This paper describes an experimental investigation of pressure reduction, which is initiated by a sudden discharge of compressed air from a long pipe installing branch pipes to the atomosphere. The experiments have been made by changing the geometrical parameters : main pipe length, branch pipe length and orifice ratio. It has been made clear that the time Δ
to for the pressure reduction ratio ξ=0.17 in branch pipe length Y=1.5 m is almost the same as that for the case without branch pipes. The time Δ
to is not greatly affected by the branch pipe length in the case of the main pipe length being relatively short, but it is affected by the branch pipe length in the longer main pipe.
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