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RetroBuoy™
Impressed Current Cathodic Protection
for Life
Extension for Large Structures
by Deepwater Corrosion
Services
State-of-the-art
impressed current technology for offshore structures.
Modular sled based system for flexibility and ease of installation.
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RetroBuoy is a remote anode
system, ideally sitting approx 100 ft (30 m)
from the structure, producing excellent current
distribution. |
| Product Overview
RetroBuoy is the state-of-the-art
impressed current technology for offshore structures. The modular sled based
system couples design flexibility with ease of installation using diver or
ROV support. With a proven track record of success, the RetroBuoy system
redefines impressed current retrofit technology, saving hundreds of
thousands of dollars in CP retrofit costs on even modest retrofit programs.
The RetroBuoy system cuts retrofit costs by
delivering more cathodic protection, more efficiently with each installed
sled. One typical RetroBuoy sled can deliver up to 400 Amps of corrosion
protection – enough to protect 80,000 square feet of steel. The conventional
alternative protection would need 32 US tons of sacrificial aluminum.
Applications
- Offshore platform jacket retrofit.
- Very effective on multi-jacket
complexes, capable of protecting multiple structures.
- Spread-moored FPSOs.
- Large dock structures.
Main Benefits
- The lowest installed cost in the
industry. Installation cost drives offshore CP retrofit budgets: install
a single RetroBuoy sled or 48 pairs of sacrificial anodes weighing 500kg
each.
- Being a remote system, current
distribution is optimized, and potential levels are maintained within a
tight range over the whole structure.
- Exhaustive attention has been given to
every design detail; RetroBuoy is modular and redundantly designed.
- The design allows the system to be
quickly customized to provide sled current capacities from 250-500
Amperes for 15-25 year design life. It also allows us to provide prompt
delivery – typically 4-6 weeks from order.
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Buoyant anode transport allows system
to operate at optimum current levels. |
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Two 400 Amp units prior to deployment. |
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Available integral cable deployment hopper
can simplify installation. |
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| RetroBuoy
installed on bottom. |
RetroBuoy
during float deployment. |
All four
anode floats deployed. |
| Anode Elements:
Mixed metal oxide (MMO) activated titanium tubular 1.25”
x 48” (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/ft3 (0.4485
g/cm3) with depth rating of 1000 f.s.w. (305
meters). Three or four buoyancy modules provided
depending on required life and current. Overall
dimensions: 12” diameter x 72” long (305 x 1829 mm). |
| Main Feed Cables:
4/0 A WG (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). |
| 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 CP 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 m). |
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