MONITOR & MAINTAIN
Controller power unit
The DC output controller power unit operates from the ships DC supply system in order to ensure a balanced load on the generator plant and a smooth DC output. The DC regulation of power to the GreenAmp Marine ICCP system controls the amount of DC current require to provide the cathodic protection of the hull while also logging up to five years of operating data. The GreenAmp Marine technology also allows for remote access to both the data and the operational parameters of the GreenAmp Marine system.
The system normally incorporates one basic type of anode which uses inert materials in order to provide a long system life. The anode is encapsulated in glass reinforced resin which is attached to the external surface of the hull. Since, in service, current output involves local high current densities and voltage gradients, a dieletric shield of suitable area is used in the immediate vicinity of the anode.
These anode types are employed on all types of vessels where anodes are installed in way of the engine room. The high current output of anodes means that a dielectric shield area is required and
as the plating in way of these anodes is generally curved, it is necessary to use an applied epoxy mastic, rather than a rigid sheet type shield. The hull penetration arrangements for all types of anodes include a watertight cofferdam assembly with double gland sealing, and are approved by all major Classification Societies.
A minimum of two and most often four stabilised zinc reference electrodes are used to monitor hull potential and control the output of each GreenAmp Marine Automatic Impressed Current Cathodic Protection System DC power supply unit/s.
Provided the propeller shaft/s are adequately grounded by correctly designed earthing assemblies, the GreenAmp Marine automatic ICCP systems will inhibit dezincification of bronze propellers and provide protection to the propellers and shafts.
The rudder grounded to the hull by heavy flexible copper conductors (usually yard supplied and fitted) are also protected by the GreenAmp Marine Automatic Impressed Current Cathodic Protection systems.