RetroBuoy™
Impressed current cathodic protection system for large structures

Model Name	Anodes Modules	Current Rating (A)	Anode to Structure*	Anode to Sea floor	Applications
1. RetroBuoy Jr	1	150/200	3m(10ft)	0.7m (2.3ft)	Docks and harbors, small offshore structures, jacket complexes, in tropical oceanic conditions
2. RetroBuoy Mk3	4	300/400	25m(80ft)	1.5m (5ft)	Large offshore structures in tropical oceanic conditions, with a stable sea floor
3. Retrobuoy (RB-4)	4	400/500	30m(100ft)	2.1m (7ft)	Large offshore structures in harsh oceanic conditions, with an unstable sea floor

Model 1: RetroBuoy Jr.

Anode Elements: Mixed metal oxide (MMO) activated titanium tubular 1.25 in x 48 in (31.75 x 1219 mm) – center compression connected. Anodes triple coated. Number of rods will vary between 2 and 4 depending on required life and current.

Buoyancy Modules: Tri-part syntactic foam 28 lb/ft3 (0.4485 g/cm3) – Depth rating 1000 f.s.w. (305 meters). One buoyancy module provided. Overall dimensions: 12 in Ø x 72 in long (305 x 1829 mm).

Main Feed Cables: 4/0 AWG (approx. 120 mm2), HMWPE insulated & bedded, contra-helical double galvanized steel wire armor package, HMWPE overall jacket. Two or three cables will be provided depending on required life and current (Note – Cable specified is for fixed jacket applications only - specs may vary from project to project).

Cable Connections: Made inside an oil filled, pressure compensated junction box. Each anode element is on a separate parallel circuit. Note: new model of RetroBuoy with concrete gravity base do not require the fluid filled connection box.

Tethers: Braided stainless steel.

Frame: Welded steel construction, coated and provided with sacrificial anode CP for required life.

Stabilization: Depending on bottom conditions, the sled may be additionally stabilized with concrete articulated mattresses. For specifications on this mattress, please contact us.

Model 2: RetroBuoy (Mk 3) for moderate conditions (largely discontinued)

Anode Elements: Mixed metal oxide (MMO) activated titanium tubular 1.25 in x 48 in (31.75 x 1219 mm) – center compression connected. Anodes triple coated. Number of rods will vary between 6 and 32 depending on required life and current.

Buoyancy Modules: Tri-part syntactic foam 28 lb./ft.3 (0.4485 g/cm3) – Depth rating 1000 f.s.w. (305 meters). Three or four buoyancy modules provided depending on required life and current. Overall dimensions: 12 in Ø x 72 in long (305 x 1829 mm).

Main Feed Cables: 4/0 AWG (approx. 120 mm2), HMWPE insulated & bedded, contra-helical double galvanized steel wire armor package, HMWPE overall jacket. Two or three cables will be provided depending on required life and current (Note – Cable specified is for fixed jacket applications only - specs may vary from project to project).

Cable Connections: Made inside an oil-filled, pressure compensated junction box. Each anode element is on a separate parallel circuit.

Tethers: Braided stainless steel. Frame & Cable Hopper: Welded steel construction, coated and provided with sacrificial anode cathodic protection for required life.

Power Supply: Transformer rectifier DC voltage is normally maintained to 24V, but may have to increase to either 36V or 48V for current ratings above 400 Amps or water depth over 250 ft (76 meters).

Model 3: RetroBuoy RB-4

Anode Elements: Mixed metal oxide (MMO) activated titanium tubular 1.25 in x 48 in (31.75 x 1219 mm) – center compression connected. Anodes triple coated. Each RetroBuoy MkIV has 4 buoyancy modules each containing 3 MMO tubes (12 Total per RetroBuoy Mk IV).

Buoyancy Modules: PE injection molded shell / vacuum filled syntactic foam 36 lb./ft.3 (576 kg/m3) – Depth rating 1000 f.s.w. (305 meters). Four buoyancy modules provided per RetroBuoy MkIV. Overall dimensions: 12.75 in Ø x 60 in long (325 x 1524 mm).

Main Feed Cables: Varies depending on project requirements.

Cable Connections: Made inside an oil-filled, pressure compensated junction box. Each anode element is on a separate parallel circuit

Tethers: 1" Plasma 12 strand synthetic rope.

Frame: Welded steel construction (Grade ASTM A36 or A53), coated and provided with sacrificial anode cathodic protection for required life.