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RetroBuoy Jr™
Impressed Current Cathodic Protection
for Life
Extension for Smaller Structures
by Deepwater Corrosion
Services
State-of-the-art
impressed current technology for smaller structures,
docks and jetties. Compact size for installation from small vessels.
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RetroBuoy Jr. in situ,
protecting a pier structure.
The semi-remote location maximizes current. |
| Product Overview
RetroBuoy Jr. is a smaller, more compact
version of Deepwater’s standard RetroBuoy™. Where the RetroBuoy’s 400 Amp
output capability makes it ideal for large structures and FPSO’s, the
RetroBuoy Jr.’s 200 Amp output makes it ideal for smaller structures, docks,
and jetties.
RetroBuoy Jr. has a single buoyancy module
that can be equipped with anode rods to provide current ratings from 100 to
200 Amperes for up to a 20-year design life, depending on the needs of the
asset to be protected.
The compact size facilitates installation
from small support vessels, making the system ideal for inshore dock and
jetty type applications, as well as bridge-connected offshore platform
complexes with power.
RetroBuoy systems cut retrofit costs by
delivering more cathodic protection, more efficiently. One typical RetroBuoy
Jr. sled can protect up to 40,000 square feet of steel. The conventional
alternative protection would need 16 tons (US)
of sacrificial aluminum.
Applications
- Offshore platform jacket retrofit.
- Docks, Jetties, piers, and other
in-shore structures.
- Small structures with power.
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When installed on a fixed
structure, RetroBuoy Jr. sits on bottom inside or outside of the jacket |
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Main Benefits |
The cable to the rectifier on
the surface is secured to the member by a variety of available clamping and
strapping mechanisms. |
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- A 150 Ampere sled,
as shown, replaces approximately 12 tons of aluminum
anodes and will protect a typical 4 pile jacket in
100 feet of seawater.
- The compact size
lends itself well to semi-remote installation inside
or close to the jacket structure.
- Installation is a
snap; one day is typically all that is required.
- The buoyant anode
concept lets the anode elements stay in seawater
where they can operate at maximum efficiency, the
free floating module works with the environment,
providing long term reliability.
Specifications
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| 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 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 modules provided. 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: 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. |
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