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The influence of water sprays on propagation process of gaseous flames is presented in the paper. Data were obtained in the vertical perspex tube of 0.7 m in length and 0.08 m in diameter. Example pictures showing flame quenching and flame acceleration by means of water sprays are shown. Furthermore simplified mathematical calculations of maximum diameter of water droplets providing the effective suppression of propagating gaseous flame are made. Experimental results and theoretical considerations show that only the water sprays with droplets which are able totally evaporate in the flame front can be the most effective in fire suppression.