| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water piping having superior heat insulating property, surely protecting a going pipe and a returning pipe, and simplified in its construction work, with respect to the hot water piping used in a gas hot water heating system for circulating the hot water. SOLUTION: This hot water piping 1 has the going pipe 3 and the returning pipe 5 for circulating the hot water, hollow cylindrical parts 17, 18 accommodating the going pipe 3 and the returning pipe 5 in a state of aligning pipe axes, a connecting part 19 for separably connecting the hollow cylindrical parts 17, 18 from a pipe end part along the pipe axes, and a heat insulating flexible envelope pipe 7. COPYRIGHT: (C)2005,JPO&NCIPI
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