[balboa]

Does anybody have experience with vessels replacing their zinc anode protection with a so-called 'impressed current cathotic protection" system, Like those made by for instance www.cathelco.com?

And can anybody give feedback on their experience with pipework antifouling/corrosion suppresion systems?

I'm not talking about something like Barnacle clear that uses sonic vibration which only works on smaller yachts with up to 1/4" plate material.

And feedback would be greatly appreciated.

Thorwald

[Northern Lights]

Electroguard and Capac Englehard Industries both make impressed systems. Titanium anodes that are serviced at 10-15 year periods are the source of protective current. Electroguard corrosion control systems and electroguard zinc are not the same company.

[The Reverend]

I have used both Cathelco and Marelco systems in the past on yachts of 60 -75 Meters and the experience has been very good. In one case we retrofitted system as we were having fouling problems on the main sea chest, the results were amazing a pipe that had been regularly choked remained clear.
These systems do not replace traditional zincs altogether however they are great at keeping clear areas where there is a constant flow (and therefore fouling problems) ie A.C. seawater intakes. Generally they are mounted in pairs one copper and one zinc alloy they are connected to a central control panel in the engine room.
The anodes are bolted through the hull with a single stud replacing them is a bi-annual drydock job. I have changed one damaged anode whilst in the water using a diver however it´s not to be recommended.