Protection Systems

The Problem of Corrosion Corrosion takes many forms in the marine environment. It can be seen as pitting on hull plates; in the disintegration of weld seams; around bow thrusters and on the surfaces of rudders and other vital components. A well designed ICCP system can eliminate these problems, safeguarding the structural integrity of the vessel and significantly reducing maintenance costs throughout its operational life. By installing a Cathelco system you can have the advantage of world leading ICCP technology combined with the expertise which goes with wide understanding of corrosion problems...

Cathelco ICCP systems for vessels of every type Cathelco C-Shield impressed current cathodic protection (ICCP) systems have now been fitted to more than 10,000 vessels around the world, establishing a record of effective performance and reliability on ships of every type: Cruise Ships Container Vessels VLCCs Ferries FPSOs Ice Class Vessels The systems continue to advance through the introduction of a wider range of control panels. These take advantage of the latest advances in technology to provide systems which are not only effective, but economical to install. Cathelco have also developed an...

Impressed Current Cathodic Protection Systems RUDDER BONDING REFERENCE CELL LINEAR LOOP ANODE REMOTE MONITORING UNIT SHAFT EARTHING ASSEMBLY CONTROL PANEL Linear Loop Anodes Circular Anodes Elliptical Anodes Produce a powerful output from a relatively small surface area. Lightweight and easy to install. Ideally suited to vessels where a smooth hull profile is required. Can be flush mounted in areas where space is limited. The elliptical shape enhances current distribution. Provides the flexibility to fit into complex hull profiles.

Most operators recognise the need to combine modern hull coatings with a purpose designed impressed current cathodic protection system. The C-Shield system suppresses corrosion on the wetted surface of the hull using an arrangement of hull mounted anodes and reference cells connected to a control panel. This neutralises ‘corrosion cells’ and eliminates problems that arise through dissimilar metals and the proximity of components such as propellers. CONTROL PANEL ELLIPTICAL ANODE REFERENCE CELL Diver Change Anodes Reference Cell Can be changed from the outside of the hull by a diver. Ideal for...

Thyristor Panels C-Shield thyristor control panels combine cost effectiveness with rugged reliability that has been proved on vessels of all sizes They also Incorporate the latest computerised Information systems enabling the status of the ICCP system to be monitored by ships' Thyristor control panels can be used for systems of up to 1,000 amps with 8 anodes and 4 reference cells being controlled by an Individual panel. They are Ideal for the requirements of cruise ships, VLCCs and many types of container and cargo vessels. The popularity of these panels means that they can generally supplied...

C-Shield - the savings Additional fuel consumption – Sacs vs ICCP 500 .00 0 375 2. 250 .00 Costings based on data for increased drag contained in BS CP1021 0 .00 3. Escalation: 3% pa compound 0 125 .00 10 BS AC AS AC 8Y ear 0 Cost in US Dollars Notes 1. Ship Types: A - 25,000 dwt General Cargo B - 150,000 dwt Bulk Carrier Yea rs s 4Y ear s 2Y ear s In contrast C-Shield anodes last for many years and achieve a more much reliable level of protection without the extra weight or drag which is inevitably associated with sacrificial methods. Capital cost comparison for equipment installed Notes 1....

Shaft Earthing Even on ships fitted with ICCP or sacrificial anode systems, propeller shaft bearings are vulnerable to corrosion. This is because turning propeller shafts are electrically insulated from the hull by the lubricating oil film in the bearings and by the use of non-metallic bearing materials in the tail shaft. The problem can be eliminated if the shaft is earthed to the hull using a propeller shaft slipring. Cathelco supply complete shaft earthing assemblies consisting of a pair of high silver content/graphite compound brushes mounted in a balanced brush holder, running on a copper...

Anode 3 Anode 1 Top Anode 1 Stbd. Stern Ref 2 Ref 1 Port Bow Anode 2 REF Electrode Bottom Anode 4 Anode 2 Large Thruster Tunnel ICCP Systems Bow and stern thruster protection is a specialised area where Cathelco have developed a system which is uniquely effective in providing corrosion protection. The Star Ismene is fitted with bow and stern thruster tunnel ICCP Systems Problems of corrosion arise because of the dissimilarity of the materials used in the hull and thruster tunnel construction and remain unchecked because they are outside the scope of conventional ICCP systems. Cathelco’s thruster...

A system specifically designed to protect your ship against corrosion System Design Quality Approvals C-Shield systems are specifically designed for the particular requirements of individual vessels and their operating conditions. They can be installed at newbuilding or retrofitted to existing tonnage during scheduled drydocking. The manufacture of C-Shield systems conforms to the highest standards of quality. With comprehensive experience of ICCP system design and the factors which influence hull corrosion, Cathelco’s engineers will formulate the most effective arrangement of hull anodes, reference...

Easier installation The installation of C-Shield systems follows well established principles which have been approved by all of the leading classification societies. Depending on the type of anodes being fitted, work begins by cutting holes in the hull to accommodate bosses or doubler plates. These are welded in position ready to receive cofferdams, enabling watertight electrical connections to be made to the anode. Elliptical anode being fitted Di-electric shield surrounding elliptical anode For surface mounted anodes, a mounting plate or mounting studs are welded to the exterior hull surface...