characteristics of
on nano-porous TPABr(Tetrapropylammoniumbromide) templating silica/alumina composite membrane were studied by using GMS (Generalized Maxwell Stefan) model. Since the transport mechanisms of meso-porous alumina support are Knudsen diffusion and viscous diffusion(or poiseulle flow), they can be identified by DGM (dusty gas model). The transport mechanism of TPABr templating silica layer, which would contribute mainly to the separation of
mixture, showed surface diffusion rather than pore diffusion. Therefore, the oermeationjseparation mechanisms in multi-component suface diffusion were successfully analyzed by the GMS model. In the separation of
mixture using the composite membrane,
, the strongadsorbate, was permeated through the membrane more than Na due to the pore-blocking phenomena of
by adsorption isotherm and solace diffusion.
A Study of Combustion Reaction of Methane by Pd Catalyst - Effects of Support Size & Calcination Temperature -
Lee Taeck Hong ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 52~56
Pd catalyst have been used in hydrogenation, oxidation, and low temperature combustion reaction. Recently, it is candidated as a possible reagents in the partial oxidation of methanol reformers of the fuel cell. Pd catalysts, even though it is very precious and expensive, catalytic functioning is good, but it still need to be improved in the matter of durability and low catalytic activity after calcination. In this study, we synthesize the improved Pd catalyst and study their chemical functioning.
A Safety Assessment for 140,000kl
Ni Steel Type LNG Storage Tank
Lee Su Kyung, ; Yang Byung Dong, ;
Journal of the Korean Institute of Gas, volume 8, issue 3, 2004, Pages 57~62
This study is to assess the safety of the process facilities and fire fighting facilities for LNG storage tank which is the main facility in the LNG receiving terminal. The LNG storage tank(capacity : 140,000kl, type : aboveground, inner tank
Ni steel plate, outer tank : prestressed concrete) was designed by foreign country up to now, but it has designed by domestic technology as the fifth in the world is under construction now.