舶用消火装置作動時の静電気帯電に関する実験的研究

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This paper reports the results of an experiment conducted for the purpose of preventing an electrostatically initiated explosion in the operation of several types of fire extinguisher for marine use. A real scale model of fire extinguishers was used to make an engineering clarification of electrification phenomena. The following characteristics of electrification phenomena was made clear from the experimental results and discussions : (1) Generation of static electricity is concentreted on the discharge head of extinguishing fluid, (2) the electric field arround the head becomes strong and the head acts as an ignition source in a wide range of condition, when an extinguisher is operated in an explosive atmosphere, (3) The shape of the discharge nozzle shows great effects on the amount of static electrificitaon, while the material exerts little influences. Comparing the experimental data with the analytical results, the transient characteristics of the current arising from the electrification could be well explained. Further, it was also clarified experimentally using a sophisticated device that there exist the same amounts of positive and negative electric charges in the discharged gas, and that this phenomenon causes current instability. Jadging from the relationship between grounding resistance and voltage charged to an operator of powder.type portable fire extinguishers, it was concluded that the oparator will not be attacped by an electric shock if the grounding resistance is kept bellow 10^7 Ω.
独立行政法人海上技術安全研究所の論文
1988-01-30

舶用消火装置作動時の静電気帯電に関する実験的研究

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