Impressed Current System Power

ICCP works by applying a direct current to the metal structure. This current suppresses naturally occurring anodic currents and therefore prevents corrosion. Key components of an ICCP system include:

ICCP Anode: This is a titanium element coated in mixed metal oxide capable of delivering high current housed in an insulating material.

Reference Electrode: This is a fixed reference cell, mainly Zinc, measuring the hull potential at the seawater interface.

Power Supply: This device monitors the system performance and automatically provides the electrical current to drive the cathodic protection process.

The anode and reference electrode are mounted through the hull but are electrically insulated from the hull, and the power supply connects to both. When the power turns on, the reference cell measures the hull potential and is compared against a preset value which is suitable to prevent corrosion by delivering the correct amount of current, a current flows from the anode to the structure, impressing a current onto the surface suppressing anodic currents keeping the structure cathodic and protected. Finally, the control unit makes sure the ICCP is performing effectively. 

If you’ve decided to utilize ICCP, the implementation isn’t too different from any other corrosion prevention method.

Here are the steps:
First, evaluate your marine environment and structure to determine the appropriate anode, reference electrode and power supply requirements. For instance, a tropical or subtropical region with high salinity and temperatures may require a higher current demand than a polar region.

Next, develop a detailed design plan. It should include the placement of anodes, power supply, control unit, and cables. You can adjust this plan as needed.

Follow the design plan to install the ICCP system. You might need to hire a technician for proper grounding and cable routing.

However, the work doesn’t end with installation. You’ll need to monitor your ICCP system to ensure protection is being achieved. It’s also wise to monitor and replace the hull equipment if needed. Lastly, calibrate the control unit periodically to make sure the measurements are accurate.

If your ICCP is ineffective, it could be due to several reasons. The main reason is poorly maintained systems left uncalibrated.

It’s also possible that the anode and power supply placements need to be optimized. You can always revise your design plan with the help of an ICCP specialist.

To ensure the effectiveness of an ICCP system, best practices should be followed during installation and maintenance:

Proper Design: The ICCP system should be designed by a qualified corrosion expert, taking into account the specific application and environmental conditions.

Regular Maintenance: Regular maintenance is necessary to ensure the continued effectiveness of the ICCP system, including monitoring the impressed current, checking the anode condition, and inspecting the cathode for signs of corrosion.