| 摘要 |
PROBLEM TO BE SOLVED: To provide a piping connection structure and its manufacturing method capable of improving installing and removing workability of equipment connected by piping, while maintaining rugged piping conditions. SOLUTION: An annular engaging part which swells out in the axial direction in an end of unilateral piping is provided and at the same time, in the piping connection structure which connects two piping by caulking the end of the other piping in the annular engaging part, a protrusion is provided in the caulking part of the other piping and the piping connection structure and its manufacturing method are characterized in that the protrusion is abutted to the annular engaging part. COPYRIGHT: (C)2006,JPO&NCIPI
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