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Wednesday, January 18, 2017

Impressed Current Cathodic Protection (ICCP)



The principle of impressed current systems is that

§  Voltage difference is maintained between HULL ßà ANODES, which protect the hull against corrosion.

§  Anodes are made of non-consumable lead/silver, platinum/palladium alloys or platinized titanium.

§  The amount of current is monitored and controlled by the controller. Otherwise, there will be overprotection with wastage of current.

§  Reference cells (made of silver/silver chloride) detects the voltage between
HULL ßà REFERENCE CELL

§  An amplifier controller is used to amplify the micro-range reference cell current and it compares this with the preset protective potential value, which is to be maintained.

§  Using the amplified D.C. signal from the controller the reactor rectifier supplies larger current from ship’s A.C. power source.

§  Although the first cost is considerable, the savings on hull maintenance over the life of the ship is considerable.











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