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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 19, Issue 6 - Dec 2015
Volume 19, Issue 5 - Oct 2015
Volume 19, Issue 4 - Aug 2015
Volume 19, Issue 3 - Jun 2015
Volume 19, Issue 2 - Apr 2015
Volume 19, Issue 1 - Feb 2015
Selecting the target year
Hazards of Chloroprene and the Workplace Management
Kim, Hyeon-Yeong ; Lim, Cheol-Hong ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 1~8
DOI : 10.7842/kigas.2015.19.3.1
In this study, we performed risk assessment of chloroprene by hazard evaluation and workplace investigation. The chemical is used to manufacture of shoes, tires, adhesives, and classified as IARC category 2B (possibly carcinogenic to humans) and target organ systemic toxicity. It is used about 1,300 tons per year in 27 sites. It was calculated the risk of carcinogenesis with chloroprene by Monte-carlo simulation that the averages are 2,199 and 26,404 in each case of working less than 15 minutes per day with local exhaust ventilation and over 4 hours per day without local exhaust ventilation. The risk of target organ systemic toxicity are 4.10 and 169.06 with high correlation with working time to be longer and with ventilation system. Therefore, it is recommended that the local exhaust ventilation and respirators to prevent occupational cancer and target organ systemic toxicity with chloroprene. Especially it is determined that there is a need to strengthen the workplace exposure limit (TWA 10 ppm) in Korea since it is managed with TWA less than 5 ppm (
) by the United States Occupational Safety and Health Administration (OSHA) as well as it has carcinogenicity, reproductive toxicity.
Feasibility Study of Pressure Letdown Energy Recovery from the Natural Gas Pressure Reduction Stations in South Korea
Yoo, Han Bit ; Hong, Seongho ; Kim, Hyo ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 9~17
DOI : 10.7842/kigas.2015.19.3.9
Almost all of the natural gas consumed in South Korea is compressed into very high pressure for the transportation through the underground pipelines, then reduced in pressure regulation stations before delivery to the consumer. For pressure reduction, expansion valves have been used due to the simple and effective installation, but recover none of the energy in the gas during compression. Hence, turbo-expanders are proposed instead of the valves to accomplish the same pressure letdown function and recover some of the compression energy in the form of shaft work converting into electric powers. Here we have theoretically calculated the electric powers at the pressure reduction from 68.7 bar to 23 bar (which are the average values taken at the inlet and outlet points of the expansion valve in medium-pressure regulation stations) according to the inlet conditions of temperature and flow rate. The natural gas is considered as two cases of a pure methane and the mixture of hydrocarbons with a very small amount of nitrogen, and the Peng-Robinson equation of state is employed for the calculation of required thermodynamic properties. The electric energy is recovered as much as 1596 MW(methane) and 1567 MW(mixture) based on the total supply of natural gas in 2013.
Experimental Determination of Closed Cup Flash Point of Binary Flammable Solutions, 2-Propanol+Propionic acid and n-Hexanol+Formic Acid Solutions
Ha, Dong-Myeong ; Lee, Sungjin ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 18~24
DOI : 10.7842/kigas.2015.19.3.18
The flash point is one of the most important indicators of the flammabiliy of liquid solutions. The flash point is the lowest temperature at which there is enough concentration of flammable vapor to form an ignitable mixture with air. In this study the flash points of binary flammable solutions, 2-propanol+propionic acid and n-hexanol+formic acid systems, were measured using Seta flash closed cup tester. Particularly n-hexanol+formic acid system exhibited minimum flash point behavior. The measured values were compared with the calculated values using Raoult's law and optimization method. The calculated data by optimization method described the measured values more effectively than those calculated by Raoult's law.
Ignition Temperature and Residence Time of Suspended Magnesium Particles
Han, Ou-Sup ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 25~31
DOI : 10.7842/kigas.2015.19.3.25
Effects of residence time on the MIT(Minimum Ignition Temperature) in suspended Mg particles are examined by using MIT experimental data and calculation results of terminal velocity. With increasing of the average particle diameter, we were able to identify that MIT of Mg dusts increased and the calculated residence time of particle decreased exponentially. Also, the influence on terminal velocity due to temperature increase increased slightly with increasing of average particle diameter.
Process Design and Analysis of BOG Re-liquefaction System with Pre-liquefaction of NGL
Yun, Sang-Kook ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 32~37
DOI : 10.7842/kigas.2015.19.3.32
The boil-off-gases(BOG) in cryogenic LNG storage tanks are generating continuously due to the heat leakage and need to be re-liquefied by the effective way. As the present method to reliquefy BOG is using LNG cold energy to be supplied after low pressure primary pump, the demand of LNG flow rate should be over 10 times of BOG produced rate to reliquefy it. This research invented new effective re-liquefaction system having only 3~4 times of LNG flow rate against unit BOG, that the pre-liquefaction process of NGL and the use of high pressure LNG cold energy after secondary pump. By the analysis, it could be high efficient reliquefying system for all amount of BOG treatment even during the summer time, and improvement of operation safety and efficiency of LNG terminal.
A Study on the Development of Solid Reference Electrode and Remote Protection Potential Measuring System
Ryou, Young-don ; Kim, Jin-Jun ; Kim, Dong-Kyun ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 38~43
DOI : 10.7842/kigas.2015.19.3.38
For buried gas pipelines, cathodic protection system shall be installed to protect against corrosion. The surveys of pipe-to-soil potentials for the gas pipelines should be carried out at the test box more than once a year. In urban, the test box is usually located on the driveway, therefore, it is difficult to measure the potentials. That is, traffic control is needed when carrying out the measurements of the potentials on daytime, or measurements of pipe-to-soil potentials at the test box located on the driveway have to be carried out in the late night when the traffic is light. We have developed remote potential monitoring system using the solid reference electrode and the wireless communication technology for the purpose of removing above problems. We have installed the developed solid reference electrodes at a site and monitored the potentials by wireless communication. Measured potential values were transferred to the server in office and analyzed. We have found the pipe-to-soil potentials transferred to the web server make no difference to the potentials measured directly on the site.
A Study on the Hydrocarbon Dew Point Prediction by the Compositions of the Fuel Gas Mixtures
Kim, Young-Gu ; Choi, Seul-Gi ; Ahn, Jung-Jin ; Lee, Chang-Eon ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 44~48
DOI : 10.7842/kigas.2015.19.3.44
The equations of hydrocarbon dew points(DT) of the fuel gas mixtures have been derived using the multiple regression analysis. In QSDR(Quantitative Structure Dew-point Relationship), the principal descriptors are CN(average carbon number) and BI(the ratio of the branched isomers). QSDRs studied by changing the pressures of the fuel gas mixtures in the range of 100 kPa ~ 500 kPa are as follows;
(at 100 kPa,
(at 200 kPa,
(at 300 kPa,
(at 500 kPa,
) (4) As the average carbon numbers in the mixed fuel being reduced or the ratio of the branched isomers having a boiling point lower increase, The hydrocarbon dew point becomes lower, The differences between the hydrocarbon-dew points determined by the multiple regression and those calculated by the commercial program, VMGSim are negligible.
Study for Examples of Fire Including Friction with Automotive Clutch, Manual Transmission and Tire System
Lee, Il Kwon ; Moon, Hak Hoon ; Kim, Jin Jun ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 49~53
DOI : 10.7842/kigas.2015.19.3.49
The purpose of this paper is to study and analyze the failure examples for fire by friction on clutch, manual transmission and tire system in a car. In the first example, the driver took the pedal with foot to act the clutch. But the clutch disk did not return from flywheel by leakage of clutch hydraulic line. The heat was produced between clutch disk and flywheel by surface contacting. As a result, it was produced the fire by oil sludge sticked with transmission. In the second example, the transmission system was operated to transfer power of engine by contacting with gear and gear. But, as if the oil of transmission was caused the oil insufficiency because of leaking by crack of transmission case, it found the fact that was produced the fire by deposit material on transmission case. In the third example, when the car's driver continuously pushed an accelerator pedal for escaping from dry pit, the tire took the heat by the friction force between tire and surface of road. As a result, it became the direct cause for the fire. Therefore the driver must manage not to produce the fire with friction parts by heating during running.
The Analysis of Dissociation Properties According to Gas Hydrate Saturation and Depressurization Rate
An, Seung-Hee ; Chon, Bo-Hyun ;
Journal of the Korean Institute of Gas, volume 19, issue 3, 2015, Pages 54~59
DOI : 10.7842/kigas.2015.19.3.54
The gas hydrate of 10 trillion tons are buried under continental slope in the world(permafrost : 2%, marine continental slope: 98%), but technology for the the commercial gas recovery has not developed yet. There are normally four representative recovery methods: depressurization method, thermal stimulation method, inhibition injection method, and displacement method. This study focuses on change of dissociation time and gas production according to gas hydrate saturation rate and depressurization rate. It was found that the correlation between depressrization rate and dissociation time was like as
. It was also found that the bigger depressurization rate is, the better production is(methane gas is produced over 46.2% at depressurization rate 50% compared with 40%). However, on the contrary to this, it is presumed that gas production is decreased at 60% due to gas hydrate reformation.