| 摘要 |
PURPOSE:To easily inhibit corrosion of a lining water piping system and to prevent the generation of reddish water by passing a current larger than a corrosion inhibitive current between a corrosion resistance anode provided in the pipe joint of the above-mentioned piping system and a metal exposed surface, then passing the current lower than this current. CONSTITUTION:A lifting pipeline 4 and a water feed pipeline 6 constituted by connecting plural lining pipes 7 with pipe joints, such as sockets 8, elbows 9 and tees 10, are connected to a lifting pump 2, a water storage tank 3, etc. The corrosion resistance anode 11 is disposed in an insulated and liquid tight state into the above-mentioned pipe joints of the water distributing system 1 consisting of the above-mentioned lining piping system. This anode 11 is preferably disposed at every pipe joint. The current is then passed between the above-mentioned anode 11 and the metal exposed surface in the pipe joints from a constant current source. The specified current larger than the corrosion inhibitive current is passed at this time to form the corrosion inhibitive film on the above-mentioned metal exposed surface. The specified current larger than the corrosion inhibitive current and lower than the current in the above- mentioned corrosion inhibitive film forming stage is passed throughout at the time when the water flows and at the time when the water stops to maintain the above-mentioned corrosion inhibitive film. The corrosion of the lining water piping system is inhibited in this way and the generation of the reddish water is efficiently prevented. |
