CORROSION INVESTIGATIONS, TRACY-RED BLUFF, CALIFORNIA, EHV DIRECT-CURRENT TESTS.
BUREAU OF RECLAMATION DENVER COLO
Pagination or Media Count:
Test measurements were made to determine the maximum distance from the two types of electrodes at which corrosion prevention procedures would be necessary for protecting buried metallic structures. It was concluded that the use of EHV d-c ground return at current levels used in tests would 1 promote serious corrosion of buried metalwork in Area 1 within approximately 12-mile radius of the electrode if a ground mat electrode were used and mild corrosion if a deep-well electrode were used 2 promote negligible to serious corrosion of buried pipelines in Area 2 12-3 mile radius of either a ground mat or deep-well electrode depending upon 1 the distance of the pipelines from the electrode 2 the geometry of the two electrode-pipeline systems and 3 the horizontal extent of the pipelines 3 impress no significant stray currents on buried pipeline in Area 3 beyond approximately a 3-mile radius of the electrode. Normal corrosion prevention techniques are fully adequate to prevent stray current corrosion of buried metalwork if proper location of the electrode is made. These conclusions must be modified to reflect the anticipated time-current product. Author