| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple and accurate method for determining whether water leaks or not. SOLUTION: A leak investigating method is applied to a water supply pipe 3 made of lead connected to a snap tap 2 for branching from a distributing pipe 1 for water and sewerage. The supply pipe 3 connected to the snap tap 2, is connected to a water meter 4 via one, two or more of water shut-off valves. Moreover, the pipe line extends from the water meter 4 to faucets 10 prepared in a house, factory, etc. The investigating method is applied especially to leak investigation between the snap tap 2 and the water meter 4. To carry out the investigating method, first of all, the shut-off valve 5 put in a box 11 is closed, and the water meter 4 is detached from the supply pipe 3. After a predetermined period of time, six hours for example, passes, the shut-off valve 5 is opened, and water is collected from there. The concentration of lead melted in the collected water is measured, and is compared with reference data to determine whether or not water leaks. COPYRIGHT: (C)2004,JPO
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