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'Diver Change' Anodes Simplify Replacement
01 May 2006
An FPSO conversion underway at the Keppel Shipyard in Singapore will be protected against hull corrosion using a Cathelco C-Shield ICCP system incorporating the latest 'diver change' anodes. The Capixaba is being converted from a VLLC tanker and will eventually be operated by Single Buoy Moorings in an oilfield off Brazil on a lease and operate basis.
To provide the optimum level of corrosion protection on the wetted surface of the 342m LOA hull, the Capixaba will be installed with an 800amp aft system and a 400amp forward system. Cathelco will be supplying linear loop anodes which provide a high output from a relatively small surface area.
The fewer anodes used, the fewer hull penetrations required.
Another important feature is that the anodes and reference cells are diver change, a design developed specially for vessels such as FPSOs which have long intervals between scheduled drydocking. Unlike normal anodes, which can only be changed at drydocking, these anodes can be changed from outside the hull by a diver, simplifying replacement and ensuring that the system is maintained at optimum performance.
The design uses an 'insert' embodied in the anode during manufacture which takes the place of conventional wiring.
In addition, a watertight sealing plate and sealing ring system has been developed to enable the transfer to take place easily.
MJInformation No: 21809
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