Record Display for the EPA National Library Catalog


Main Title Seattle Distribution System Corrosion Control Study. Volume 2. Tolt River Water Pilot Plant Study.
Author Herrera, C. E. ; Hoyt, B. P. ;
CORP Author Seattle Dept. of Water, WA.;Municipal Environmental Research Lab., Cincinnati, OH.
Year Published 1984
Report Number EPA-R-806686; EPA-600/2-84-065;
Stock Number PB84-170810
Additional Subjects Corrosion prevention ; Distribution systems ; Plumbing ; Water treatment ; Tolt River ; Pilot plants ; Penetration ; Sodium carbonates ; Calcium oxides ; Bicarbonates ; Protection ; Steels ; Lead(Metal) ; Zinc ; Copper ; Dosage ; Cedar River ; Water supply ; Washington(State) ; Graphs(Charts) ; Photographs ;
Library Call Number Additional Info Location Last
NTIS  PB84-170810 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 111p
For 6 months, the Seattle Water Department conducted a corrosion treatment pilot plant study, obtaining data on the treatment of Tolt River water with lime/sodium carbonate, lime/sodium bicarbonate, and lime/bicarbonate/silicate. Continuous-flow pipe coupon tests were conducted to determine corrosion rates, penetration rates, and corrosion types for copper, galvanized steel and black steel pipes. Metal leaching tests were conducted using small diameter pipes. Research showed that using lime plus sodium carbonate, lime plus sodium bicarbonate, and lime plus bicarbonate plus silicate will significantly reduce corrosion in home plumbing systems. Based on this pilot study, lime plus sodium carbonate treatment is recommended for the Cedar River water supply at an average dosage of 1.7 mg/L CaO. This dose should achieve an average distribution system pH of 7.9 and an alkalinity of 18 mg/l CaCO3.