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        Gas Mask Removal Efficiency of CO, HCl, HCN, and SO2 Gas Produced by Fire

        공하성,공예솜,김상헌 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.4

        The removal efficiencies by elastic fire gas mask of toxic gases CO, HCl, HCN, and SO2 produced by a fire have a keyrole in saving lives. The elastic fire gas mask comprises a visible window, elastic hood, gas purification canister, and airvent. It does not have hair or neck thongs, which makes it easy to use and put on quickly. This research examined theremoval efficiency of toxic gases by such a mask. The removal efficiencies for CO with a background concentration of2505.0 ppm were 99.99 and 99.98% after 3.5 and 8.5 min, respectively. The residual CO concentration was drasticallyincreased after 8.5 min. The removal efficiencies for HCl, HCN, and SO2 with background concentrations of 1003.0,399.0, and 100.3 ppm, respectively, were 100% after 20 min.

      • KCI등재

        [Retracted]Gas Mask Removal Efficiency of CO, HCl, HCN, and SO<sub>2</sub> Gas Produced by Fire

        공하성,공예솜,김상헌,Kong, Ha-Sung,Gong, Ye-Som,Kim, Sang-Heon Korean Institute of Fire Science and Engineering 2015 한국화재소방학회논문지 Vol.29 No.4

        The removal efficiencies by elastic fire gas mask of toxic gases CO, HCl, HCN, and $SO_2$ produced by a fire have a key role in saving lives. The elastic fire gas mask comprises a visible window, elastic hood, gas purification canister, and air vent. It does not have hair or neck thongs, which makes it easy to use and put on quickly. This research examined the removal efficiency of toxic gases by such a mask. The removal efficiencies for CO with a background concentration of 2505.0 ppm were 99.99 and 99.98% after 3.5 and 8.5 min, respectively. The residual CO concentration was drastically increased after 8.5 min. The removal efficiencies for HCl, HCN, and $SO_2$ with background concentrations of 1003.0, 399.0, and 100.3 ppm, respectively, were 100% after 20 min.

      • KCI등재

        Improving Performance of Foam Proportioner Utilizing Metering Venturi Type

        주승호,공하성,공예솜 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.3

        In this study, we have evaluated whether the mixing ratio is proper by creating a mixing device for foam proportionerthat mainly is employed in practice utilizing a metering venturi type. In case of the mixing ratio for 3%, water under pressureof 76 mm in diameter and the original liquid of a foam fire extinguishing agent of 31.75 mm in diameter haveshowed up the fluctuation rate just as much as 3.1~3.5% of the mixing ratio. Because water under pressure of 101.6 mmin 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 extinguishingagent of 38.1 mm in diameter have satisfied 3.0~3.9% of performance criterion. And also, in case of the 6% of mixturerate, water under pressure of 76.2 mm in diameter and the original liquid of a foam fire extinguishing agent of 31.75 mmin diameter have showed up the fluctuation rate just as much as 6.4~6.8% of the mixing ratio. Because water under pressureof 101.6 mm in diameter and the original liquid of a foam fire extinguishing agent of 38.1 mm in diameter haveshowed up 6.0~6.8% of the fluctuation rate, water under pressure of 101.6 mm in diameter and the original liquid of afoam fire extinguishing agent of 38.1 mm in diameter have satisfied 6.0~7.0% of performance criterion.

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