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00735 CATHODIC PROTECTION SYSTEM DESIGN FOR THE COLVILLE RIVER

Picture for 00735 CATHODIC PROTECTION SYSTEM DESIGN FOR THE
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Product Number: 51300-00735-SG
ISBN: 00735 2000 CP
Author: Timothy Bieri, E.I.T., Kurt Lawson, Cory A. Wilder
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The Colville River cathodic protection (CP) system is unique in many ways. The cased pipelines are isolated from the mainline CP system and are directionally drilled 85 feet (26 m) below the river surface. Both thawed soils under the active channel and frozen soils under the floodplain and river banks characterize the crossing. These conditions make for differential thermal and soil resistivity states over time. The CP system is designed to protect the casings from external corrosion, and must function in a very dynamic and aggressive environment. High temperature and high chloride content characterize the operating environment for the pipelines. The design of this system utilized laboratory testing of soils, a Finite Element Analysis (FEA) modeling effort, and a unique anode and reference electrode design. The anode is constructed out of an 8 inch (220 mm) seamless steel pipe that has a series of internal redundant positive connections as well as five (5) reference electrodes used for monitoring. Key words: Horizontal directional drilling, impressed current, steel anode, steel reference electrode, casing, arctic, remote monitoring, permafrost, cathodic protection
The Colville River cathodic protection (CP) system is unique in many ways. The cased pipelines are isolated from the mainline CP system and are directionally drilled 85 feet (26 m) below the river surface. Both thawed soils under the active channel and frozen soils under the floodplain and river banks characterize the crossing. These conditions make for differential thermal and soil resistivity states over time. The CP system is designed to protect the casings from external corrosion, and must function in a very dynamic and aggressive environment. High temperature and high chloride content characterize the operating environment for the pipelines. The design of this system utilized laboratory testing of soils, a Finite Element Analysis (FEA) modeling effort, and a unique anode and reference electrode design. The anode is constructed out of an 8 inch (220 mm) seamless steel pipe that has a series of internal redundant positive connections as well as five (5) reference electrodes used for monitoring. Key words: Horizontal directional drilling, impressed current, steel anode, steel reference electrode, casing, arctic, remote monitoring, permafrost, cathodic protection
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