| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and device for replacing gas in a gas pipe that enable to easily discharge gas staying in the gas pipe to the outside without being affected by the shape of the gas pipe and without damaging the inner peripheral surface of the gas pipe. <P>SOLUTION: The method for replacing gas in a gas pipe includes: a tube connection step for connecting one end 2a of a tube 2, whose one end 2a is opened and whose the other end 2b is closed, to a first communication pipe 13 of a gas pipe 10; a tube insertion step in which tube filling gas is filled into the tube 2 and the tube 2 is inserted into the gas pipe 10 while inverting the tube; a gas discharge step in which the tube filling gas is filled into the inverted tube 2 so as to inflate the tube 2 and to discharge gas G1 staying in the gas pipe 10 through a second communication pipe 15 of the gas pipe 10; and a tube extraction step in which the tube filling gas is discharged from inside the tube 2 in order to contract the tube 2 and to extract the tube 2 from the gas pipe 10. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
