RetroBuoy installed on the Neptune SPAR structure to supplement failing cathodic protection on the hull.
In August / September 2009, Deepwater Corrosion Services retrofitted the cathodic protection system on the Neptune Spar. The original cathodic protection system on the hull was approximately 300 sacrificial aluminum anodes. Neptune required a life extension significantly in excess of the original 15 year service life, including the cathodic protection (CP) system. At the request of the operator, DCSI designed, supplied and commissioned a 15-year life-extension impressed-current CP system (ICCP). The retrofit CP system consisted of:
• 2 x custom 500 Amp RetroBuoys with shear keys
• 2 x transformer rectifiers
• 6,660 plus feet of dynamic 7-conductor 3/0 AWG subsea power cable
• 2 x Polatrak DR 3 reference electrodes (installed at Neptune's keel during the cable pull-in)