Autogenous Metallic Pipe Leak Repair in Potable Water Systems

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• 作者：Min Tang ; Simoni Triantafyllidou ; Marc A. Edwards
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 21, 2015
• 年：2015
• 卷：49
• 期：14
• 页码：8697-8703
• 全文大小：360K
• ISSN：1520-5851

文摘

Copper and iron pipes have a remarkable capability for autogenous repair (self-repair) of leaks in potable water systems. Field studies revealed exemplars that metallic pipe leaks caused by nails, rocks, and erosion corrosion autogenously repaired, as confirmed in the laboratory experiments. This work demonstrated that 100% (N = 26) of 150 渭m leaks contacting representative bulk potable water in copper pipes sealed autogenously via formation of corrosion precipitates at 20鈥?0 psi, pH 3.0鈥?1.0, and with upward and downward leak orientations. Similar leaks in carbon steel pipes at 20 psi self-repaired at pH 5.5 and 8.5, but two leaks did not self-repair permanently at pH 11.0 suggesting that water chemistry may control the durability of materials that seal the leaks and therefore the permanence of repair. Larger 400 渭m holes in copper pipes had much lower (0鈥?3%) success of self-repair at pH 3.0鈥?1.0, whereas all 400 渭m holes in carbon steel pipes at 20 psi self-repaired at pH 4.0鈥?1.0. Pressure tests indicated that some of the repairs created at 20鈥?0 psi ambient pressure could withstand more than 100 psi without failure. Autogenous repair has implications for understanding patterns of pipe failures, extending the lifetime of decaying infrastructure, and developing new plumbing materials.