Marine Anti-Fouling (AF) System by Cathelco Ltd

The advantage of strainer mounted systems is that the anodes can be changed at any time without the need for dry docking.

Description

The systems consist of pairs of copper and aluminum anodes mounted into the sea chests or strainers. In operation, the copper anodes produce ions which are carried by the flow of seawater, creating a environment which barnacles or muscles will not settle or multiply.

This action is assisted by aluminum hydroxide created by the aluminum anodes. The copper and aluminum hydroxide floc is carried throughout the system and tends to spread out in slower moving areas where marine larvae are most likely to settle.

As a result, marine growth larvae pass directly to the discharge. At the same time, a cupro-aluminum film is built up on the internal surfaces of the pipes to suppress corrosion. The seawater cooling system is protected against bio-fouling and corrosion.

Components

Anti-Fouling Anodes



Control Panels


Cathelco Ltd has developed a range of control panels for vessels of every size. Control panels can be fitted in the engine room or any other convenient area where they can be viewed by crew members. These control panels provide an impressed electrical current to the anodes and are designed with digital displays which enable the system’s status to be immediately monitored. Apart from these checks, the equipment is completely automatic and makes very little demand on crew time.


Seachest Mounted Anodes

Copper and aluminium anodes can be mounted in seachests if the scheduled drydocking period for the FPSO is less than 5 years, assuming there is sufficient space availability.

 

Strainer Mounted Anodes

The advantage of strainer mounted systems is that the anodes can be changed at any time without the need for drydocking. In these circumstances, Cathelco Ltd. recommend that some of the treated water is fed back to the seachests to ensure thatthey are kept free from fouling.

 


 

 


If the drydocking interval is greater than 5 years, an electrolysis tank system may be the most practical option. In this case, a feed is taken from one of the seachests and pumped to the electrolysis tank housing the copper and aluminum anodes. The seawater is treated at a high dosage rate and then distributed via pipework to multiple seachests where it is diluted by the incoming flow and achieves a normal dosage rate to protect against bio-fouling.

  • Effective and reliable anti-fouling protection.

  • Automatic – requires minimal attention.

  • Does not involve the use of chemicals.

  • Environmentally friendly.


Box Cooler Mounted Anodes



Cathelco Ltd systems for larger ships are often designed with multiple anode installations to protect high and low sea chests or strainers. The size of the anodes is determined by the flow rates and their anticipated design life or dry docking intervals.

Please complete the AF vessel questionnaire to accompany the RFQ for a detailed quotation. 

Cathelco offers smaller AF systems for ferries, tugs, workboats, fishing vessels, and yachts. The systems can be installed to soley provide anti-fouling protection or as a dual-purpose system with corrosion suppression anodes.

Please complete the AF vessel questionnaire to accompany the RFQ for a detailed quotation. 

Cathelco Ltd. pump protection anti-fouling units are designed to be mounted at the bottom of pumps, often inside the stilling tube or caisson. These marine growth prevention systems consist of special copper and aluminum anodes housed within a steel framework and fed with an electrical current from a transformer / rectifier. The anode mounting frame acts as the cathode, creating a completely self-contained unit, which is electrically isolated from the pump using a specially designed isolation kit.

Please complete the AF vessel questionnaire to accompany the RFQ for a detailed quotation