The Fluctuation of the Time to Extinguish the Oil Fires with Dry Powder Extinguishing Agent

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  • KIDA Hajime
    Japanese National Railways, Railway Technical Research Institute

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  • 油火災を粉末消火剤で消火するときの消火時間のちらばり
  • ユ カサイ オ フンマツ ショウカザイ デ ショウカスル トキ ノ ショウカ

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The fluctuation of the time to extinguish the flame of burning gas oil in a fire pan with multipurpose dry powder extinguishing agent was studied. <br>A series of extinguishing experiments were carried out under nominally same experimental conditions. <br>Resulting frequency distribution of the time to extinguish the flame showed relatively wide scatter and unsymmetrical shape. <br>The time dependancy of the proportion of the cases in which flame extinction at time interval Δt following time t to the cases in which extinction did not occur before time t was small. (The start of discharge of powder was taken as t=0.) <br>This characteristics may be explained from the assumption that gradual accumulation of the powder in the flame is small and the powder discharged in the very short period prior to extinction have major effect to the extinction.

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