• Title/Summary/Keyword: explosion gas

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A Study on The Explosion Characteristics of Flammable Gases (가연성 가스의 폭발특성에 대한 연구)

  • 오규형;김한석;이춘하
    • Journal of the Korean Society of Safety
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    • v.7 no.3
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    • pp.66-72
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    • 1992
  • An experimental study was carried out to analyse the explosion characteristics of flammable gas-air mixtures. Used flammable gases were hydrogen, methane, acethylene, ethylene and pro-pane, explosion Pressure, explosoin pressure rising rate, and flame propagation velocity were measured experimentaly. The maximum explosion pressure and rising rate of flammmalbe gas air mixtures were appeared at the range of slightly higher concentration than the stoichiometric concentration. Initial pressure before explosion was controlled from 0.6 to 2.0kg/cm absolutly. Explosion pressure was increased with increment of the initial pressure, and the relationship between initial pressure and explosion pressure was Pe = KPi. The effect of vessel size on explosion characteristics was also analysed In this experiment. Explosion pressure was increased with in-creasing the vessel size, otherwise explosion pressure rising rate was decreased. When we locate a dummy material in vessel explosion pressure was decreased with increasing the dummy volume but exlosion pressure rising rate was increased.

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Underwater Explosion Experiments using Pentolite (펜톨라이트를 이용한 수중폭발 실험)

  • Choi, Gulgi;Jung, Keunwan;Jung, Son Soo;Kim, Jong-Chul;Lee, Phill-Seung
    • Explosives and Blasting
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    • v.35 no.3
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    • pp.21-30
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    • 2017
  • When explosives explode in water, the effect of post-explosion gas after explosion should be considered, unlike explosion in the air. During explosion in water, the propagation velocity of the explosion pressure is faster than when the explosion occurs in the air. The generated gas is diffused and trapped in the form of bubbles by water before the energy is dissipated. At this time, the bubble expands and contracts, creating a shock wave. In order to investigate this series of phenomena, a cylinder type steel water tank capable of observing the interior was fabricated and explosion experiments were conducted. In this study, a small amount of shell-free pentolite was exploded in water. Experiments were performed to observe the behavior of the generated gas bubble as well as to measure the shock wave generated. We designed the experimental method of underwater explosion and examined the results.

A Study on Estimation of Structure Damage caused by VCE (VCE에 의한 건물피해예측에 관한 연구)

  • Leem, Sa-Hwan;Lee, Jong-Rark;Huh, Yong-Jeong
    • Journal of the Korean Society of Safety
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    • v.22 no.5
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    • pp.65-70
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    • 2007
  • This paper is estimation of structure damage caused by VCE(Vapor Cloud Explosion) in enclosure. As we estimate the influence of damage which occur at gas facility in factory. We can utilize the elementary data of safety distance. In this study, the influence of over-pressure caused by VCE in enclosure was calculated by using the Hopkinson's scaling law and the accident damage was estimated by applying the influence on the adjacent structure into the probit model. As a result of the damage estimation conducted by using the probit model, both the damage possibility of explosion overpressure to structures of 20 meters away and to glass bursting of 80 meters away was nearly zero in open space explosion.

Discussions on the Cause of Mixed Gas Cylinder Rupture (혼합가스용기폭발 원인에 대한 고찰)

  • Yoon, Jae-Kun
    • Journal of the Korean Institute of Gas
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    • v.15 no.6
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    • pp.51-56
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    • 2011
  • Mixed gas cylinder(80% Ar, 20% $O_2$) exploded three years ago. But the cause of cylinder rupture was not identified and the case was finished. This paper is the discussions on the cause of cylinder explosion with the investigation report by the police and the similar accident cases. The cause of explosion is the chemical reaction in the cylinder. This accident is similar with the explosion of pressurized oxygen cylinder.

Hazard Assesment of Dust Explosion Pharmaceutical Raw Material Powders (원료의약품 분진의 폭발 위험성 평가)

  • Kim, Won Sung;Lee, Keun Won;Woo, In Sung;Jeon, Sang Yong
    • Journal of the Korean Society of Safety
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    • v.33 no.2
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    • pp.39-44
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    • 2018
  • Dust explosions are occurring in a variety of industries. A dust explosion caused by a specific energy generates huge amount of energy in the ignition and releases decomposition gas. Damages can be increased since this released decomposition gas can cause second and subsequent explosions. In this study, the goal was to obtain practical information on what could affect the explosion by comparing the characteristics of two kinds of dusts with completely different chemical properties. Three kinds of dusts were measured and evaluated for explosion pressure, dust explosion index, explosion limit and minimum ignition energy. It is possible to grasp the characteristics of each dust and use it as useful accident prevention data in the production of raw material powder.

A Study on the Explosion Characteristics of Hydrogen (수소의 폭발 특성에 관한 연구)

  • Oh, Kyu-hyung;Rhie, Kwang-won
    • Journal of Hydrogen and New Energy
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    • v.15 no.3
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    • pp.228-234
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    • 2004
  • It was discussed about explosion danger of hydrogen gas experimentally that could be happen during the handling and using. Hydrogen concentration was varied from 10 to 60 vol% for get the explosion characteristics of hydrogen and 5 kinds of cylindrical vessel were used to find the explosion characteristics of hydrogen according to the vessel volume. Initial pressure of hydrogen-air mixture was varied from 0.6 to 2 kg/cm2. Based on the experiment, explosion pressure was most high near the 30vol% of hydrogen and explosion pressure was increased slightly according to the increase of vessel volume but explosion pressure rise rate was decreased. Explosion pressure was increased linearly proportional to the initial pressure of gas mixture.

The Explosion Characteristics of City Gas on the Change of Oxygen Concentration and Pressure (산소농도와 압력 변화에 따른 도시가스의 폭발특성)

  • Choi Jae-Wook;Lee In-Sik;Park Sung-tae
    • Journal of the Korean Institute of Gas
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    • v.9 no.1 s.26
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    • pp.38-43
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    • 2005
  • To examine the characteristics of the explosion of city gas, the concentration of oxygen was changed with the change of initial pressure. From the result of the experiment, as the concentration of oxygen was low, the explosion limit became narrow and the minimum concentration of oxygen for the explosion was $12\%$. Furthermore, As the increase of the initial pressure, explosion ranges were a little increased. And as the change of the initial pressure, the maximum explosion pressure were $6.3 kgf/cm^2{\cdot}g,\;12.7 kgf/cm^2{\cdot}g$ and the maximum pressure rising velocity were $245.63 kgf/cm^2/s,\;427.88 kgf/cm^2/s$.

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Analysis of Explosion Energy related to the Cause of Tianjin Explosion Accident in China (중국 텐진항 폭발사고 원인과 관련된 폭발 에너지 분석)

  • Kwon, Sangki;Kim, Ha Yung
    • Explosives and Blasting
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    • v.34 no.1
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    • pp.1-10
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    • 2016
  • On August 12, 2015, two huge explosions were accidently happened in Tianjin port, China. The explosion energies of the two explosions were similar to those of TNT 3 tons and TNT 21 tons. Until now, the cause of the explosions was not clearly announced but some guesses of the cause were released. One of the possible cause of the explosion is the generation of explosive acetylene gas from the chemical reaction between $CaC_2$ and spraying water to extinguish fire happened at the storage site of different chemical compounds. The explosion of acetylene gas might ignite the explosion of 800 tons of ammonium nitrate. In this study, the explosion due to the scenario was analyzed in order to check that such a chemical reaction can produce the huge explosion observed at the Tianjin accident.

A Forensic Engineering Study on Evaluation of Explosive Pressure and Velocity for LNG Explosion Accident using AUTODYN (AUTODYN을 이용한 LNG 폭발 사고 위력 평가에 관한 법공학적 연구)

  • Kim, Eui Soo;Kim, Jong Hyuk;Shim, Jong Heon;Kim, Jin Pyo;Goh, Jae Mo;Park, Nam Kyu
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.56-63
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    • 2015
  • Gas explosion accidents could cause a catastrophe. we need specialized and systematic accident investigation techniques to shed light on the cause and prevent similar accidents. In this study, we had performed LNG explosion simulation using AUTODYN which is the commercial explosion program and predicted the damage characteristics of the structures by LNG explosive power. In the first step, we could get LNG's physical and chemical explosion properties by calculation using TNT equivalency method. And then, by applying TNT equivalency value about the explosion limit concentration of LNG on the 2D-AUTODYN simulation, we could get the explosion pressure wave profiles (explosion pressure, explosion velocity, etc.). In the last step, we performed LNG explosion simulation by applying to the explosion pressure wave profiles as the input data on the 3D-AUTODYN simulation. As a result, we had performed analyzing of the explosion characteristics of LNG in accordance with concentration through the 3D-AUTODYN simulation in terms of the explosion pressure behavior and structure's destruction and damage behavior.

A Study on the Improvement of Classification of Explosion Hazardous Area using Hypothetic Volume through Release Characteristic (누출특성을 통한 폭발위험장소 선정방법의 개선에 대한 연구)

  • Kim, Dae-Yeon;Chon, Young-Woo;Lee, Ik-Mo;Hwang, Yong-Woo
    • Journal of the Korea Safety Management & Science
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    • v.19 no.2
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    • pp.31-39
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    • 2017
  • Classify of explosion hazardous areas must be made at the site where flammable materials are used. This reason is that it is necessary to manage ignition sources in of explosion hazardous areas in order to reduce the risk of explosion. If such an explosion hazard area is widened, it becomes difficult to increase the number of ignition sources to be managed. The method using the virtual volume currently used is much wider than the result using CFD(Computational Fluid Dynamics). Therefore, we tried to improve the current method to compare with the new method using leakage characteristics. The result is a realistic explosion hazard if the light gas is calibrated to the mass and the heavy gas is calibrated to the lower explosion limit. However, it is considered that the safety factors should be taken into account in the calculated correction formula because such a problem should be considered as a buffer for safety.