Abstract
Effects of anode geometry, area, location and number upon the protection provided by ship ICCP systems and the current output from individual anodes have been examined by stylised DACS physical modelling of a hull protected by ICCP in static and simulated under way conditions. Data is presented for the potential profiles produced over the model and the current outputs from individual anodes when they are employed in single zone ICCP configurations with one, two and four anodes. Theoretical equations for anode "throw" are shown to provide a reasonable approximation of potentials in their vicinity. Different types of anode have very similar current outputs when employed singly in a one anode configuration. If two or more anodes are present in a zone, however, the output of an individual anode is determined by its area and location relative to the propellers. Potential spikes are decreased by reducing the number of anodes. In the context of general design criteria, protection along the general length of the hull can be provided by strip anodes, with disc anodes employed for localised protection in the region of the after cut-up and propellers.
