Way Ahead In Corrosion Control

RetroBuoy

Impressed current cathodic protection (ICCP) anode system for large structures

The most efficient and environmentally responsible cathodic protection retrofit system available

RetroBuoy™ is a high-capacity impressed-current cathodic protection system, designed primarily as a retrofit for existing structures. It utilizes impressed-current titanium-anode rods housed in buoyant floats. This configuration keeps the anodes in constant contact with seawater, maximizing the efficiency of the cathodic protection.

 

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RetroBuoy™ overview

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Current output

Each RetroBuoy™ can put out up to 500 amps of cathodic protection current, enough to protect 80,000 sq. ft of steel.

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Anode floats

Each anode float contains three mixed-metal oxide anodes.

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Transformer rectifier

Each RetroBuoy™ is powered by a TR on the surface.

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Cable

Depending on the particular installation, different cable specs are used. All cables are double-armored single conductors. Cable management through the splash zone is a critical aspect of platform retrofits. J-tubes or I-tubes can be used. Dynamic cable can be configured in a lazy S for FPSO installations.

RetroBuoy™ introduction

Key design factors

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Superior efficiency

Mixed-metal-oxide-activated titanium electrodes allow the anode sled to be operated at a very high current output. Installing the electrode elements in buoyant modules ensures that they remain surrounded by clean seawater.

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Compact protection

The RetroBuoy's sled base is compact and easily handled by most offshore installation vessels.

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Customizable cabling

Routing the ICCP system cable can be done in a variety of ways depending on project needs. Our partnerships with key transformer / rectifier manufacturers in the US and UK allow us to provide complete systems in compliance with any local electrical requirements and safety codes.

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Durable design

The oil-filled, pressure-compensated electrical junction box that houses the electrode cables allows the system to operate efficiently at any depth. 

Very cost efficient

RetroBuoy™ provides the lowest installed cost per ampere/year of any CP system available.

To maintain appropriate levels of protection, individual RetroBuoy™ anode sleds can be rated anywhere from 150 to 500 amps.

The compact size and remote location of the RetroBuoy™ on the seabed simplifies the installation procedure and increases the cost-effectiveness of the retrofit.

These installation costs typically dominate a large offshore cathodic protection upgrade and the RetroBuoy™ eliminates most superfluous work.

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RetroBuoy™ installation

Project Experience

GOM structures

Project case study: Cathodic protection retrofit on five structures in fourteen days

  • 5 fixed jackets
  • Install time: 14 days
  • 210' four point boat

LAF-1 & 2 Platforms

Project case study: Single float RetroBuoy™ systems installed in the Gulf of Guinea.

  • Installation: ROV
  • Impressed current anodes

TAQA North Cormorant

Impressed Current Cathodic Protection (ICCP) retrofit on the North Cormorant Platform

  • Fixed platforms
  • Installation: ROV
  • Install time: 18 hrs

Ewing Bank 305-A

Project case study: Two large impressed-current anode sleds installed on a GOM platform

  • Water depth: 300 ft
  • 20 year life extension
  • 800 Amps of CP current

BARD Offshore 1 OSS retrofit

Project case study: RetroBuoy™ ICCP anode system for an OSS transformer platform

  • Platform installed 2010
  • Premature anode failure
  • 25-year design life

Arnold / Oyster fields

Project case study: Anode retrofit on two deep-water subsea fields in the Gulf of Mexico

  • Installation: ROV
  • Install time: 72 hours
  • Depth: 775 ft / 1,750 ft

Offshore wind farm

Project case study: ICCP anode sled to supplement failing anodes on 33 wind turbines

  • Field: 33 tripod turbines
  • Install: < 24 hrs / turbine

Olympus Field PBGs

Project case study: Self-monitored anode sled protects 24 new PGBs at 3,000 ft for 45 years.

  • Installation: ROV
  • Install time: 30 hours
  • Battery-free monitoring
  • 45-year design life

Dana Triton FPSO retrofit

Project case study: Hanging ICCP anode system installed to protect the hull of a floating storage vessel

  • Installation: Topside
  • Unit is storm-recoverable
  • Remote O&M

Enterprise dock anodes

SACP retrofit of dock structure and pilings in Beaumont, Texas

  • Sections of dock, dolphins and piles had insufficient CP
  • Anodes added to supplement existing land-side ICCP
  • Continuity cables added to discontinuous sections

Zafiro Producer

Project case study: Impressed current cathodic protection of FPSO hull

  • Water depth: 590 ft
  • Dynamic cable
  • 800 Amps CP

Neptune Spar

Project Case Study: ICCP anode sled to supplement failing anodes on the hull

  • INSTALL TIME: 72 HOURS
  • DEPTH: 1,930 FT
  • 15 YEAR DESIGN LIFE

Case study: Sendje Ceiba FPSO outfitted with RetroBuoy™ ICCP sled

Project case study: RetroBuoy™ ICCP anode system installed to protect the hull of a floating storage vessel

  • Up to 500 amps for 20 years
  • Initial current required: 190 amps
  • Final current required: 404 amps

Leman Alpha

Project case study: ICCP anode sled to supplement failing anodes on three structures

  • Install: 12 hours per buoy
  • Depth: 35 M
  • 25-year design life

Garden Banks 191 A

Project case study: ICCP anode sleds retrofit on a GOM fixed platform

  • Water depth: 720 ft
  • Installation: ROV
  • Install time: 2 days

Forties Field platforms

Project case study: Nine RetroBuoy™ systems installed to protect four aging North Sea structures.

  • 4 fixed platforms
  • 9 x 450 Amp sleds
  • Install: 12 hours each
  • 20-year design life

South Pass 62-C

Project case study: Two RetroBuoy™ systems replace spent anodes on a 330 ft platform in the Gulf of Mexico

  • Install time: 30 hours
  • Depth: 330 ft
  • 20 YEAR DESIGN LIFE

PanYu 30-1

Project case study: ICCP anode retrofit for eight-leg structure in the South China Sea

  • Water depth: 200 m
  • Fixed monitoring

Lufeng 13-2

Project case study: Two RetroBuoy™ systems for a fixed platform in the South China Sea

  • Platform installed 2005
  • Premature anode failure
  • Depth: 430 ft
  • Supplemental ICCP anodes

6 Bay Marchand platforms

Project case study: Anode retrofit of 6 Bay Marchand platforms

  • 6 structures
  • 61 anode strings
  • 5 year life extension

Ship Shoal structures

Project case study: RetroLink™ anode strings on shallow-water assets in the Gulf of Mexico

  • 64 RetroLinks™
  • 25 structures

Joliet TLP

Project case study: Anode retrofit for the foundation template of a TLWP in Green Canyon

  • Water depth: 1,760 ft
  • 19 x RetroPods™

Duncan Wharf

Project case study: Cathodic protection retrofit using impressed current anode sleds

  • Semi-Arctic temperatures
  • 3,700 AMPS of CP

Dock Cathodic Protection

Anodes systems for Docks, Jetties and Piers

Frying Pan Tower

Project case study: Offshore bed and breakfast platform anode retrofit

  • Civilian owned
  • 12 RetroLinks™

Ras Gharib platform

Project case study: Retrofit anode sleds for a fixed platform in the Red Sea

  • Install: Divers
  • Install time: 24 hours
  • Depth: 14 m
  • As left: (-)1.050V vs Ag/AgCl

ERWB Jackets

Project case study: Seabed anode sleds retrofit CP on Gulf of Thailand platforms

  • Bridge-connected jackets
  • Water depth: 200 ft
  • Install time: 60 hours
  • Seabed anodes only

Liverpool Bay OSI

Project case study: Hanging ICCP anode system installed to protect the hull of a floating storage vessel

  • Installation: Topside
  • Offshore time: 4 days
  • Unit is storm-recoverable
  • 10 year life extension

Kitchen Lights

Project case study: ICCP anode system for a new platform in Alaska

  • New fixed jacket
  • Cook Inlet, Alaska
  • Impressed current

Houston Ship Channel dock

Project case study: Houston Ship Channel retrofit

  • 5 docks protected
  • Installation: Divers
  • 47 RetroLinks™ installed
  • 16 ICCP anodes installed

Eugene Island 295-A

Project case study: Spent platform anodes replaced with subsea anode strings by divers

  • Installation: Divers
  • Install time: 60 hours
  • Depth: 220 ft

Black Bay platforms

Project case study: Anode strings retrofit on 69 structures in Black Bay, Gulf of Mexico

  • 115 anode strings
  • 22 continuity jumpers
  • Structures: 69
  • Offshore time: 22 days

Montara CP test stations

Montara Pipeline fitted with CP test stations

  • Wellhead trees and PLET needed electrical continuity
  • Piggybacks on flowlines lacked continuity
  • Tiebacks were used to ensure electrical continuity
  • RetroClamp™ CP test stations were added

Tapis-F & Irong Barat B

Project case study: Anodes replaced on two Malaysian platforms

  • Fixed platforms
  • Installation: ROV
  • Install time: 63 hrs

Tubular Bells

Project case study: Anode retrofit for production pipelines in Mississippi Canyon

  • Water depth: 4,500 ft
  • Installation: ROV

Tabu, Guntong, Semangkok

Project case study: Anodes replaced during pipeline survey campaign

  • 3 pipelines
  • Installation: ROV
  • Install time: 4 days

Green Canyon

Project case study: Anode sleds installed at Neptune and Shenzi fields

  • Water depth: 4,400 ft
  • Install time: 3 days

Brent pipeline

Project case study: Pipeline anode retrofit with mattresses

  • 12 km pipeline
  • Conctrete weight coat
  • 15 year life extension

Forties field flowlines

Project Case Study: Anode retrofit for the in-field flowlines in the North Sea

  • Install time: 60 hours
  • Depth: 106 m

Cook Inlet Pier

Project case study: Deepwater designs and installs new impressed current pile anode in Alaska.

  • 1,800 AMPS of CP
  • Freeze / thaw resistant

Bahamas loading dock

Project case study: Failing dock anodes replaces with topside anode strings

  • Sacrificial anodes
  • Diverless install

Alba Field

Project Case Study: Anode replacement on a pipeline in EG

  • Installation: ROV
  • Depth: 200 ft
  • Sacrificial anode sled

Sheringham Shoal anode strings

RetroLink™ anode string tested on wind farm monopile

  • Inadequate CP on external sections of pile
  • Retrofit couldn't use divers or welding
  • RetroLinks™ attached to custom clamps
  • Current monitoring and reference electrodes added

Arklow Bank

Project case study: ICCP anode system for wind farms in the Irish Sea

  • 7 x wind turbines
  • Water depth: 10 m
  • Offshore time: 11 days

Pipeline Excavation Tool (PET™) installs RetroClamp™

Excavation of shallow buried underwater pipeline near Grand Isle, LA

  • Entire operation done from topside - no divers
  • Took two hours to excavate and install RetroClamp™
  • Whole operation including setup and demob took one day

Gunfleet Sands wind farm anodes

38 monopiles retrofit in Gunfleet Sands

  • 38 monopiles retrofitted in Gunfleet Sands
  • Monitoring added to 6 Gunfleet Sands monopiles
  • Monopile in Lincs gets CP retrofit and monitoring

The cost of a bad pipe support

I-Rod® 28 years after installation

24 inch methanol pipeline

Project case study: RetroMat™ anode sleds installed on the Atlantic methanol pipeline in EG

  • Local assembly
  • Offshore time: 3 days
  • Length: 2 km
  • As left: -1.025V vs Ag/AgC

8 inch pipeline

Project case study: RetroLink™ anode strings used to retrofit cathodic protection on 8 inch pipeline

  • Installation: Divers
  • Offshore time: 30 hours
  • Length: 4.5 km
  • As left: -0.998V vs Ag/AgCl

LINCS wind farm monitoring

Monitoring systems for wind monopiles

  • Wind monopiles without internal coating or CP
  • Long-term monitoring on sampling of structures
  • Corrosion coupons measure wall loss over time
  • Electrical resistance system logs data

Shenzi subsea tree

Project case study: SunStation CP monitoring system interrogated by ROV at 4,300 ft

  • Water depth: 4,300 ft
  • 25-year monitoring system
  • No batteries required

Chinook Field PLET

Project case study: Deepwater designs a mini-gateway retrofit in the Gulf of Mexico

  • Continuity jumper
  • Borrowed CP from PLET
  • Custom design
  • 2 week turnaround

Dudgeon OWF

Project case study: Remote cathodic protection monitoring system installed in the North Sea

  • 4 offshore turbines
  • 32 km offshore

California wave park survey

Project case study: California wave park corrosion survey

  • CVI/NDT inspection Done
  • 500,000 sq. ft. + facility
  • 55+ assets Inspected
  • ICCP retrofit recommended

Offshore drill stack

Project case study: CP levels monitored and corrected

  • Recap Datalogger
  • CP & Coating Remediation

Hydrogen Embrittlement Study

Project Case Study: Hydrogen Embrittlement Study

Model name Anodes modules                   Current rating (A)                   Anode to structure*                   Anode to sea floor                   Applications                                    
RetroBuoy Junior 1 150/200 3m(10ft) 0.7m (2.3ft) Docks and harbors, small offshore structures, jacket complexes, in tropical oceanic conditions
Retrobuoy (RB-4) 4 400/500 30m(100ft) 2.1m (7ft) Large offshore structures in harsh oceanic conditions with an unstable sea floor

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