Deepwater installs ICCP anode system to protect wind farms in the Irish Sea
Seven offshore wind turbines had prematurely failing cathodic protection anodes.
Deepwater developed a completely new type of impressed current anode system.
The VSE Anode
Deepwater was commissioned by the operator of the Arklow Field to develop an anode retrofit system for the seven mono-piles there with low cathodic protection readings. The system had to function in the 8 m -10 m water depth and had to utilize the power from the turbine to run. As there was no existing technology to fit the requirements, Deepwater developed the VSE anode system to scour and self-bury, creating a sea water envelope beneath the sea floor. Within the envelope, an MMO anode is kept free from mud contamination, allowing it to output the maximum cathodic protection current, regardless of the tide above. The VSA was also designed with a low profile to minimizes the risk of snagging by fishing activities while the system silts over.
All together, the retrofit cathodic protection (CP) system consisted of:
The VSE assemblies were installed 10 m to 15 m from the base of the monopiles. Dual-armored single-conductor cable was routed from the VSEs, across the bottom to the base of the monopiles and then up through specially-installed I-tubes to the rectifiers located at the (+) 13 m elevation. The systems, including I-Tubes, were installed on all seven monopiles in a total of eleven work days utilizing a dive support boat with lifting “A” frame. In addition, DR-2 CD polarization monitors were installed to monitor the performance of the new CP system.
A buried pocket of water
The VSE anode provides cathodic protection current to shallow water structures by creating a buried envelope of seawater.
VSE anodes are left on the sea floor to silt over in time.
The VSE anode is powered by a small rectifier located on the structure.
The VSE is easily handled by a small installation vessel and takes minimal time to complete the project.
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Project Case Study: Cathodic protection retrofit using impressed current anode sleds