• Title/Summary/Keyword: Room fire

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Analysis of Installation Environment and Fire Risk of Induction Motors Installed in the Curing Process of a Rubber Product Manufacturing Plant (고무제품제조공장의 가류공정에 설치된 유도전동기의 설치환경 및 화재위험성 분석)

  • Jong-Chan Lee;Doo-Hyun Kim;Sung-Chul Kim
    • Journal of the Korean Society of Safety
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    • v.38 no.2
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    • pp.23-29
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    • 2023
  • This study analyzed the fire status of a rubber product manufacturing factory based on 19 years of fire data. Through the analysis of the current state of fire, electrical fires accounted for 58.19%, and among electrical fires, motor fires were the highest at 26.21%. For the motor fire occurrence process, the curing process accounted for the highest rate of 51.9%. Therefore, the installation environment was investigated for the motor in the curing process, and it was confirmed that the motor's maximum ambient temperature exceeded 40℃. In particular, in the case of the motor for curing operation, the motor was installed in a separate motor room, so the average indoor temperature was 48.10℃ and the motor frame's maximum temperature was 72.80℃. In this study, the risk of motor fire was confirmed through a field survey, and a safety management plan was derived by finding a process with high fire risk and conducting an experiment on the motor's installation environment and electrical characteristics in that process.

Study on the Limiting Oxygen Index of Curtain Exposed to High Temperature (고온에 노출된 커튼의 한계산소지수에 관한 연구)

  • Kim, Hwang-Jin
    • Fire Science and Engineering
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    • v.32 no.5
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    • pp.1-5
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    • 2018
  • Curtains are used for shading in windows. Since most curtains are made of flammable materials and are installed vertically, curtains can be an important factor in fire spreading. Accordingly, it is important to predict fire behaviors in studies on the combustion characteristics of flammable interior decorations, such as curtains. In this study, to analyze the combustion characteristics of six kinds of curtains, which are widely used interior decorations, the oxygen index was measured at room temperature and higher temperature. As a result of the experiment, the oxygen index at higher temperature of all specimens was about 3%~7.5% lower than that at room temperature and difference of 0.2% of oxygen index show big differences in combustion phenomenon of specimens. Therefore, when flame retardancy is evaluated with the oxygen index value of flammable interior decorations, the oxygen index value at higher temperature should be sufficiently considered.

A Study on the Essential Information to Collect Disaster Sites for Effective Disaster Management : Focused on Jecheon Sports Center Fire case (효율적인 재난 상황관리를 위한 재난현장 필수정보 연구: 제천 스포츠 센터 화재사건을 중심으로)

  • Cho, Jung-Yun;Song, Ju-Il;Jang, Moon-Yup;Jang, Cho-Rok
    • Journal of the Society of Disaster Information
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    • v.16 no.1
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    • pp.70-78
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    • 2020
  • Purpose: When a disaster occurs, information is collected and sent indiscriminately to the disaster safety situation room, making it difficult to make quick and correct decisions. Therefore, in this study, both the field response team and the situation room attempted to derive the essential information elements for disaster management so that they can identify and respond optimally. Method: In this study, the actual disaster response process was first identified based on the case of large-scale fire disasters in multi-dense facilities. Afterwards, essential information on disaster management was obtained by analyzing the standard manual for large-scale fire crisis management in multi-dense facilities and the fire situation report form prepared at the time of disaster. Result: The Essential information on disaster management was divided into four stages: situation reception·reporting·transmission, total response·regional emergency rescue control group·regional disaster safety task force, operation stage of central emergency rescue control group·central disaster safety task force, and recovery stage. Since then, the information to be collected at each stage and the information relevant to core tasks are presented. Conclusion: The Essential information on disaster management thus obtained can serve as a guide for the person who collects information on site to collect information efficiently. In addition, it is expected that the situation room in charge of disaster response decision-making will receive only the information necessary for decision making, so that it is possible to make a quick situation decision and more efficient disaster situation management.

Method for Preventing Asphyxiation Accidents by a CO2 Extinguishing System on a Ship (선박 내 CO2 소화설비에 의한 질식사고 방지 기법)

  • Ha, Yeon-Chul;Seo, Jung-Kwan;Hwang, Jun-Ho;Im, Kichang;Ryu, Sang-Hoon
    • Fire Science and Engineering
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    • v.29 no.6
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    • pp.57-64
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    • 2015
  • Carbon dioxide extinguishing systems are broadly used for onshore and offshore fire accidents because of excellent performance and low cost. However, there is risk with carbon dioxide systems, which have caused many injuries and deaths by suffocation associated with industrial and marine fire protection applications. In this study, a numerical analysis was performed to predict the fire suppression characteristics of a carbon dioxide system in the compressor room of ships. A double protection safety system is suggested to prevent suffocation accidents from carbon dioxide extinguishing systems. Four scenarios were selected to study the variation of the heat release rate, maximum temperature, a $CO_2$ and $O_2$ mole fraction, and fire suppression characteristics with the carbon dioxide system. The importance of proper design is suggested for a ventilation system in the compressor room of ships.

Floor Impact Sound Pressure Level Characteristics by the Change of Reverberation Time in a Reverberation Chamber (수음실 잔향 시간변화에 따른 바닥충격음레벨 특성 - 잔향실을 중심으로 -)

  • Jeong, Jeong Ho;Kim, Jeong Uk;Jeong, Jae Gun
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.3
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    • pp.274-281
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    • 2013
  • Field measurement method of heavy/soft impact sound pressure level which is regulated in JIS and ISO has been using in Korea, Japan and Canada. It is reported that heavy/soft impact sound pressure level was varied by the sound field condition of receiving room such as sound absorption power and room volume. In this study, it is checked that heavy/soft impact sound pressure level was affected by the receiving sound field condition. Rubber ball and bang machine sound pressure level was measured in the vertically connected reverberation chamber. In oder to check the effect of receiving sound field on heavy/soft impact sound pressure, sound absorption power was changed with polyester sound absorption blankets with air space and glass wool. The reverberation time at 1 kHz band was changed from 10 s to 0.2 s by sound absorption material. Rubber ball sound pressure level measured without sound absorption material was 58 dB in $L_{i,Fmax,AW}$, but the level was 46 dB with sound absorption treatment. From this result, it is confirmed that sound field correction method is needed in the heavy/soft impact sound pressure level measurement method using bang machine and rubber ball.

The Effects of the Area of Openings on the Performance of a $CO_2$ Extinguishing System -The CFD Simulations of the Oil Surface Fire in a Machine Room- (개구부 면적이 $CO_2$ 소화설비의 소화성능에 미치는 영향 -기계실 석유 표면화재의 CFD simulations-)

  • Jeon, Heung-Kyun;Choi, Young-Sang;Park, Jong-Tack
    • Fire Science and Engineering
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    • v.22 no.1
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    • pp.1-9
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    • 2008
  • Carbon dioxide($CO_2$) agent, which has more safely extinguished fire than any other gaseous fire extinguishing agents, has been widely used in various protected enclosures and types of fires. According to the concept of performance-based design(PBD). $CO_2$ extinguishing system to be designed is needed to be evaluated for the performance of fire suppression with possible fire scenarios in an enclosure. In this paper, CFD simulations were carried out to study the effects of opening area on the performance of $CO_2$ extinguishing system and the flow characteristics in the machine room of $100m^3$ in which kerosene spill fire happened. This study showed that time of fire suppression increased linearly in proportion to the size of opening area, and fires for each model were completely suppressed prior to the end of discharge of $CO_2$ agent. It was shown that mass flow rate through opening was influenced by the combined effects of heat release rate of fire and discharge of $CO_2$ agent. After $CO_2$ agent was completely discharged, oxygen concentrations in enclosures for each model were lower than the limit concentration of combustion.

Analysis of the Working Conditions of Fire Protection Systems in the Goyang Bus Terminal Building Fire (고양종합터미널화재 시 소방시설의 작동실태 분석)

  • Lee, Eui-Pyeong
    • Fire Science and Engineering
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    • v.32 no.3
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    • pp.95-107
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    • 2018
  • This study analyzed the working conditions of the fire protection system in the Goyang Bus Terminal fire based on the fire investigation results. The results were as follows. First, extinguishing using an indoor fire hydrant was not attempted immediately after the fire burned the ceiling urethane foam. Second, a sprinkler alarm valve was turn off and did not work in the repair work space of the 1st basement. On the other hand, the sprinklers in the $2^{nd}$ basement, $1^{st}$ floor, $2^{nd}$ floor, and $3^{rd}$ floor worked and prevented the fire from moving to stories other than the $1^{st}$ basement. Third, although an exit light worked normally, it was not installed in the exit from the waiting room in the $2^{nd}$ floor to the bus stop. This resulted in many casualties. Fourth, although a fire receiver sent an electrical signal to the fan controller of the smoke control system, it was treated manually in the fan controller and the fan in the $2^{nd}$ floor did not work.

Study on the effective response method to reduce fire risk of wood fuel heating system (화목 연료 난방설비의 화재 위험 감소 방안에 관한 이론적 연구)

  • Park, Kyong-Jin;Lee, Bong-Woo;Lee, Guen-Cull;Nam, Ki-Hun
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.2
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    • pp.163-171
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    • 2019
  • Recently, rural housing in urban areas has been increasing due to the improvement of income level. With the increase of the construction of the power house, the installation of the heating system using the harmonious fuel for the purpose of heating and the beauty of the room is increasing rapidly. In addition to the increasing use of firewood heating equipment, the incidence of fire is also increasing. Analysis of the National Fire Data System of the Fire Department The result of the analysis of the National Fire Data System Many parts of the fire are incinerated by the accumulation of tar due to the incompleteness of periodic cleaning inside the cylinder. The distance between the fire extinguisher and the combustible materials such as ceiling, Resulting in fire. In addition, it was found that much of the fire of the firewood heating system in the time zone occurs during the sleeping and resting time and there is not enough time for the residents to cope. This, in turn, causes serious harm to the lives and property of the users of the pyrotechnic heating system. Therefore, in this study, domestic and foreign standards and laws related to fuel oil heating facilities were analyzed and 12 cases of fire accidents were analyzed. Through the revision of the fire prevention and firefighting facilities installation and maintenance law, the installation standards of the alarm and fire extinguishing facilities were presented.

A Study on the Effective Smoke Control Method of Large Volume Space Comparted by Smoke Reservoir Screen (제연경계벽으로 구획된 대형공간의 효과적인 제연방안에 관한 연구)

  • Kim, Tae-Hoon;Kwon, In-Kyu
    • Fire Science and Engineering
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    • v.25 no.1
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    • pp.34-41
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    • 2011
  • This research examines problem that can happen in partial smoke control method among contiguity area smoke control system through engineering examination and CFD. And the ultimate purpose of this is to secure safety of a person inhabiting at fire department by presenting improvement plan. Now a days, in large space-area such as department store or mega-mall in which mainly applies "Partial Smoke Control Method", air is suppled from adjacent area and smoke is exhausted in fire room. For various reason, however, it is confirmed through simulation that if air is suppled in one direction, this can cause a fatal result to people of fire area because of the difficulty in securing the evacuation time. As an improvement plan, air is supplied at the same time in surroundings to fire department.

A Study of the Application of Inert Gas Generator to the Fire Extinguishing System (불활성 가스 발생장치(Inert Gas Generator) 소화시스템 적용에 관한 연구)

  • Han Yong-Shik;Kim Myoung-Bae;Kim Su-Yong
    • Fire Science and Engineering
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    • v.19 no.2 s.58
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    • pp.69-74
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    • 2005
  • A study of the utilization of inert gas generator(IGG) that generates a large amount of inert gas for the fire extinguishing equipment was performed. In this study, the fire extinction performance of gas generated from a 1GG which is implemented to a gas turbine was investigated. A simulated mixture gas of which composition is the same as that of the gas generated from ICG was used in all experiments. First, the extinction concentration was measured using a cup burner method. The extinction design concentration and the volume of extinction space was calculated by applying the obtained extinction concentration to a method recommended by NFPA 2001. In practical respects, the fire extinction performance of IGG-generated gas was confirmed through the fire suppression experiment within a $2m\times2m\times2m$ room.