• Title/Summary/Keyword: Extinguishing Test

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Spray Flow Characteristics of Twin-fluid Water Mist Nozzle for Fire Suppression (2유체 미세 물분무 소화노즐의 분무유동 특성)

  • Kim, Bong-Hwan;Choi, Hyo-Sung;Kim, Dong-Keon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.3
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    • pp.60-66
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    • 2011
  • In the present investigation, experimental studies were conducted on the fire suppression performance of twin-fluid water mist spray which is subjected to thermal radiation in a closed space. Downward-directed water-mist sprays, interacting with an under kerosene pool fire, were investigated in a test facility. The mass mean diameter of water-mist droplets were measured by PMAS under various flow conditions. The developed twin-fluid water mit spray nozzle satisfied the criteria of NFPA 750, Class 1. The mechanism of fire suppression by fine water mist was concluded to be the cooling of the fire surface which leads to the suppression of fuel evaporation. It was proved that the automatic twin-fluid water mist spray system under lower pressures could be applied to an industrial facilities.

Overhead Catenary Measurement by High-speed Image Analysis (고속 이미지 분석에 의한 전차선로 계측)

  • Park, Young;Lee, Ki-Won;Cho, Hyeon-Young;Kwon, Sam-Young;Park, Chan-Bae;Park, Hyun-June
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.824-828
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    • 2007
  • With increasing interest in the reduction of cost for operation and maintenance of overhead catenary system, various methods of condition monitoring have been developed and used in with high-speed analysis and advanced image processing techniques. This study utilizes a high-speed camera as inspecting system to measure the wear, stagger, hight and arc extinguishing test of overhead catenary system. All measuring image were captured by a high speed CMOS camera with PCI express output, which can acquire up to 1000 frames per second with the resolution 1024 × 1280 pixels. Line type laser source with a power equal to 300 mW and the National Instrument LabVIEW (8.0) based on vision acquisition software have been used in application programming interface for image acquisition, display, and storage. The proposed high-speed camera system is finally applied to measure the overhead catenary system showing promising on-field applications

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A study on the Fire Extinguishing performance test of Water-Based Fire Protection System on Wooden cultural property (목조문화재에 대한 수계소화설비의 소화성능 실험 연구)

  • Kim, Hyun-Ju;Roh, Sam-Kew;Ham, Eun-Gu;Kim, Dong-Cheol;Kim, Kyung-Sik
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2011.11a
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    • pp.179-182
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    • 2011
  • 본 연구는 목조 건축물의 규모(높이)에 따른 수계 소화설비의 화재 진압 성능을 비교하여 최적의 소화설비를 선택함을 목적으로 한다. 높이 2.5m(소), 4m(중), 5.5m(대)의 모형화재실을 제작하고 모형화재실 천장에 스프링클러헤드와 미분무헤드를 설치, 소화실험을 진행하여 천장부 온도변화 및 소화시간, 방수량을 측정한다.

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Development of DC Circuit Breaker using Magnet Arc Extinguisher (자기적 아크소호 기법을 이용한 직류 차단기 개발)

  • Lee, Sung-Min;Kim, Hyo-Sung
    • The Transactions of the Korean Institute of Power Electronics
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    • v.17 no.1
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    • pp.21-26
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    • 2012
  • In recent years, DC distribution systems are becoming hot issue due to the increase in digital loads and DC generation systems according to the expansion of renewable energy technologies. However, removing the fault current in DC grids is comparably difficult since the current in DC grids has no zero-crossing point like in AC grids. Thus, developing dedicated DC circuit breakers for DC grids is necessary to get safety for people and electrical facilities. This paper proposes magnet arc extinguishing method to develop a 300[$V_{DC}$]/10[A] DC circuit breaker. The performance of the proposed DC circuit breaker was verified by an experimental circuit breaker test system built in this research.

A performance test of an halon fire extinguishing system for a helicopter engine (헬기 엔진실 할론 소화시스템 성능평가)

  • Choi, Byung-Il;Han, Yong-Shik;Do, Kyu-Hyung;Kim, Myung-Bae;Bae, Hak-Sung;Seo, Seok-Joo
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2009.04a
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    • pp.180-187
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    • 2009
  • 한국형 헬기 개발사업 (KHP)에서 개발 중인 한국형 기동 헬기(KUH)의 엔진실에 적용되는 소화시스템의 성능평가를 수행하였다. 사용된 소화약제는 할론 1301 이며, 국방규격에 맞게 설계 되었다. 실물모형의 엔진 목업을 제작하여 소화시스템을 배치하고, 화재 소화실험과 할론 농도 측정 실험을 수행하였다. 실험 결과 설계된 소화시스템은 엔진실 내부의 화재를 효과적으로 소화시켰으며, 국방 규격에서 요구하는 분사 시간 조건 및 농도조건을 만족함을 확인 하였다.

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The Assessment of Fire Suppression Capability of Water-Mist System for Machinery Engine Room (선박기관구역 미분무수 소화설비 화재진압 성능 평가)

  • Choi, Byung-Il;Han, Yon-Shik;Oh, Chang-Bo;Kim, Myung-Bae;Kim, Chang
    • Fire Science and Engineering
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    • v.21 no.2 s.66
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    • pp.111-117
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    • 2007
  • Full scale fire suppression test by water mist system were performed in machinery engine room ($20m{\times}15m{\times}10m$) according to IMO MSC/circ. 1165. The K-factor and operating pressure were 2.4 and 80 bar respectively. To assess the prediction capability of numerical simulation, FDS simulation was performed at the same operating condition with the full scale experiment. It was found that FDS simulation had the limitation for the fire extinguishing time prediction but was able to predict the spatial temperature distribution.

A Study on Ignition and Fire Risks of Electric Heat Wire (전기적 열선의 발화 및 화재 위험성에 관한 연구)

  • Min, Se-hong;Song, Byeong-jun
    • Journal of the Korea Safety Management & Science
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    • v.17 no.4
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    • pp.113-121
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    • 2015
  • This study aims to examine the risk of electrical fire in places where electric heat wires are used. In general, the use of electric heating wires is becoming more common and prevalent in a bid to prevent increasing damage caused by freezing and bursting in residential water pipes, factory pipes and irrigation pipes in vinyl greenhouse and a variety of heat wire products are available in market with legal safety requirements imposed on them. However, the widespread use of anti-freezing burst heat wire products has caused increasing incidents of fire, which often fail to be incorporated into statistics due to quick onsite extinguishing and insignificant damage although damage is gradually on the rise. Against this backdrop, this study aims to look into the possibility of ignition caused by electric heat wires and the mechanism of how it turns into catching fire through overheat and short circuit tests for anti-freezing burst electrical heat wires (hereinafter called the 'heat wire') and expects to serve as the basis for further observations and analyses on the cause of fire and the process of ignition in a scientific manner.

Experimental Study on Moisture Content According to Addition of Surfactants (계면활성제 첨가에 따른 함수율에 관한 실험적 연구)

  • Kim, Nam-Kyun;Rie, Dong-Ho
    • Fire Science and Engineering
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    • v.29 no.2
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    • pp.79-83
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    • 2015
  • The fire accident is a representative type of disaster that can largely impact on business. Therefore, precautionary measures and rapid initial response is very important when a disaster occurs. The storage of porous combustibles is inevitable in coal yard, plywood processing industry, and others that are currently operating. Initial fire fighting of fire and identifying the ignition point in such a porous combustible storage space are so difficult that if the initial response is failed, being led to deep-seated fire, surface fire is likely to result in secondary damage. In addition, deep-seated fire can cause personal injuries and property damage due to a large amount of toxic gases and reignition. Therefore damage reduction measures is required around the storage space to handle a porous flammable. Improving the penetration performance of the concentration of the surfactant is carried out as underlying study, which is about an deep-seated fire extinguishing efficiency augmentation when using wetting agents. The porous materials used in the experiments is radiata pine wood flour, which occupies more than 75% of the domestic wood market. Fire fighting water is selected as Butyl Di Glycol (BDG), which is being used for infiltration extinguishing agent, and the experiment was carried out by producing a standard solution. The experiment was carried out on the basis of the Deep-Seated Fire Test of NFPA 18. The amount of watering, porous material to the internal amount of penetration, and runoff measurement out of the porous material was conducted. According to experimental results, as the surface tension is reduced, the surfactant concentration macroscopic penetration rate decreases, but infiltration to a porous material is shown to have growth characteristics.

A Study on the Application of Bushings Fire Prevent Structure to Prevent Fire Spread of Transformer (변압기의 화재확산 방지를 위한 부싱 방화구조체 적용에 관한 연구)

  • Kim, Do-Hyun;Cho, Nam-Wook;Yoon, Choung-Ho;Park, Pil-Yong;Park, Keun-Sung
    • Fire Science and Engineering
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    • v.31 no.5
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    • pp.53-62
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    • 2017
  • Electric power which is the energy source of economy and industries requires long distance transportation due to regional difference between its production and consumption, and it is supplied through the multi-loop transmission and distribution system. Prior to its actual use, electric power flows through several transformations by voltage transformers in substations depending on the characteristics of each usage, and a transformer has the structure consisting of the main body, winding wire, insulating oil and bushings. A transformer fire that breaks out in substations entails the primary damage that interrupts the power supply to houses and commercial facilities and causes various safety accidents as well as the secondary economic losses. It is considered that causes of such fire include the leak of insulating oil resulting from the destruction of bottom part of bushings, and the chain reaction of fire due to insulating oil that reaches its ignition point within 1 second. The smoke detector and automatic fire extinguishing system are established in order to minimize fire damage, but a difficulty in securing golden time for extinguishing fire due to delay in the operation of detector and release of gas from the extinguishing system has become a problem. Accordingly, this study was carried out according to needs of active mechanism to prevent the spread of fire and block the leak of insulating oil, in accordance with the importance of securing golden time in extinguishing a fire in its early stage. A bushings fireproof structure was developed by applying the high temperature shape retention materials, which are expanded by flame, and mechanical flame cutoff devices. The bushings fireproof structure was installed on the transformer model produced by applying the actual standards of bushings and flange, and the full scale fire test was carried out. It was confirmed that the bushings fireproof structure operated at accurate position and height within 3 seconds from the flame initiation. It is considered that it could block the spread of flame effectively in the event of actual transformer fire.

A Study on Fire Prevention Measures through Candle Fire Case and Reproduction Experiment (촛불화재사례 및 재현실험을 통한 화재예방대책 연구)

  • Lee, Jeong-Il;Kim, Young-Soo
    • Journal of the Society of Disaster Information
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    • v.15 no.1
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    • pp.12-19
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    • 2019
  • Purpose: The purpose of the study is to reduce the fire of the same type by analyzing the form which is mainly generated based on the result of the fire investigation through the experiment to reproduce, since the candle fire is repeated every year with the same type. Methods: For the analysis of candle flame, 4 kinds of methods such as acrylic recharge test, FOMEX acrylic recharge test, general combustible recharge test, and natural fire extinguishing test of candle were conducted. Results: It was confirmed that continuous burning is difficult to be achieved without contact of combustible materials around. Conclusion: In order to prevent a candle fire, it is important to check the safety of the surrounding area. It is also considered to introduce safety regulations such as finishing with a fireproof material such as a silver foil at the terminal end.