| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for threading the connecting pipe part of a heat exchanger. SOLUTION: The connecting pipe part 222c is provided with an inclining part 222d. Since external piping can be fixed removably to the connecting pipe part 222c through a coupling 280, the need for threading the connecting pipe part 222c can be eliminated. Consequently, the external piping can be fixed to the connecting pipe part 222c or removed therefrom easily at the time of pressure test or airtightness test and production cost of the connecting pipe part 222c (heat exchanger 200) can be reduced.
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