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Cathodic Protection Design

Cathodic protection design for new and aging offshore and marine assets





Cathodic-protection design services and third party review from NACE certified engineers.

In addition to new designs according to NACE, ISO and DNV standards for traditional assets, Deepwater specializes in complex subsea equipment and designing retrofit anode systems for aging assets in need of life extension. 

CP Design codes for new assets

Platforms and Floaters

New platforms, TLPs and floating production equipment are all designed to one of the established design codes:

> DNV-RP-B401 

> NACE SP0176-2007

> ISO 19906

Pipelines

Anode system design for new pipelines also is strictly governed by industry-accepted design codes:

> DNV RP-F103

> ISO 15589-2

> NACE SP0169-2007

Deep water equipment

For subsea production equipment or anything else in deep water, the existing standards are modified by the following:

> NACE 7L192

Project experience

Kitchen Lights

Project Case Study: ICCP anode system for a new platform in Alaska

  • New Fixed Jacket
  • Cook Inlet, Alaska
  • Impressed current

PanYu 30-1

Project Case Study: ICCP anode retrofit for eight-leg structure in the South China Sea

  • Water depth: 200 m
  • Fixed monitoring

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

Green Canyon

Project Case Study: Anode sleds installed at Neptune and Shenzi fields

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

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

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

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

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

Zafiro Producer

Project Case Study: Impressed Current cathodic protection of FPSO Hull

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

Brent Pipeline

Project Case Study: Pipeline anode retrofit with matresses

  • 12 km pipeline
  • Conctrete Weight Coat
  • 15 year life extension

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.

  • 1800 AMPS of CP
  • Freeze / Thaw resistant

Offshore Drill Stack

Project Case Study: CP levels monitored and corrected

  • Recap Datalogger
  • CP & Coating Remediation

TAQA North Cormorant

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

  • Fixed Platforms
  • INSTALLATION: ROV
  • INSTALL TIME: 18 hrs

Tapis-F & Irong Barat B

Project Case Study: anodes replaced on two Malaysian platforms

  • Fixed Platforms
  • INSTALLATION: ROV
  • INSTALL TIME: 63 hrs

Tabu, Guntong, Semangkok

Project Case Study: anodes replaced during pipeline survey campaign

  • 3 PIPELINES
  • INSTALLATION: ROV
  • INSTALL TIME: 4 DAYS

Frying Pan Tower

Project Case Study: Offshore Bed and Breakfast platform anode retrofit

  • Civilian owned
  • 12 Retrolinks

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

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

Dudgeon OWF

Project Case Study: Remote Cathodic Protection Monitoring System Installed in the North Sea

  • 4 Offshore Turbines
  • 32 km Offshore

Olympus Field PBGs

Project Case Study: Self-monitored anode sled protects 24 new PGBS at 3000 ft for 45 years.

  • INSTALLATION: ROV
  • INSTALL TIME: 30 HOURS
  • BATTERY-FREE MONITORING
  • 45 YEAR DESIGN LIFE

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

Forties field flowlines

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

  • INSTALL TIME: 60 HOURS
  • Depth: 106 m

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

Arklow Field

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

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 istalled to protect the hull of a floating storage vessel

  • Installaion: Topside
  • Offshore time: 4 days
  • Unit is Storm-recoverable
  • 10 year life extension

6 Bay Marchand Platforms

Project Case Study: Anode Retrofit of 6 Bay Marchand Platforms

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

Tubular Bells

Project Case Study: Anode retrofit for production pipelines in Mississippi Canyon

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

Ship Shoal Structures

Project Case Study: RetroLink anode strings on shallow-water assets in the Gulf of Mexico

  • 64 RetroLinks
  • 25 Structures

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

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

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

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

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

Ras Gharib Platform

Project Case Study: Retrofit anode sleds or 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

Duncan Wharf

Project Case Study: Cathodic protection retrofit using impressed current anode sleds

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

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