| 摘要 |
PURPOSE: A dual pipe for supplying gas and a manufacturing method thereof are provided to prevent a gas leakage because a second pipe line encloses a first pipe line. CONSTITUTION: A dual pipe(10) for supplying gas comprises an inner pipe(20), an outer pipe(30), a first flange, a second flange, and a third flange(50). A first pipe line is formed in a longitudinal direction of the inner pipe. A plurality of branch ports(22) is formed on an outer surface of the inner pipe. The branch ports are connected to the first pipe line while the inner pipe is extended. The inner pipe is inserted into the outer pipe. A second pipe line is formed in the longitudinal direction of the outer pipe line. A connection passage(55) of the third flange is connected to the first pipe line. The third flange is connected to the branch ports and an edge of a through-hole.
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