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Sacrificial anodes for sea cables

Sacrificial anodes for cathodic protection of sea cable armouring is simple but has limitations. A sacrificial anode system normally consists of:

  • Zinc or aluminium anodes mounted on a frame assembly
  • Reference electrode for measuring the effect of the cathodic protection.
  • Connection box for anode and reference electrode connections
  • Cables from anodes, reference electrode and sea cable

Application

Due to voltage drop in the anode circuit (long cables) and low driving anode voltage, the sacrificial anodes have only capacity for local protection near the landfall area. Sacrificial anodes are mainly suited for temporary protection, until an impressed current system can be energised.