Menu
Search
Filters
Close
Menu

96131 REPLACEMENT INHIBITORS FOR HIGH LEVEL WASTE TANK COOLING COILS

Picture for 96131 REPLACEMENT INHIBITORS FOR HIGH LEVEL
Available for download
Product Number: 51300-96131-SG
ISBN: 96131 1996 CP
Author: Bruce J. Wiersma, Thomas C. Hsu
$0.00
$20.00
$20.00
Sodium chromate has been an effective corrosion inhibitor for the cooling coil systems in Savannah River Site (SRS) waste tanks for over 40 years. Due to age and operating history, cooling coils occasional y fail allowing chromated water to leak into the environment.. The costs of reporting and cleaning up chromate spills became significant enough for SRS to consider alternate inhibitors. Confirmatory tests were performed to assess the effectiveness of three alternative corrosion inhibitor systems for the waste tank cooling water systems; (1) sodium molybdate (250 ppm as Mo)/sodium hydroxide (pH 10), (2) sodium molybdate (50 ppm as Mo)/sodium silicate (50 ppm as Si), and (3) sodium nitrite (500 ppm)/ sodium hydroxide (0.01 M). The tests were conducted under stagnant conditions to simulate a worst-case scenario. The results showed that these inhibitors were as effective as chromate at minimizing general corrosion at solution temperatures between 30-70°C. However, the initiation of localized attack in crevice regions, in solutions containing the alternative inhibitors at 70°C, was observed. Also, for the nitrite and the molybdate systems to be effective, suitable biocide is needed. On the other hand, interval coupon tests showed that the molybdate inhibitor systems prevented significant propagation of the localized attack. Keywords: inhibitors, chromate, cooling water, carbon steel
Sodium chromate has been an effective corrosion inhibitor for the cooling coil systems in Savannah River Site (SRS) waste tanks for over 40 years. Due to age and operating history, cooling coils occasional y fail allowing chromated water to leak into the environment.. The costs of reporting and cleaning up chromate spills became significant enough for SRS to consider alternate inhibitors. Confirmatory tests were performed to assess the effectiveness of three alternative corrosion inhibitor systems for the waste tank cooling water systems; (1) sodium molybdate (250 ppm as Mo)/sodium hydroxide (pH 10), (2) sodium molybdate (50 ppm as Mo)/sodium silicate (50 ppm as Si), and (3) sodium nitrite (500 ppm)/ sodium hydroxide (0.01 M). The tests were conducted under stagnant conditions to simulate a worst-case scenario. The results showed that these inhibitors were as effective as chromate at minimizing general corrosion at solution temperatures between 30-70°C. However, the initiation of localized attack in crevice regions, in solutions containing the alternative inhibitors at 70°C, was observed. Also, for the nitrite and the molybdate systems to be effective, suitable biocide is needed. On the other hand, interval coupon tests showed that the molybdate inhibitor systems prevented significant propagation of the localized attack. Keywords: inhibitors, chromate, cooling water, carbon steel
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 96126 EFFECTS OF POWER LEVEL CHANGE ON THE
Available for download

96126 EFFECTS OF POWER LEVEL CHANGE ON THE DEVELOPMENT OF DAMAGE IN BOILING WATER REACTORS UNDER HYDROGEN WATER CHEMISTRY

Product Number: 51300-96126-SG
ISBN: 96126 1996 CP
Author: Tsung-Kuang Yeh, Digby D. Macdonald
$20.00
Picture for 96122 STATUS AND ISSUES IN CORROSION
Available for download

96122 STATUS AND ISSUES IN CORROSION ON THE SECONDARY SIDE OF STEAM GENERATORS

Product Number: 51300-96122-SG
ISBN: 96122 1996 CP
Author: R. W. Staehle, J. A. German
$20.00
Picture for 96119 STRESS CORROSION CRACKING OF ALLOYS
Available for download

96119 STRESS CORROSION CRACKING OF ALLOYS 690,800 AND 600 IN ACID ENVIRONMENTS CONTAINING COPPER OXIDES

Product Number: 51300-96119-SG
ISBN: 96119 1996 CP
Author: E. Pierson, J. Stubbe, G. Deny
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support