CATHELCO ANTI-FOULING AND CORROSION PREVENTION SYSTEM FOR SEACHESTS AND SALT WATER COOLING CIRCUITS.
Cathelco's Anti-fouling System has been fitted to 20,000 ships worldwide over the last 40 years, including container ships, ferries, cruise liners, tankers, FPSOs, tugs, frigates, destroyers, fast patrol craft, luxury yachts and offshore structures, and it is the most widely used anti-fouling system for seachests and cooling pipes in the world. It is based on the electrolytic principle and is therefore very reliable.
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THE PROBLEM Marine biofouling that accumulates in ships' seachests and seawater cooling pipes, including strainers and condensers, etc.
Seawater contains millions of living organisms and once these enter the ship's cooling circuit they attach to the inner walls of pipes and seachests.
This environment is favourable for their growth, as it provides them with a surface to attach to (the inner walls of the pipes), an optimum temperature at which to grow, and a constant flow of food and oxygen thanks to the volume of water that passes through the pipes.
All the pipes and seachests therefore become blocked by living organisms that are attached to them, reducing the diameter of the pipes, just as cholesterol blocks up our arteries, and thus reducing the flow of water and collapsing the ship's whole cooling circuit.
THE SOLUTION Cathelco's Anti-fouling and corrosion prevention system generates copper ions from the seachest itself, which are transported by the flow of water and kill the organisms, acting as a powerful biocide. At the same time it generates aluminium and iron ions that prevent the corrosion of steel and cupronickel pipes, respectively.
IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM FOR COMPREHENSIVE PROTECTION AGAINST CORROSION OF THE HULL, PROPELLERS AND RUDDERS.
Cathelco's C-Shield System is the most technically advanced and versatile system on the market. Since it was introduced in 1991 it has been fitted to more than 21,000 ships worldwide.
Cathelco has created a series of ICCP (Impressed Current Cathodic Protection) systems for all types of vessels. The C–Shield system combines the advanced design of the control panel with an unusually wide range of hull anodes.
There are also systems that have been specially designed for fast ferries with steel and aluminium hulls and compact systems for smaller craft.
Whatever the ship, Cathelco can offer the latest in effectiveness and reliability to combat corrosion of the hull.
THE PROBLEM Corrosion on the wetted surface of the hull, propellers and rudders is inevitable despite advances in coatings that are applied to ships' hulls. From the moment the hull comes into contact with seawater, galvanic corrosion begins to occur on the surface of the hull due to flaws in the paintwork, pores and other factors that result in the formation of galvanic microcells on the steel of the hull. Part of these galvanic microcells becomes an anode area and the other part becomes a cathode area, creating a galvanic couple and thereby causing corrosion.
THE SOLUTION Cathelco's Impressed Current Cathodic Protection System constantly monitors the hull, detecting the appearance of corrosion. This monitoring is carried out by means of reference electrodes that are fitted to the hull, which measure the potential difference over the surface of the hull. When the potential difference indicates the beginning of a corrosion process, the system's computer activates the injection of an electrical current through the current injection anodes, which transmit it through the metal surface of the hull and the seawater itself. This current balances the potential difference to achieve the previous protection values, keeping the hull completely corrosion-free throughout its lifetime.
