This powerpoint presentation begins by providing a brief overview of the adverse consequences of partial pipe replacements and the practical concerns
related to galvanic corrosion and
PSR. Topics presented include: chloride to sulfate
mass ratio (CSMR)
sample calculation; causes for concern - high CSMR; and, experimental design -
Cu2+ Deposition Corrosion. Cu2+ Deposition Corrosion
conclusions:
trace levels of Cu2+ (even 0.03 mg/L)
increased lead release from lead pipe w/no
galvanic connection to Cu;
deposition corrosion significant concern in
terms of lead leaching as per prior research; and,
putting a copper pipe before a lead pipe in
the flow path, as occurs in partial
replacement, is a concern. Mechanisms of
galvanic corrosion
(Pb Pipe - Cu Pipe),
new vs. aged Pb pipe
CSMR is presented, along with simulated small scale
partial replacements. Conclusions indicate that:
Cu2+ in water increases Pb in water
(deposition corrosion);
galvanic corrosion of Pb/Cu couples can be
significant -
lower pH and higher Cl- at Pb junction
during stagnation, and
Pb is sacrificed; simulated partial service line replacement,
higher Pb (> 200%) in low CSMR water,
higher Pb (>165%) in high CSMR water, and
short length of Cu relative to Pb had
highest Pb release. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 54 |
| Published : | 11/01/2009 |
