Way Ahead In Corrosion Control

Retrosled

Aluminum anode sled for pipelines

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RetroSled™ allows operators to replace cathodic protection anodes on aging pipelines

The RetroSled™ is an aluminum anode sled designed for offshore pipeline life-extension projects. It's lowered onto the sea floor via crane and connected electrically to the pipeline with one or two RetroClamps.

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Connected with RetroClamp™

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Two armored cables connect the RetroSled™ to the RetroClamp™ mounted on the pipeline it will protect.

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The RetroClamp™ is patented technology, developed at Deepwater and not available anywhere else.

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The clamp is diver and ROV-friendly.

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The contact tip of the clamp that creates electrical contact with the pipeline can be fitted with a soft drill bit, allowing it to penetrate concrete weight coats.

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The floating plate on top of the clamp ensures a strong and constant connection that will not damage the pipe.

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Only one-third of a buried pipeline must be visible for a diver to install a RetroClamp™.

Offshore pipelines and risers

In shallow-water situations, a diver can quickly attach RetroClamps™ to a pipeline. Buried pipelines must be partially excavated. For deep-water applications, the ROV can install RetroClamps™ using an alternative fishtail handle.

The expanding sled is deployed closed and is opened via crane or ROV once on the seabed. It uses the same clamps for attachment as the rigid RetroSled™.

When a riser is electrically isolated from the rest of the platform, a RetroSled™ lead can be clamped to the desired section of the riser to provide protection.

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Deep 7Deep 10
Iron (Fe) 0.07 max Iron (Fe) 0.10 max
Silicon (Si) 0.10 max Silicon (Si) 0.10 max
Copper (Cu) 0.003 max Copper (Cu) 0.006 max
Zinc (Zn) 4.75 - 5.25 Zinc (Zn) 4.75 - 5.75
Indium (In) 0.015 - 0.025 Indium (In) 0.010 - 0.020
Titanium (Ti) 0.025 max Titanium (Ti) 0.025 max
Others (each) 0.02 max Others (each) 0.02 max
Aluminum (Al) remainder Aluminum (Al) remainder

Project Experience

Tabu, Guntong, Semangkok

Project case study: Anodes replaced during pipeline survey campaign

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

Forties field flowlines

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

  • Install time: 60 hours
  • Depth: 106 m

Alba Field

Project Case Study: Anode replacement on a pipeline in EG

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

Tubular Bells

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

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

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

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

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

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

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™

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

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

Tapis-F & Irong Barat B

Project case study: Anodes replaced on two Malaysian platforms

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

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

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

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

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

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

Houston Ship Channel dock

Project case study: Houston Ship Channel retrofit

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

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

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

TAQA North Cormorant

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

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

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

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

Frying Pan Tower

Project case study: Offshore bed and breakfast platform anode retrofit

  • Civilian owned
  • 12 RetroLinks™

Zafiro Producer

Project case study: Impressed current cathodic protection of FPSO hull

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

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

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

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

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

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

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

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

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

PanYu 30-1

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

  • Water depth: 200 m
  • Fixed monitoring

Kitchen Lights

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

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

Duncan Wharf

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

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

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

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

Dock Cathodic Protection

Anodes systems for Docks, Jetties and Piers

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

LAF-1 & 2 Platforms

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

  • Installation: ROV
  • Impressed current anodes

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

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

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

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

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

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

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

Dudgeon OWF

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

  • 4 offshore turbines
  • 32 km offshore

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

I-Rod® 28 years after installation

The cost of a bad pipe support

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