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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