Interaction of Ship and Dock Cathodic Protection Systems Predicted from Potential Measurements of a Seawall at Panama City, Florida.
Final technical rept.,
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SURVIVABILITY STRUCTU RES AND MATERIALS DIRECTORATE
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Carderock Division, Naval Surface Warfare Center technologists took potential voltage measurements on a seawall located at the Naval Coastal Systems Center in Panama City, FL to determine whether a large cathodic protection system on a pier or dock could cause stray current corrosion or cathodic protection control problems on a ship docked to the structure. The measurements were taken because, while the protection system on the sea wa 11 was providing adequate protection, one rectifier was not working properly. Minimal local potential gradients were found near the sea wall anodes. This should have had no effect on ships docked with the use of bumpers, which provide spacing of at least 0.5 m from the sea wa II. Rectifier shutdown or inadequate rectifier balance of the same potential can lead to potential differences over distances of roughly ship length pro. portions to cause control problems on a ship 5 cathodic protection system. To avoid this, multiple seawall rectifiers should be periodically checked for proper operation and balanced to the same control potential. A ship should not be docked so that it bridges the area between two rectifiers that are not properly balanced to the same potential. MM
- Civil Engineering
- Submarine Engineering