Description
This powerpoint presentation begins by providing a brief overview of the adverse consequences of partial pipe replacements and the practical concernsrelated to galvanic corrosion andPSR. Topics presented include: chloride to sulfatemass ratio (CSMR)sample calculation; causes for concern – high CSMR; and, experimental design -Cu2+ Deposition Corrosion. Cu2+ Deposition Corrosionconclusions:trace levels of Cu2+ (even 0.03 mg/L)increased lead release from lead pipe w/nogalvanic connection to Cu;deposition corrosion significant concern interms of lead leaching as per prior research; and,putting a copper pipe before a lead pipe inthe flow path, as occurs in partialreplacement, is a concern. Mechanisms ofgalvanic corrosion(Pb Pipe – Cu Pipe),new vs. aged Pb pipeCSMR is presented, along with simulated small scalepartial replacements. Conclusions indicate that:Cu2+ in water increases Pb in water(deposition corrosion); galvanic corrosion of Pb/Cu couples can besignificant – lower pH and higher Cl- at Pb junctionduring stagnation, andPb is sacrificed; simulated partial service line replacement,higher Pb (> 200%) in low CSMR water,higher Pb (>165%) in high CSMR water, andshort length of Cu relative to Pb hadhighest Pb release. Includes tables, figures.
Product Details
- Edition:
- Vol. – No.
- Published:
- 11/01/2009
- Number of Pages:
- 54
- File Size:
- 1 file , 2 MB
- Note:
- This product is unavailable in Ukraine, Russia, Belarus
