• Title/Summary/Keyword: Extinguishing Agent

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Discharge and Fire Extinguishing Test of Inert Gas Clean Agent (불활성 가스계 청정 소화약제의 방출 및 소화)

  • Song Eun-Seok;Kim Jae-Duck;Park Yang-Won
    • Fire Science and Engineering
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    • v.19 no.2 s.58
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    • pp.29-36
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    • 2005
  • We carried out discharge and fire extinguishing tests of new inert gas clean agent, which consists of $92\%$ nitrogen and $8\%$ carbon dioxide, as an alternative of Halon that is banned by Montreal Protocol to protect the ozone layer of the earth. Discharge and fire extinguishing tests were performed in $27m^3$ and $190m^3$ rooms with piping which allows gaseous agent to transport from storage to test rooms. We confirmed that it took less than regulation time, 60 seconds for the discharge of over $95\%$ initial charged amounts. Discharge test variables were piping length and orifice size. Fire extinguishing tests verified that this new inert gas clean agent is suitable for both n-Heptane fire and deep seated fire of wood crib.

A Study on the Fire Extinguishing Ability Rating of Load Streams (강화액 소화성능평가에 관한 연구)

  • Kwon, Seong-Pil;Kim, Hyeong-Gweon;Yoon, Hun-Ju;SaKong, Seong-Ho
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.04a
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    • pp.159-162
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    • 2008
  • A standard fire extinguishing tester, with which we could conduct the fire extinguishing ability rating of a water-based fire extinguishing agent such as water and loaded stream, has been developed in this work. It could help us enhancing the efficiency and reliability of the fire extinguishing test of loaded streams, and at last increasing the productivity of fire protection related firms. Furthermore, our country could take the lead in making a new standard for the fire extinguishing test of loaded streams. As a result, it is expected that loaded streams could be improved by using it. In addition the standard fire extinguishing tester could be made moderately in our industry, and supplied at home and worldwide.

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A Consideration on Improvement of Safe Lithium Battery Air Transportation (리튬 전지의 안전한 항공 운송을 위한 개선 방향 고찰)

  • Joe, Hunmyung
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.25 no.3
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    • pp.135-142
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    • 2017
  • As PED(Personal Electronic Device) market has been rapidly grown, the demand on Lithium battery, which is most commonly used power source of PED, also has been increased. Dew to this trend, the amount of Lithium battery air transportation is also increasing. However, it should be treated very carefully because Lithium is one of very explosive metal. So ICAO, IATA and civil aviation agencies try to enhance the safety of Lithium battery air transportation by aircraft certification and operating regulations. To enhance in-flight safety, the aircraft for transporting Lithium battery should equip certified fire extinguishing system. But recent studies find that Halon, currently used extinguishing agent, is not effective on extinguishing Lithium battery fire. Besides, there is no certified Halon replacement for air use and no acceptable specific minimum performance standard(MPS) for Lithium battery fire. For this issue, a study on characteristics and establishing MPS of Lithium battery fire is needed for safe air transportation of Lithium battery.

A Study on the Flame Extinguishing Characteristics of Inerting Gaseous Agents (불활성가스계 소화약제의 불꽃소화 특성에 관한 연구)

  • Kim, Sung-Min;Shin, Chang-Sub;Park, Jae-Man
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2008.04a
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    • pp.148-150
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    • 2008
  • Halon gas agent has been widely used as the extinguishing agent for B class and C class fires because of its excellent extinguishing power. But Halon was found to contribute to the ozone layer destruction, eventually Halon designated as one of ozone-layer-destroying materials in the Montreal Protocol in 1987, In this study, in the context of such researches, we measured the characteristics of flame concentrations of inert gaseous agents by Cup-burner method.

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The Verify of Environmental Toxicity of Foam Extinguishing Agents by Fish-Acute Toxicity Test (포소화약제의 어류급성독성 시험을 통한 환경독성 검증)

  • Lee, Jungyun;Kang, YoungJin;Kim, Hong
    • Journal of the Korean Society of Safety
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    • v.30 no.4
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    • pp.51-55
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    • 2015
  • There are various studies on the fire suppression process but the study on second pollution from fire products is not enough yet. Therefor, in this study verify that environmentally-friendly properties($LC_{50}$) of foam extinguishing agent with increases its amount used through with Fish-Acute Toxicity Test using a fish named Misgurnus anguillicaudatus that is appointed by OECD Test Guideline. In conclusion, proven that environmentally friendly properties of the agent of hoseo university through 16 times of LC50 than that of market.

A Study of Fire Extinguishment Characteristic for the Real Scale Deap-Seated Fire (실규모 심부화재 소화특성에 관한 연구)

  • Kim, Nam-Kyun;Rie, Dong-Ho
    • Fire Science and Engineering
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    • v.29 no.2
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    • pp.13-19
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    • 2015
  • Real scale fire tests was carried out for extinguishing performance evaluation of the wetting agent. The experiment was conducted in accordance with a Class A fire extinguishing test methods specified in the 'Type Approval of the Manual System Fire Extinguisher and Technical Standards of Test'. In addition, the subjects of this experiment were the wood flour and rice husk. Fire-fighting water, the three kinds of wetting agents used in the country and this study was used, was undertaken to determine a clear discrimination of the water and wetting agent. In the experimental results, it was confirmed that the internal temperature is maintained long time in the case of water. The internal temperature were rapidly lowered in the experiment of wetting agents. Therefore, the discrimination of extinguishing ability was confirmed by the temperature distribution in accordance with time. Based on the results of this experiment, this study is expected to be used as a underlying material on presenting a method of optimized performance evaluation of wetting extinguishing agent.

An Experimental Study on the Improvement of Fire Extinguishing Performance of Water Mist with Foam (포 소화약제를 혼합한 미분무수 소화시스템의 소화성능 향상 방안에 관한 실험적 연구)

  • Hwang, Won-Jun;Kim, Hwang-Jin;Oh, Kyu-Hyung;Lee, Sung-Eun;Kim, Sung-Won
    • Fire Science and Engineering
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    • v.23 no.3
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    • pp.61-66
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    • 2009
  • We carried out the water mist fire extinguishing experiments with the 3 kinds of foaming agents varied on the nozzle height. Test result showed that 2% AFFF (Aqueous Film Forming Foam) and 1% synthetic foaming agent for water mist system are the faster extinguishing time than the pure water mist and 3% AFFF solution. Additionally, the best fire extinguishing performance of pure water mist was shown at 3.5m nozzle height and that of the foaming agents shown at 4m nozzle height.

[Retracted]Improving Performance of Foam Proportioner Utilizing Metering Venturi Type ([논문철회]미터링 벤츄리를 이용한 포소화약제 혼합장치의 성능개선)

  • Joo, Seung-Ho;Kong, Ha-Sung;Gong, Ye-Som
    • Fire Science and Engineering
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    • v.29 no.3
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    • pp.48-52
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    • 2015
  • In this study, we have evaluated whether the mixing ratio is proper by creating a mixing device for foam proportioner that mainly is employed in practice utilizing a metering venturi type. In case of the mixing ratio for 3%, water under pressure of 76 mm in diameter and the original liquid of a foam fire extinguishing agent of 31.75 mm in diameter have showed up the fluctuation rate just as much as 3.1~3.5% of the mixing ratio. Because water under pressure of 101.6 mm in diameter and the original liquid of a foam fire extinguishing agent of 38.1 mm in diameter have showed up 3.3~3.7% of the fluctuation rate, water under pressure of 101.6 mm in diameter and the original liquid of a foam fire extinguishing agent of 38.1 mm in diameter have satisfied 3.0~3.9% of performance criterion. And also, in case of the 6% of mixture rate, water under pressure of 76.2 mm in diameter and the original liquid of a foam fire extinguishing agent of 31.75 mm in diameter have showed up the fluctuation rate just as much as 6.4~6.8% of the mixing ratio. Because water under pressure of 101.6 mm in diameter and the original liquid of a foam fire extinguishing agent of 38.1 mm in diameter have showed up 6.0~6.8% of the fluctuation rate, water under pressure of 101.6 mm in diameter and the original liquid of a foam fire extinguishing agent of 38.1 mm in diameter have satisfied 6.0~7.0% of performance criterion.

Influence of the Nozzle Contraction Angles of Gaseous Extinguishing Systems on Discharge Noise (가스계 소화시스템 노즐 수축각이 방출소음에 미치는 영향)

  • Kim, Yo-Hwan;Yoo, Han-Sol;Hwang, In-Ju;Kim, Youn-Jea
    • Fire Science and Engineering
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    • v.33 no.4
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    • pp.77-82
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    • 2019
  • Fire extinguishing systems are essential equipment in all indoor facilities to address unexpected fire scenarios, and appropriate fire extinguishing agent should be used depending on the place and object to protect. Among these, gaseous fire-extinguishing systems are used to protect electronic equipment. Therefore, inert gases that do not undergo chemical reactions are used mainly in those systems. On the other hand, recently, owing to the high integration of electronic equipment, there are some cases, in which large noise generated from gaseous systems damage the electronic equipment. In this study, numerical analysis of the discharge noise with various nozzle contraction angles was carried out to improve the gas fire extinguishing system. Numerical analysis was carried out using ANSYS FLUENT ver 18.1. The causes of the noise were elucidated using the swirl distribution. The noise level of the modified model was reduced by approximately 6 dB compared to the reference model, which is similar to the result of a previous study, confirming the validity of the method.