Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Method of Resistance Analysis of Water Stream During Fire Supperession

화재진압 시 발생하는 주수 기둥의 저항분석 방법 연구

  • Jung, Byeong-Sun (Intergis Co. Ltd.) ;
  • Kim, Eung-Sik (Division of Safety and Fire Protection Engineering, Hoseo University) ;
  • Park, Jong-Yeol (Department of Convergence Technology for Safety and Environment Graduate School, Hoseo University)
  • 정병선 (인터지스(주)) ;
  • 김응식 (호서대학교 안전소방학부) ;
  • 박종열 (호서대학교 안전환경기술융합 대학원)
  • Received : 2018.10.22
  • Accepted : 2018.11.21
  • Published : 2018.12.31
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Abstract

Fire fighters are exposed to the risk of many accidents during fire suppression, especially near the high voltage circuit. In order to prevent and analyze the electric shock accidents, measurement of water resistance is crucial. However, this has been one of the overlooked research areas and it has been very difficult to measure the mixed up resistance components separately. In this paper, we measured a total resistance of apparatus and regarded it as a serial resistance of contact resistance and length dependant resistance. Measuring the resistance by varying the length of water stream, the variable resistance and fixed contact resistance appear, which are used to calculate the both components of resistances. In addition, the resistance of fire hose can be calculated from the parallel circuit which is formed by grounding the fire hose with the resistance of water stream. Results show that we can successfully measure the resistance per unit length of water stream and fire hose, thereby proving that this method is a facile way to measure water and fire hose resistance. However, many experiments are still required to obtain the precise contact resistance of ground under various condition and the resistance between the human body and fire hose.

Keywords

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Fig. 1. Electrocutions during fire suppression.

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Fig. 2. Modeling of accident circuit.

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Fig. 3. Test apparatus and equivalent circuit.

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Fig. 4. Fire hose nozzle with electrode.

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Fig. 5. Average resistance according to length of the stream.

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Fig. 6. Resistance of fire hose according to length.

Table 1. Average resistance according to length of water stream with hose ungrounded

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Table 2. Parallel resistance value according to length of water stream with hose grounded

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Table 3. Resistance of grounded fire hose according to length

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Table 4. Resistance of fire hose per unit length and contact resistance

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Table 5. resistances of water stream and fire hose per unit length

HOJHB0_2018_v33n6_22_t0005.png 이미지

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