Cathodic protection design

Tamar Field

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

Riser base CP modeling

Modeling used to verify 15-year life extension

• Developed 3D CAD model of asset
• Used existing CP survey data
• 15-year life extension

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

Offshore drill stack

Project case study: CP levels monitored and corrected

• Recap Datalogger
• CP & Coating Remediation

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

Brent pipeline

Project case study: Pipeline anode retrofit with mattresses

• 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.

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

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

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

Dock Cathodic Protection

Anodes systems for Docks, Jetties and Piers

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

CP simulation on an offshore platform

CP modeling was used to provide depolarization timeline

• Inspection CP data used
• 3D CAD model used
• North Sea simulation

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

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

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

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™

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 3,000 ft for 45 years.

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

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

Port of Alaska dock

Cathodic protection retrofit for beams

• 8 Raparound™ anodes used
• Divers secured anodes and routed cables

Who Dat retrofit with suspended ICCP anodes

Semi-submersible rig needed short-term CP

• Most existing ICCP anodes had failed
• Suspended anode chosen as fastest, lowest-cost option
• Existing transformer/rectifier used
• Suspended anode is tethered to prevent damage

RetroLink™ anode strings installed

Apache’s EC-2-C 4-pile structure in the Gulf of Mexico

• Six RetroLink™ anode strings installed
• Depth: 30 feet of water
• Located in Gulf of Mexico
• Total time - including travel - 6 hours

CP jumper system installed on pipeline

Jumper system provides CP bridge across insulator joint

• Two 12” RetroClamps™ were installed
• Pair of 4/0 cables provide continuity
• ROV installation

RetroLinks™ installed on multiple assets

Chevron needed CP retrofits on smaller Gulf of Mexico structures

• A total of five RetroLinks™ installed
• Platforms, wellheads and pipeline risers
• Assets spread over various fields

RetroLinks™ installed on Chevron East platform

23 RetroLink™ anode strings were attached

• RetroLinks™ were attached to 23 horizontal stand-offs
• Caisson structure in 48 feet of seawater
• Two Vamp Clamps™ used for electrical continuity
• 1.5 hours average installation time per anode string

Retrolinks™ installed on three platforms

Arenque A, B and C get CP retrofits

• 20 Retrolinks™ used per structure
• Retrolinks™ were 200 feet in length
• Protected for at least 5 years

RetroLinks™ installed on smaller Gulf of Mexico structure

Quarter North Energy’s SS-80A

• RetroLink™ anode strings installed
• RetroLinks attached to stand-offs welded to structure
• Smaller structure in Gulf of Mexico
• Water depth: 25 feet

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

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

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

Galveston Island Historic Pleasure Pier retrofit

47 RetroLink™ anode strings installed

• RetroLink™ anode strings installed
• Anode strings attached with RetroClamps™
• CP levels verified using Polatrak ®CP Gun™

RetroPods™ installed on wellheads and SUTA

Three anode sleds protect subsea equipment

• RetroPod™ anode sleds installed
• RetroClamps™ provide electrical connection

Four platforms retrofit near Trinidad

59 anode sleds, 3 clamp-on anodes used

• 59 anode sleds were required
• 3 Dual-anode clamp-ons were used
• Smaller booster anodes added to top of sleds
• Systems were connected via RetroClamps™

RetroLinks™ installed on Boardwalk Pipeline

Retrofit of shallow pipeline in swamp with RetroLinks™ and RetroClamps™

• 490 feet of RetroLinks™ installed
• RetroClamps™ attach anodes to pipeline
• RetroReader™ used to confirm connection

Anode sled installed on fixed-jacket platform

Sled replaced anodes removed during construction

• Anode sled was attached via RetroClamp™
• Saturation divers used to place sled

Anodes installed in chemical plant storage tank

Monitoring system also installed

• 12 weld-on zinc based anodes installed
• Potential monitoring panel using zinc reference electrodes was installed

Four RetroSleds™ installed on two pipelines

One installed on 10" line, three on a 6" line

• Installed from jack-up boat
• Divers helped place the sleds
• In Gulf of Mexico, south of Louisiana

RetroPods™ installed on ExxonMobil platforms in South China Sea

Guntong-F and Irong Barat-C platforms retrofit with RetroPods™

• Two platforms retrofit
• 36 RetroPods™ total installed on two platforms
• Assets in 63 meters of seawater

RetroSled™ installed on subsea pipeline

6" pipeline in the Gulf of Mexico

• Pipeline near Renaissance MP 76 platform
• RetroSled™ used to provide CP
• RetroClamp™ provides electrical connection
• Located in the Gulf of Mexico

RetroPods™ installed on FPU subsea equipment

Wellheads and gravity bases protected by RetroPods™

• 12 RetroPods™ and 18 Web-RetroClamps™ installed
• 10-year life extension
• 115 meter water depth

Arabian Gulf pipeline CP retrofit

• 25 RetroClamps™ deployed
• 8-inch pipeline from wellhead platform
• Used to electrically connect anode sleds

64 RetroLinks™ installed on pipelines

• 64 RetroLinks™ used
• 26 RetroClamps™ used to attach links
• Anode strings laid on seabed

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

160 km pipeline, platform, flare tower retrofit

Located in the Gulf of Thailand

• 81 RetroSleds™ and 162 RetroClamps™
• 13 Test stations installed
• RetroMat-CP Test Station™ used on buried pipeline

Hydrogen embrittlement study

Project Case Study: Hydrogen Embrittlement Study

• Study focused on clamp connector
• Possible gasket embrittlement from CP
• Internal sections of clamp monitored for CP
• Polarization of gasket could generate hydrogen

Houston Ship Channel dock

Project case study: Houston Ship Channel retrofit

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

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

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

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

ReCap™ data logger installed on BOP stack

Can log CP data for 4 years at 3,000 meter depths

• System includes high - impedance data logger
• Two V-String™ zinc reference electrodes used
• Data recorded every 15 minutes for four years
• Non-stop data logging of two independent channels

CP monitoring installed on marine fueling dock

Açu Maritime Fuel Terminal - TECMA north of Rio de Janeiro State

• 8 V-String™ reference electrodes and monitoring panel
• Berth 1: 185m X 32m
• Berth 2: 110m X 21m

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 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

Buffalo Bayou sheet pile survey

Corrosion survey of steel sheet piles in downtown Houston waterway

• Survey of submerged steel sheet piles
• Identify multiple discontinuities along piles
• 6 of 7 TRs were functioning
• Sampled mud and water for resistivity

Monitoring system for Australian pipeline

SunStation™, V-String™ and MA-1™ will monitor pipeline and hardware

• SunStation™ will monitor pipeline CP
• V-String™ reference electrode attached to SunStation™
• MA-1™ will monitor Spool Connection Assembly

Duncan Wharf

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

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

The cost of a bad pipe support

I-Rod® 28 years after installation

Cathodic protection sleds

Heavy-duty anode sleds for high water currents

• Heavy duty, lower profile sleds
• For high water current environments
• High-strength piping
• 20-year design life