• Title/Summary/Keyword: fire.explosion

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The Measurement and Investigation of Fire and Explosion Properties for Cyclohexane (사이클로헥산의 화재 및 폭발 특성치의 측정 및 고찰)

  • Ha, Dong-Myeong
    • Journal of the Korean Institute of Gas
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    • v.15 no.2
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    • pp.75-81
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    • 2011
  • For the safe handling of cyclohexane, the explosion limit at $25^{\circ}C$ and the temperature dependence of the explosion limits were investigated. Flash point and AIT(autoignition temperature) for cyclohexane were experimented. By using the literatures data, the lower and upper explosion limits of cyclohexane recommended 1.0 Vol% and 9.0 Vol%, respectively. Moreover lower flash points of cyclohexane recommended $-20^{\circ}C$. It was measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for cyclohexane, and the experimental AIT was $255^{\circ}C$. The new equations for predicting the temperature dependence of the explosion limits of cyclohexane is proposed. The values calculated by the proposed equations were a good agreement with the literature data.

Expected Damage Analysis of Risk Exposure Object by Violation Rate of Safety Distance in Explosion of Ground Type Magazine (지상형 탄약고 폭발 시 안전거리 위반율에 따른 위험노출대상의 피해 수준 분석 연구)

  • Ham, Tae Yuun;Lee, Jae Joon
    • Journal of the Korean Society of Safety
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    • v.37 no.4
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    • pp.92-100
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    • 2022
  • Of the Korean military's 3,959 ammunition depots, 1,007 - more than 25% - violate safety requirements for distance and equipment. There is a risk of explosion in old depots that are vulnerable to various interior and exterior accidents. This paper examines 10 scenarios, with varying values for ammunition amount and safety distance. The study calculated the overpressure that can be applied to risk-exposure objects, based on the safety distance; expected damage was predicted using constructed spatial information from 3D explosion simulations. The simulations confirmed that explosion overpressure increased the most when the safety distance violation rate increased from 80% to 90%. It also confirmed that secondary damage such as fire and explosion can cause casualties and property damage when the violation rate is 60% or higher. The results show that building collapse becomes a risk with a violation rate of 70% or higher. We conclude that taking ammunition depot safety distance violation into account when planning military facilities and their land utilization could better protect life and property.

Experimental Study on Gas Explosion According to the Effect of Confinement and Congestion Levels (밀폐도 및 밀집도의 영향에 따른 가스폭발 실험 연구)

  • Boohyoung Bang
    • Journal of the Korean Institute of Gas
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    • v.27 no.4
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    • pp.56-61
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    • 2023
  • The plant is an important facility as a infrastructure, and ensuring safety against possible accidents such as gas leaks and explosions must be considered in the design. However, there is little study on explosion pressure in plants for reasons such as economic feasibility, and overpressure data on this field is insufficient. In this study, an experimental design plan considering the explosion scenario that may occur in the plant was presented, and the explosion pressure was confirmed through an explosion experiment. Hydrogen-methane mixed gas was used as a combustible material, and the effect of confinement and congestion on overpressure was studied. The effect of overlapping pressure waves during deflagration and the turbulence effect by congested pipes are discussed. The results of this study can be used as input data in various safety designs.

Risk Assessment by Means of Measurement of Combustible Characteristics for n-Nonanol (노말노난올의 연소특성치 측정에 의한 위험성 평가)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.26 no.2
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    • pp.84-89
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    • 2012
  • For the safe handling of n-nonanol, this study was investigated the explosion limits of n-nonanol in the reference data. The flash points and AITs (autoignition temperatures) by ignition delay time were experimented. As a results, the lower and upper explosion limits of n-nonanol recommended 0.8 Vol.% and 6.1 Vol.%, respectively. The lower flash points of n-nonanol by using closed-cup tester were experimented $94{\sim}97^{\circ}C$. The lower flash points of n-nonanol by using open cup tester were experimented $103{\sim}104^{\circ}C$. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-nonanol. The experimental AIT of n-nonanol was $270^{\circ}C$.

Appropriateness of MSDS by Means of the Measurement of Combustible Properties of Anisole (아니솔의 연소특성치의 측정에 의한 MSDS의 적정성)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.29 no.2
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    • pp.20-24
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    • 2015
  • For the safe handling of anisole, this study was investigated the explosion limits of anisole in the reference data. The flash points and auto-ignition temperatures (AITs) by ignition delay time were experimented. The lower flash points of Anisole by using closed-cup tester were experimented in $39^{\circ}C$ and $42^{\circ}C$. The lower flash points of Anisole by using open cup tester were experimented in $50^{\circ}C$ and $54^{\circ}C$. This study measured relationship between the AITs and the ignition delay times by using ASTM E659 tester for Anisole. The AIT of Anisole was experimented as $390^{\circ}C$. The lower explosion limit (LEL) by the measured the lower flash point for Anisole were calculated as 1.07 Vol%.

The Investigation of Combustible Hazard by Measurement of Flash Point and Autoignition Temperature of n-Dodecane (노말도데칸의 인화점과 최소발화온도 측정에 의한 연소위험성 고찰)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.25 no.2
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    • pp.120-125
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    • 2011
  • For the safe handling of n-dodecane, the explosion limits were investigated and the lower flash points and AITs (autoignition temperatures) by ignition delay time were experimented. By using the literatures data, the lower and upper explosion limits of n-dodecanee recommended 0.6 Vol.% and 4.7 Vol.%, respectively. The lower flash points of n-dodecane by using closed-cup tester were experimented $77^{\circ}$ and $80^{\circ}C$. The lower flash points of n-dodecane by using open cup tester were experimented $84^{\circ}C$ and $87^{\circ}C$. This study measured relationship between the AITs and the ignition delay times by using ASTM E659-78 apparatus for n-dodecane. The experimental AIT of n-dodecane was $222^{\circ}C$.

The Measurement of the Combustible Properties of tert-Butylbenzene for the Improvement of MSDS (Material Safety Data Sheet) (MSDS 개선을 위한 tert-Butylbenzene의 연소특성치의 측정)

  • Ha, Dong-Myeong
    • Fire Science and Engineering
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    • v.31 no.3
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    • pp.25-30
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    • 2017
  • Because of the vertical combustion characteristics of combustible substances, accurate substance safety information for their safe use, handling and transportation is essential. The flash point, fire point, explosion limits and autoignition temperature (AIT) are important safety parameters which need special attention in chemical plants and laboratories that handle dangerous materials. In this study, tert-butylbenzene which is widely used as an intermediate material in the chemical industry was selected. For the reliability of the flammable properties of tert-butylbenzene, this study was investigated the explosion limits of tert-butylbenzene in the reference data. The flash points, fire points and AITs by the ignition delay time for tert-butylbenzene were experimented. The lower flash points of tert-butylbenzene by using the Setaflash and Pensky-Martens closed-cup testers measured $39^{\circ}C$ and $44^{\circ}C$, respectively. The flash points of tert-butylbenzene by using the Tag and Cleveland open cup testers are measured $51^{\circ}C$ and $54^{\circ}C$. And the fire points of tert-butylbenzene by the Tag and Cleveland open cup testers were $54^{\circ}C$ and $58^{\circ}C$ respectively. The AIT of tert-butylbenzene measured by the ASTM 659E tester was measured as $450^{\circ}C$. The lower explosion limit of $39^{\circ}C$ which measured by the Setaflash flash point tester was calculated to be 0.68 vol%.

The Quenching Ability of Flame Arrester (화염방지기의 소염성능)

  • Ryu, Eun-Ryeol
    • Fire Protection Technology
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    • s.11
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    • pp.23-30
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    • 1991
  • For the prevent of fire accident or explosion disasters from inflammable gas and vapour, flame arresters are used in chemical equipment, oil tank or other similar installation. The flame arresters have been used mainly wire gauze type. Wire gauze type flame arrestes is affected several factors. We have know that the quenching ability has a great of difference the preference in accordance with flame velocity, direction of flame propagation and wire net of mesh and number of qauze and introduce examination result data quoated from the abroad.

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Cause of Explosion of the Indoor Shooting Range Fire in Busan and Safety Measures (부산 실내사격장 화재의 폭발원인과 안전대책)

  • Park, Woe-Chul
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2010.04a
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    • pp.68-72
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    • 2010
  • 부산 실내사격장 화재의 사격실 내 폭발의 원인을 추정하고 안전대책을 강구하기 위해 화재 시뮬레이션과 외국 실내사격장 화재의 사례조사를 수행하였다. 사격실 내의 폭발원인은 다공성 계란판형 폴리우레탄 흡음재와 흡음재에 축적된 잔류화약 분말의 격렬한 연소로 추정되었다. 실내사격장의 안전대책으로 폴리우레탄 흡음재의 사용금지, 잔류화약의 제거와 철저한 관리, 금연, 탄자받이 주위의 강재 요소 제거, 효율적 환기 등이 요구된다.

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