Test data are reported concerning the electrical situation at cathodically protected steel docks in petroleum service where hazardous atmospheres may exist. Particular attention is paid to the effect of rectifier operation while the ship is in dock. Results and conclusion are reported for investigations of arc energy for the magnitudes encountered at cathodically protected steel docks. Topics discussed include design of steel dock cathodic protection systems, minimum arc energy to cause ignition, and sparking tendencies. Field tests results are reported both for salt water and fresh water docking facilities. Data given include current flow and potential differences from ship to dock, internal and external resistances during salt water docking cathodic protection tests, and rectifier outputs in salt water docking cathodic protection tests. 5.2.1

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