{"accessLevel": "public", "accrualPeriodicity": "irregular", "bureauCode": ["010:10"], "contactPoint": {"@type": "vcard:Contact", "fn": "RISE Team", "hasEmail": "mailto:data@usbr.gov"}, "description": "Reclamation scientists conducted field trials of various protective linings at the Shasta Dam Unit 5 Penstock (Shasta) in 1949 and at the Collbran Project Salt Creek Siphon (Collbran) in 1959. The results of the first investigation since 1972 where Shasta and Collbran are evaluated together are reported here. Researchers used data from visual assessments and electrochemical impedance spectroscopy (EIS) to evaluate the current performance of surviving test linings at Shasta and Collbran. Visual inspections found 13Collbran lining systems exhibited no or minimal damage after 63 years. EIS data was combined with visual inspection results to investigate how dielectric characteristics might be related to the visual appearance of the test linings by applying an equivalent circuit model (ECM) to each lining system. The findings demonstrate certain formulations containing coal-tar, red lead, vinyl, chlorinated rubber, or epoxy mastic can provide corrosion protection for over 50 years of service. Future work includes experimental validation of ECM results with quantitative elemental mapping of long-term coating test panels; correlation of ECM results to corrosion rates and degradation mechanisms; identification of thresholds for EIS data and/or ECM results and validation of ECM for field EIS data.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://data.usbr.gov/catalog/7990/item/128546", "description": "Landing page for \"S&T Project 22024 Final Report: Learning from the Past, Inspection of Historic Penstock Lining Field Trials; Shasta Penstocks and Collbran Siphon\"", "mediaType": "text/html", "title": "RISE Item Details Page URL for \"S&T Project 22024 Final Report: Learning from the Past, Inspection of Historic Penstock Lining Field Trials; Shasta Penstocks and Collbran Siphon\""}, {"@type": "dcat:Distribution", "description": "\"S&T Project 22024 Final Report: Learning from the Past, Inspection of Historic Penstock Lining Field Trials; Shasta Penstocks and Collbran Siphon\" as a PDF file", "downloadURL": "https://data.usbr.gov/rise/content-rise-public/rise/catalog-item/binary/8540-2023-43_Historic%20Linings_ST_Final_Report_Signed.pdf", "mediaType": "application/pdf", "title": "PDF File for \"S&T Project 22024 Final Report: Learning from the Past, Inspection of Historic Penstock Lining Field Trials; Shasta Penstocks and Collbran Siphon\""}], "identifier": "https://datainventory.usbr.gov/rise/item/128546", "keyword": ["Collbran Project", "Corrosion Protection", "Equivalent Circuit Model (ECM)", "Field Electrochemical Impedance Spectroscopy (EIS) Testing", "Historic Linings", "Salt Creek Siphon", "Shasta Dam"], "landingPage": "https://data.usbr.gov/catalog/7990/item/128546", "modified": "2023-11-14T22:46:30Z", "publisher": {"@type": "org:Organization", "name": "Bureau of Reclamation"}, "spatial": "{\"type\":\"Polygon\",\"coordinates\":[[[-124.508,48.197],[-124.304,40.096],[-117.02,32.608],[-103.405,29.136],[-93.466,30.77],[-94.692,38.939],[-97.279,48.946],[-122.67,48.946],[-124.508,48.197]]]}", "title": "S&T Project 22024 Final Report: Learning from the Past, Inspection of Historic Penstock Lining Field Trials; Shasta Penstocks and Collbran Siphon"}