| 摘要 |
PURPOSE:To reduce the cost for the piping system by constituting the inner surface of a hot water supply pipe of a pipe material having a high anticorrosive property and an inner diameter of 8.5mm or less, and arranging the hot water supply pipe integrally with a water supply pipe having the same diameter as that of the hot water supply pipe to mixed water taps through a header. CONSTITUTION:A hot water supply pipe 41 is constituted of a soft copper pipe having on its inner surface a high anticorrosive copper alloy layer and an inner diameter of 8.5mm or less, and forms a double pipe together with a water supply pipe 42 having the same inner diameter as the hot water supply pipe 41, both pipes 41 and 42 being disposed in parallel to each other and tightly wrapped with a tape 44. Further, the hot water supply pipe 41 is branched from the hot water supplier by a header and arranged to each mixed water tap. At the time of piping the hot water supply pipe 41 is inserted and laid in a synthetic resin pipe 6 previously injected at the time of concrete placing in the floor or the like. Since the diameter of the pipe materials 41 and 42 is small, the execution work is facilitated and the hot water supply piping and the water supply piping can be executed simultaneously. Since the hot water pipe 41 is anticorrosive, it can meet the speed-up of the flow rate. Therefore, the cost of works can be reduced.
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