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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 16, Issue 6 - Dec 2012
Volume 16, Issue 5 - Oct 2012
Volume 16, Issue 4 - Aug 2012
Volume 16, Issue 3 - Jun 2012
Volume 16, Issue 2 - Apr 2012
Volume 16, Issue 1 - Feb 2012
Selecting the target year
RFID Applicability Study to Prevent the Third Party Accident of LNG Pipe Line
Han, Sang-Wook ; Park, Su-Ri ; Kim, Byung-Jick ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 1~8
DOI : 10.7842/kigas.2012.16.2.1
According to the last 5 year statistics of KGS, there occurred 22 under ground gas pipe accidents per year in Korea. And about 5 accidents per year were caused from the third party digging. IT recognition technique could reduce such underground gas accidents. Among IT recognition technique, RFID is most poplar. In the air, RFID were applied to various fields including the distribution industry, but underground condition, the research and application cases of RFID were little This research was undertaken to see the applicability of RFID to underground gas pipe safety. By use of 900 MHz RFID reader and commercial metal tag, the stable recognition distance was measured in the similar underground condition of LNG pipe. Stable recognition depth of RFID tag were measured to be 50, 45, 25 cm in the medium of soil, 5 cm-thick-concrete+soil, and water respectively. The measured distances were considered to be the meaningful distance to prevent the gas pipe accidents Also the efficient ways to input the required gas pipe data to the 24 byte metal tag were proposed. Application of RFID to underground LNG supply system will not only reduce the gas accidents due to third party digging but also improve the gas line maintenance efficiency.
An Analysis on the Temperature Safety of a Boiler Desuperheater
Ha, Ji-Soo ; Kim, Tae-Kwon ; Chang, Hyuk-Sang ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 9~13
DOI : 10.7842/kigas.2012.16.2.9
The present study has been carried out to diagnose the temperature safety of a boiler desuperheater which decreases abnormally higher temperature of superheated steam in a reheater of a power plant. The liquid water in the desuperheater stays in a closed space. It becomes heated by the high temperature superheated steam and boiling could occur. Boiling might increase internal pressure and it could destroy the desuperheater if the internal pressure exceeds the allowable pressure of the desuperheater. The present study modeled reasonably the desuperheater and four cases of heat transfer analysis are executed with the consideration of insulator and natural convective fluid flow of the inside cooling water. For the case excluded the natural convective fluid flow, the temperature exceeds the allowable temperature and pressure. On the other hand, for the real case included natural convective fluid flow and insulator, the active heat transfer from higher temperature region to lower temperature region occurs and it makes the temperature in the cooling water below the allowable temperature and pressure. From this fact, it could be thought that the desuperheater in the reheater is safe from destroy or back flow.
A Study on the Stress and Deformation Behavior of an Alarm Valve using Finite Element Method
Kim, Chung-Kyun ; Kim, Tae-Hwan ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 14~17
DOI : 10.7842/kigas.2012.16.2.14
The stress and deformation behavior of an alarm valve has been analyzed using a finite element method. The strength safety of an alarm valve is calculated for the given maximum test pressure of 2.0MPa. The FEM computed maximum stress of an alarm valve is only 6.1% of yield strength, 370MPa and 4.6% of tensile strength, 485MPa, which are occurred at the corner part between a cover flange and a valve body. And the maximum deformation of
was developed at the middle part of an alarm valve. These results mean that a typical alarm valve was designed with a excessively high strength safety, which may lead to an increase of a weight and a dimension.
Effect of Acoustic Emission During a Fatigue Test with Defect for Type II Gas Cylinder
Jee, Hyun-Sup ; Lee, Jong-O ; Ju, No-Hoe ; So, Cheal-Ho ; Lee, Jong-Kyu ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 18~24
DOI : 10.7842/kigas.2012.16.2.18
This research seeks to evaluate damage on type II gas cylinder by an acoustic emission test when executing 20000 cycles fatigue test and thereafter burst test. Used gas cylinders in the experimental are three types as follows; one is sound cylinder, others are cylinders which contain longitudinal and transverse artificial defect. The size of artificial defect is a depth of 3 mm, width of 3 mm and length of 50 mm. In the case of the cylinder which artificial defect, unlike the expectation that it will burst in low pressure, the burst pressure of the cylinder did not differ much according to whether or not there were defects. However, when there was longitudinal defect, the location of burst was near the location of defect. This leads to the effect in which the thickness of the composite material becomes thinner according to the length of the longitudinal defect and this is judged to have an effect on the location of initiation and growth of crack in the liner. Also, for the acoustic emission signal, when there is longitudinal defect, the ratio of an event occurring at defect position among overall hits is more than 50 %, and the source location also accords very precisely with defect position.
Strength Safety Study on the Stress Characteristics of a Composite Pressure Cylinder for 35MPa Hydrogen Gas Vehicle
Kim, Chung-Kyun ; Kim, Do-Hyun ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 25~30
DOI : 10.7842/kigas.2012.16.2.25
This paper presents a stress safety of a composite pressure cylinder in which is composed of an aluminum liner and composite layers with carbon fiber/epoxy and glass fiber/epoxy resigns. The composite pressure cylinder for a hydrogen gas vehicle contains 9.2 liter hydrogen gas, and hydrogen gases are compressed by a filling pressure of 35MPa. The FEM computed results are analyzed based on the US DOT-CFFC basic requirement for a hydrogen gas cylinder and KS B ISO specification. The FEM results indicate that the stress, 247MPa of an aluminum liner is sufficiently low compared with that of 272MPa, which is 95% level of a yield stress for aluminum. And, the carbon fiber composite layers in which are wound on the surface of an aluminum cylinder are safe because the maximum carbon fiber stresses from 29.43% to 28.87% in hoop and helical directions are below 30% for a given minimum required burst pressure level, respectively. The carbon fiber composite layers are also safe because the stress ratios from 3.40 to 3.46 in hoop and helical directions are above 2.4 for a minimum safety level, respectively.
A Study on Characteristic Analysis for Indoor Ventilation Performance of Mechanical Ventilation System
Ku, Jae-Hyun ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 31~37
DOI : 10.7842/kigas.2012.16.2.31
This paper describes to analyze the ventilation performance of a room air conditioner for indoor comfort control. An experimental apparatus consists of a test room, the room air conditioner, a tracer gas measurement system, a supply fan and a controller. Ventilation performance as a function of human occupancy is evaluated with supply ventilation air using a tracer gas technique of CO2 gas in the test room. The ventilation performance is evaluated in a step-down method based on ASTM Standard E741-83 and is found to increase with increasing supply ventilation rate. The CO2 gas concentration is decayed rapidly without human occupancy. The ventilation performance without human occupancy increases up to 55% and the ventilation performance with one person increases up to 25% at the supply air of 570 lpm comparing with a natural reduction after one hour. A modeling for ventilation performance of a room air conditioner in a test room is presented using experimental datum.
A Study on Performance Improvement in Durability and Reliability of LPi Injector
Park, Cheol-Woong ; Kim, Chang-Up ; Choi, Kyo-Nnam ; Baik, Seung-Kook ; Shin, Moon-Sung ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 38~44
DOI : 10.7842/kigas.2012.16.2.38
In recent years, the need for more fuel-efficient and lower-emission vehicles has driven the technical development of alternative fuels such as LPi (Liquid phase LPG injection) which uses pump for the high pressure supply of liquid LPG fuel and is able to meet the limits of better emission levels while it has an advantage of higher power. Although it has the advantage of power and lower emission levels, the characteristics of LPG, such as high vapor pressure, lower viscosity and surface tension than gasoline fuels makes it difficult design system. Therefore most fuel pumps and injectors are imported. In the present study, in order to domestically develop LPG injector which guarantees flow rates and optimal operation, the experimental investigation on leakage and flow rate characteristics of developed prototype injector was carried out at the bench test rig for developed injector.
Prediction of Minimum Spontaneous Ignition Temperature(MSIT) of the Mixture of n-Pentanol and Ethylbenzene
Ha, Dong-Myeong ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 45~51
DOI : 10.7842/kigas.2012.16.2.45
The MSITs(Minimum Spontaneous Ignition Temperatures) or AITs(Autoignition Temperatures) describe the minimum temperature to which a substance must be heated, without the application of a flame or spark, which will cause that substance to ignite. This study measured the MSITs(Minimum Spontaneous Ignition Temperatures) of n-pentanol+ethylbenzene system by using ASTM E659 apparatus. The MSITs of pure n-pentanol and ethylbenzene were
, respectively. The experimental MSITs of n-pentanol+ethylbenzene system were a in good agreement with the MSIT calculated by the proposed equations with a few A.A.D.(average absolute deviation).
Sprinkler Layout Optimization Based on Fire Simulation and Mathematical Programming including Installation and Damage Costs
Lee, Ki-Jun ; Shin, Young-Sup T. ; Hong, Gi-Hoon ; Joo, Ki-Don ; Shin, Dong-Il ; Kim, Tae-Ok ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 52~59
DOI : 10.7842/kigas.2012.16.2.52
The sprinkler system is regarded as the most effective fire extinguishing system. In this study, we proposed a sprinkler layout optimization framework based on fire simulation and mathematical programming. As a case study, the target space in the form of ordinary residence was set up with the size of
, and we constructed the fire scenario that polyurethane couch was ignited through carelessness. And we simulated and analyzed fire speed, temperature change and heat release rate according to the type and number of sprinklers installed. Through the formulation of installation and damage costs depending on sprinklers, the sprinkler layout showing optimal performance was resulted from mathematical programming.
Actual Condition and Realization of Important on Laboratory Safety Management in Chemical Laboratories
Lee, Keun-Won ; Choi, Yi-Rac ;
Journal of the Korean Institute of Gas, volume 16, issue 2, 2012, Pages 60~66
DOI : 10.7842/kigas.2012.16.2.60
With diversification of research and development activity according to fusion of state-of-the-art technology, potential hazard and risk factors in new forms have been increased in the laboratories. Also, as there are many cases where the experimental condition is extremely high/low temperature and pressure, many many accidents producing loss of life and/or injuries occur due to the extreme condition. In this study, The common fact questionnaire as the survey tool for the establishment of the accident prevention countermeasure in laboratory have been developed to safety security of the laboratory workers. The current status of chemical materials and the realization of important on laboratory safety management using the questionnaire investigated by an electronic mail and visiting survey in the laboratories and universities. The collected data was analyzed with Excel program and it can be utilized as basic data for accident prevention in laboratories.