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Impressed Current Cathodic Protection (ICCP)

OPERATIONAL & MAINTENANCE RECORD INSTRUCTIONS

The ICCP system where fitted is an essential part of the ships equipment, designed to prevent

corrosion of the Hull and Hull Fittings.

These systems should be maintained fully operational at all times, and should only be switched off

where there are specific recommendations to do so.

Readings of system operational parameters should be recorded on the manufacturers log sheet (Or

in a similar format as per the instructions in the makers manual) and returned to the Ship

Management Office monthly. These records are be filed on-board and ashore as per the VMS Filing

System.

The records should also include the daily reading from the shaft earth millivolt meter where fitted.

It is also recommended that where practical, the log sheets are reviewed monthly by the

manufacturer, whose comments should be filed along with the records.

Maintenance schedule of the ICCP and associated earthing devices should be included in the vessel

PMS. This should be based on manufacturers guidelines.

OPERATIONAL & MAINTENANCE GUIDANCE

System Status

System shut down should only occur under specific circumstances such as during Dry Dock, after

significant underwater hull coating application, while alongside a jetty which has its own ICCP, during

STS or after specific system maintenance work such as renewal of the Di-electric Shields. In all cases

consult makers guidelines and relevant safe operation guides such as ISGOTT.

Operational Parameter Review

Regular review and trend analysis of readings should take place, especially when the vessel

experiences a change in operational status (e.g. berth/ unberth). If a review indicates any dramatic

changes in output readings then manufacturers should be contacted for advice.

Inspections

Prior Dry-Docking, the attendance of an accredited Technician is recommended to measure Hull

Potential and assess the efficiency of System Operation. When the vessel is in the Dry-Dock the

attending Technician will inspect and assess components, including Anode Di Electric Shields and the

Hull Condition to allow any necessary adjustments that will improve system efficiency .

Overview of System Fittings

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Hull

Visual inspection of the hull should be conducted whenever a suitable opportunity to view exposed

underwater areas of the hull arises, such as completion of cargo on a jetty, during a launch service,

propeller or hull cleaning. Any abnormalities in Hull Condition such as excessive or non-symmetrical

corrosion should be reported to the Ship Management Office

Shaft Earthing

Hull fittings such as Main Propeller and Rudder Shafts are electrically insulated from the Hull, due to

lubricating oil film and the use of non-metallic bearings. Insulation problems are overcome through

the use of an earth strap on the Rudder Shaft and a Slip Ring/Carbon Brush arrangement for the

Propeller Shaft when running. These are simple mechanical systems, which nonetheless, require

regular monitoring to ensure their effectiveness

Sacrificial Anode Systems

While the ICCP System offers protection to the Hull, complimentary Sacrificial Anode Systems arerequired to be fitted to protect components in vulnerable underwater hull areas, such as Stern

Frames and Thruster Tunnels. These Sacrificial Anode Systems, should be maintained in accordance

with Manufacturers Instructions.