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Cathodic Protection for Offshore Structures
Galvanic Cathodic Protection Systems
RetroPod™ Cathodic Protection Life Extension for Platforms...................................................................................3
SmartPod™ Cathodic Protection for Deep Water Assets ..........................................................................................6
RetroSled™ & ExpandaSled™ Cathodic Protection Life Extension for Pipelines.........................................................8
CP-Mat™ Cathodic Protection Mattress for Pipelines............................................................................................11
RetroLink™ Low-Cost Cathodic Protection System for Smaller Offshore Structures ...............................................13
Impressed Current Cathodic Protection Systems
RetroBuoy™ Impressed Current Cathodic Protection for Life Extension for Large Structures...................................17
RetroBuoy Jr™ Impressed Current Cathodic Protection for Life Extension for Smaller Structures ............................20
Raparound Anode™ Impressed Current Cathodic Protection for Jetties & Piers in Harsh Conditions .......................23
ROV II Cathodic Protection Probe ...................................................................................................................54
Deep-C-Meter™ ROV Subsea Readout System for CP Monitoring..........................................................................55
DC-II™ Drop Cell / Dip Cell for CP Monitoring........................................................................................................57
RetroPod™Cathodic Protection Life Extension for Platforms
by Deepwater Corrosion Services
Saves platform operators hundreds of thousands of dollars in offshore CP retrofit costs.
The RetroPod and RetroClamp in situ. The vertical - diagonalmember provides a convenient attachment point.
Product Overview
The Deepwater RetroPod cathodic protection systemhas saved many operators hundreds of
thousands of dollars in offshore CP retrofit costs. This is achieved by installing an optimized array
of sacrificial anode material (capable of delivering up to 20 Amperes) in less than a
quarter of the time it would take to install the equivalent CP using clamp-on anode arrays.
An installed RetroPod is located on bottom, just inside or outside the base of the jacket. This
semi-remote location greatly improves current distribution, and the installation can be
accomplished with divers or ROV’s using the RetroClamp™ tieback system.
Small, shallow 4-pile jacket structures can often be retrofitted with only one or two pods, thus several can be completed in a single offshore
day.
Four small booster anodes are added to the RetroPod when a structure has lost all cathodic
protection. The additional upper anode array provides a 15% current boost for the first 2-3
years to quickly re-establish cathodic polarization.
Like all of Deepwater’s innovative CP retrofit solutions, the RetroPod is guaranteed to perform.
Hundreds have been successfully installed.
Main Benefits
Reduces retrofit installed cost to approximately 1/3 of a conventional clamp-on fix. Many direct
comparisons are documented.
Improved safety; no direct diver intervention with heavy load. Safe 24 hour operation maximizes
offshore efficiency.
Optimized shape reduces mutual anode
RetroPod in situ sits 10 ft. from thebase of the structure on bottom, either
inside or outside of the jacket.
Concrete mattresses provide ampleballast to insure stability at the base.
RetroClamp is readily available from Farwest Corrosion Control Company.
interference, gives excellent bottom stability, and provides ease of handling offshore.
No increased weight loading on an aging structure and no problems finding places to
clamp anodes.
Easy to inspect during routine subsea inspections; current output from each pod can be
displayed if required.
Modular construction allows simple re-configuration for 10 to 25 year life extension in 5-
year increments.
Materials
RetroPod uses the highest available quality of sacrificial anode alloys. Typical ambient and cold
water Al-In-Zn compositions are used. All steel fabrication uses ASTM A 36 material and is
performed in Deepwater's manufacturing facility as well as at sub-licensed facilities in various
regions.
Design Life
10 to 25 years (depending on customer requirements).
RetroClamp Tie Back
Each RetroPod is shipped with one or more RetroClamps; typical cables are 2 x 25 feet #4/0
AWG heavy duty flex cables. Thousands of these clamps are now in service around the world, and
many have been installed by ROV. The installation efficiency of the RetroClamp has saved customers hundreds of thousands of
dollars.
Illustration showing the Clampbeing installed by an ROV.
The RetroClamp tie-back in situ.
SmartPod™Cathodic Protection for Deep Water Assets
by Deepwater Corrosion Services
Deep water cathodic protection using a modular anode structurewith on-board status monitoring.
A SmartPod protecting and monitoring two sub-sea trees.
Product Overview
The SmartPod system is an intelligent version of Deepwater's well-proven RetroPod™ cathodic protection system for offshore platforms. The system greatly simplifies deep water cathodic
protection by providing a modular anode structure with on-board status-monitoring, using
Deepwater's patented SunStation™ cathodic protection monitor technology (each unit
contains 3 SunStation monitors).
Each SmartPod can protect a number of discrete subsea structures and can be configured to
provide 20 years of cathodic protection to over 25,000 square feet of coated steel.
RetroClamps allow an ROV to connect to the subsea structures, and Polatrak® V-String™
reference electrodes provide the CP monitoring.
SmartPods can be quickly installed with any Work Class ROV system, and instant feedback on
current output and potential of protected structures is displayed on the SunStation™
readout.
Like all of Deepwater’s innovative CP solutions, the SmartPod is guaranteed to perform.
Main Benefits
Post installed, saves time and money, especially on pipeline installations.
Provides on-board monitoring, no more pipeline surveys or messing with portable CP probes.
Modular design, just figure how many square feet for how many years, then divide to get number of
pods required.
Protects many thousands of feet of pipelines, eliminate need for bracelet anodes.
SmartPod allows pipeline coatings to be
A concrete mattress at the base provides ballast for stability. CP
monitoring is provided by a SunStation monitor with 3 readouts.
Deep water SunStation monitor panelwith 6 digital readouts and 6 solar
panels.
ROV taking readings from a SmartPod.
maintained at maximum efficiency.
Applications
Deepwater Subsea Equipment
Infield Flowline Protection
Deepwater Pipeline Protection
Materials
SmartPod uses the highest available quality of sacrificial anode alloys. All steel fabrication uses
ASTM A 36 material and is performed in Deepwater's own manufacturing facilities.
SunStation™
The Sunstation monitor is a self-contained CP monitoring terminal powered strictly by the light
from an ROV. This eliminates the use of batteries, making SunStation ideal for deepwater
applications. Solar panels and LED’s are housed separately in either Delrin for use in < 300 m or
Stainless Steel for use in < 3000 m.
RetroClamp™ Tie Back
Each SmartPod is shipped with one or more RetroClamps. Typical cables are 2 x 25 feet #4/0
AWG heavy-duty flex cables. Thousands of these clamps are now in service around the world, and
many have been installed by ROV. The installation efficiency of the RetroClamp has cut installation costs and allowed for tie-back to any
pipe or tubular.
The SunStation separates the LED display (top) from the solar panels
(bottom).
A RetroClamp can connect the cathodic protection and secure a zinc
electrode.
RetroSled™ & ExpandaSled™Cathodic Protection Life Extension for Pipelines
by Deepwater Corrosion Services
Pipeline retrofit sled arrays for pipelines where anode burialbelow the natural seabed is required or anticipated.
ExpandaSled 3-element array, measuring 40' x 8', installedon the bottom to protect a pipeline
Product Overview
RetroSled and ExpandaSled™ (expanding RetroSled) are optimized pipeline retrofit sled
arrays designed for pipelines where anode burial below the natural seabed is required or
anticipated. Both are ROV installed.
Both sleds are available in standard configuration for 15 or 30-year design life. Sleds
are also equipped with single or dual RetroClamps™ to facilitate rapid and reliable tie
back to the pipeline or riser.RetroSled consists of a single 20' x 8' section and is installed by a diver or
ROV.
RetroSled is a single-section, rigid sled design measuring 20 ft x 8 ft. Use RetroSled to extend
life on a pipeline with good coating and still protected readings above -0.900V vs Ag/AgCl sw.
ExpandaSled consists of three sections, which unfold to a 40 ft’ x 8 ft anode on the bottom. Use
ExpandaSled when an extra current boost is required for a depolarized pipeline or one with a
degraded coating.
Both sleds are pre-programmed into Deepwater’s PipeMod™ attenuation modeling system, which calculates the optimized the spacing between
sleds.
Applications
Offshore pipelines. Note: in situations where seabed movement is anticipated, Deepwater does
not recommend the rigid RetroSled. See the CP Mat™ for these applications.
Main Benefits
Rapid and safe offshore deployment.
Proven design; hundreds of miles of lines successfully retrofitted.
Highest quality materials and anodes from Deepwater's affiliated foundries.
Materials
RetroSled uses the highest available quality of sacrificial anode alloys. Typical ambient and cold
water Al-In-Zn compositions are used. All steel fabrication uses ASTM A 36 material and is
ExpandaSled consists of three sections,
which unfold to 40' x 8' on the bottom.
RetroSled deployment from a boat.
ExpandaSled and RetroClamp installation by an ROV. Pipelines only have to be partially excavated (120°).
performed in Deepwater's own manufacturing facility as well as at sub-licensed facilities.
System Design Life
10 to 30 years depending on customer requirements.
RetroClamp™ Tie Back
Each RetroSled is shipped with two RetroClamps; typical cables are 2 x 25 feet #4/0
AWG heavy duty flex cables. Thousands of these clamps are now in service around the world, and
many have been installed by ROV. The installation efficiency of the RetroClamp has saved customers hundreds of thousands of
dollars.
The RetroClamp tie-back in situ.
CP-Mat™ Cathodic Protection Mattress for Pipelines
by Deepwater Corrosion Services
Cathodic protection for pipelines using a segmented concrete stabilizationmattress with an integrated cathodic protection system.
CP-Mat (left) with SunStation™ monitor in the over-trawlable RetroClamp™ (right)
Product Overview
CP-Mat by Deepwater Corrosion Services combines the proven technology of a segmented concrete
stabilization mattress with an integrated cathodic protection system. Placement of a CP-Mat
provides the required stabilization and the added benefit of up to 30 years of cathodic protection for up to 2 miles of pipeline in each direction.
Tie-back to the pipeline can be made with diver or ROV using the field proven Deepwater
RetroClamp system. There is no need to remove concrete weight coating.
Mats are provided with patented non-shielding soft pads on the underside and can be loaded
with aluminum or zinc anodes to operate offshore or in rivers.The mats can be used on pipeline
crossings to provide a free life extension system to the pipeline being crossed.
Main Benefits
The major benefit is that installation cost of the mat can be leveraged to the life extension of the
asset, providing significant cost savings.
The ultra-rugged and stable construction of the mattress provides a long-term stable retrofit
platform to suit any bottom conditions.
CP-Mat will work anywhere that a steel or reinforced concrete structure has to be stabilized
in a submergedsituation.
Sheet piled bulkheads
Bridge footings
Pipeline river crossings
CP-Mat provides a stable anode platform for all bottom conditions.
Aluminum anodes are cast inside concrete segments. The wire rope core
of the mat provides a low resistance anode array.
The pipe connection uses RetroClamps™.
Outfall / intake structures
Locks and dams
Offshore wind-turbines
CP-Mat Deployment
CP-Mat being deployed as a primary retrofit for a damaged pipeline.
The rubber underside protects pipeline coating integrity.
RetroLink™ Low-Cost Cathodic Protection System
for Smaller Offshore Structuresby Deepwater Corrosion Services
Low-cost anode array for cathodic protection consistingof a series of anodes cast onto a wire rope core.
A RetroLink cathodic protection array consists of anodes cast ontoa wire rope core for current conduction and support.
Product Overview
RetroLink by Deepwater is an anode array that comprises a series of anodes cast onto a wire
rope core. The anodes have been sized and spaced to provide low-cost, reliable cathodic
protection for a wide variety of offshore, inshore or marine structures. Installation
expenditures are minimal. In most cases, a diver is not required.
RetroLink strings come in three standard sizes of 30 ft, 60ft and 90 ft. These may be
deployed in three basic ways:
Surface suspended with trailing mud anodes.Used for 3-5 year CP of offshore structures in 90 fsw or less. Used as riser or infield pipeline
CP system with insulated hang-off option.
Subsea suspended with trailing mud anodes.Used to supplement RetroPod on 10-year
systems. RetroLink caisson installation.
Mud deployed. Used to protect ultra-shallow water structures, such as offshore wind
turbine caissons. Used as retrofit system for offshore pipelines.
The wire rope core provides both the electrical conductivity through the anode system and
superior mechanical support. The strings are made with up to fifteen anode segments.
These may be cut to length and deployed in many ways to provide cathodic protection just
where it is needed. If laid in the mud, the system life can be extended to almost 10
years.
RetroLinks should always be installed such that at least two anodes trail on the bottom. In
this configuration, sea movements are attenuated, and the string will not wrap around
the structure.
Select zinc or aluminum anode material depending on the salinity of your water. Zinc anodes are recommended if water is less that
12% full strength seawater (4.2 ppt Cl). Aluminum anodes are recommended for all
other applications.
RetroLink ready to ship.
RetroLink installation.
RetroLink Sizing
RetroLink 30 ft RetroLink 60 ft RetroLink 90 ftTotal number of anodes 5 5 10 10 15 15
Number of anodes in water 3 1 8 1 13 1Number of anodes in mud 2 5 2 9 2 14Current output, amperes * 4.4 1.9 9.9 5.5 14.9 5.3
Life at current output, years 3.5 11 4.1 12 4.5 13
* Figures given assume the following typical values: seawater resistivity 25 ohm-cm, mud resistivity 75 ohm-cm, cathode potential -0.800V vs Ag/AgCl, current density 50
Leader Assembly: Standard 25 ft length (can be field adjusted). Coated wire rope with all hardware for either surface suspension with Topside Suspension Bracket, or subsea
attachment with RetroClamp.
Topside Suspension Bracket: Allows topside suspension of RetroString may be electrically isolating for riser retrofits.
RetroClamp: Used for subsea attachment and electrical grounding to either jacket tubular or subsea pipeline.
V-String / SunStation: Integral monitoring system available for special applications.
Design Guide: Prints out a cathodic protection solution and a material list that can be priced with a simple e-mail or phone call to Farwest.
RetroLink installation.
Installation
A leader assembly is used for above-water suspensions and uses PVC-coated wire rope for corrosion resistance. The modular design allows the hang elevations to be easily adjusted inthe field. The weld-on topside suspension assembly can be attached to horizontal or vertical
members. The isolator can be used to have Links protect offshore risers. Links can be attached subsea using a modified hang-off. This allows the links to to provide large currents
cost effectively to deeper water structures when a limited design life is adequate.
Applications
1. Minimal Offshore Structures
Many offshore structures that sit in less than 85 f.s.w can have the corrosion protection system replaced very cost effectively using RetroLink. The system can be quickly installed
with a small topside crew. No diving is required. The system can provide 5 to 7 years of protection.
2. Offshore Wind Turbines
Foundation piles may be placed up to 1 year before the transition structure is installed. During this period RetroLinks can save the day, then can be recovered and redeployed during periods of grid power interruption. For quick, painless retrofit, this is the ideal
system.
3. Docks, Harbors and Wharves
RetroLink systems are reliable and easy to maintain using small under-dock access vessels and equipment commonly found around such installations. A simple design guide enables the facility owner to apply adequate levels of cathodic protection following a simple field verification procedure. Links have been installed to provide cathodic protection to bridge
pilings, whether reinforced concrete or steel. The installation is quick and easy.
4. Temporary Protection
Vessels in long-term wet storage can be protected cost-effectively by this system. Simple owner verification that submerged parts of the vessel are not corroding is possible with the
optional inspection kit.
5. Pipeline Risers
Short infield lines can be effectively retrofitted with RetroLinks, using the host structure as the support and grounding to the pipeline side of the insulating flange.
RetroBuoy™
Impressed Current Cathodic Protectionfor Life Extension for Large Structures
by Deepwater Corrosion Services
State-of-the-art impressed current technology for offshore structures.Modular sled based system for flexibility and ease of installation.
RetroBuoy is a remote anode system, ideally sitting approx 100 ft (30 m)from the structure, producing excellent current distribution.
Product Overview
RetroBuoy is the state-of-the-art impressed current technology for offshore structures.
The modular sled based system couples design flexibility with ease of installation
using diver or ROV support. With a proven track record of success, the RetroBuoy
system redefines impressed current retrofit technology, saving hundreds of thousands of
dollars in CP retrofit costs on even modest retrofit programs.
The RetroBuoy system cuts retrofit costs by Buoyant anode transport allows system
to operate at optimum current levels.
delivering more cathodic protection, more efficiently with each installed sled. One
typical RetroBuoy sled can deliver up to 400 Amps of corrosion protection – enough to
protect 80,000 square feet of steel. The conventional alternative protection would need 32 US tons of sacrificial aluminum.
Applications
Offshore platform jacket retrofit.
Very effective on multi-jacket complexes, capable of protecting multiple structures.
Spread-moored FPSOs.
Large dock structures.
Main Benefits
The lowest installed cost in the industry. Installation cost drives offshore CP retrofit
budgets: install a single RetroBuoy sled or 48 pairs of sacrificial anodes weighing 500kg
each.
Being a remote system, current distribution is optimized, and potential levels are
maintained within a tight range over the whole structure.
Exhaustive attention has been given to every design detail; RetroBuoy is modular and
redundantly designed.
The design allows the system to be quickly customized to provide sled current capacities from 250-500 Amperes for 15-25 year design
life. It also allows us to provide prompt delivery – typically 4-6 weeks from order.
Two 400 Amp units prior to deployment.
Available integral cable deployment hoppercan simplify installation.
RetroBuoy installed on bottom. RetroBuoy during float deployment.
All four anode floats deployed.
Specifications
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 6 and 32 depending on required life and current.
Buoyancy Modules: Tri-part syntactic foam 28 lb/ft3 (0.4485 g/cm3) with depth rating of 1000 f.s.w. (305 meters). Three or four buoyancy modules provided depending on required life and current. 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 & Cable Hopper: Welded steel construction, coated and provided with sacrificial anode CP for required life.
Power Supply: Transformer rectifier DC voltage is normally maintained to 24V, but may have to increase to either 36V or 48V for current ratings above 400 Amps or
water depth over 250 ft (76 m).
RetroBuoy Jr™
Impressed Current Cathodic Protectionfor 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.
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.
When installed on a fixed structure, RetroBuoy Jr. sits on bottom inside or
outside of the jacket
Main Benefits
The cable to the rectifier on the surface is secured to the member by a variety of
available clamping and strapping mechanisms.
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
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.
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.
Raparound Anode™
Impressed Current Cathodic Protectionfor Jetties & Piers in Harsh Conditions
by Deepwater Corrosion Services
Anode system with ultra-heavy duty support frame, impact absorbing composite
shield, and double steel wire armored supply cable designed to take abuse.
Raparound installed around a pier pilingin Cook Inlet, Alaska.
After two harsh winter freezes, the Raparound is still firmly in place.
Product Overview
The Raparound anode system has been designed with harsh environments in mind. From the
ultra-heavy duty support frame to the impact absorbing composite dielectric shield and the double steel wire armored supply cable, this
anode is designed to take abuse and continue working.
The design allows back-to-back installation to provide up to a 100 Ampere capacity anode for pile diameters between 12” and 48”. Pictured
unit is single sided.
The triple coated MMO activated titanium anode rod provides superior resistance to abrasion, and the modular Delrin anode housing design
affords excellent protection and long-term chlorine resistance to the oversized anode rod.
Originally designed for the Cook Inlet, Alaska, the Raparound has proven itself in extensive
time trials, surviving in the rapid ice-laden currents and punishing winter freezes where no other anode system has come close. Deepwater is confident that the Raparound will survive any
harsh environment where other anodes have not.
Applications
Any steel-piled marine structure.
Small offshore jacket structures
Main Benefits
Pile mounted anodes have historically suffered electromechanical problems. On the
Raparound, all these deficiencies have been engineered out.
Hinged one-piece diver-friendly design means that installation is safe and easy.
Standard RetroClamp for pipelines,pipes and small diameter tubulars.
RetroClamp with SunStation readout, nicknamed SmartClamp CP Monitor
Product Overview
RetroClamp provides fast reliable electro-mechanical tieback for subsea cathodic protection systems. Originally designed for pipeline CP retrofit applications, the RetroClamp is now
widely used in a variety of subsea retrofit projects. The standard RetroClamp for tubulars is pictured above.
Please also see RetroClamp CP, a modified version of RetroClamp which facilitates the attachement of anodes directly to the clamp.
Deepwater Corrosion Services is a recognized leader in offshore cathodic protection retrofit innovation. Hundreds of RetroClamp clamps are now in service in the Gulf of Mexico, and many have been installed by ROV. The installation efficiency of the RetroClamp has saved
customers hundreds of thousands of dollars. Successive iterations have significantly improved the product.
RetroClamp is also routinely customized for application to wellheads, vessels, and large-diameter members. It has been modified to allow subsea attachment of a wide variety of equipment, including cable runs and monitoring instruments. The customized wellhead
RetroClamp pictured to the right facilitates rapid attachment to a subsea pipe flange via a diver or ROV.
Main Benefits
Rapid installation even over concrete weight coatings.
Requires only partial excavation of buried pipelines for attachment.
Constant tension provides long-term reliability through vibration or thermal expansions.
Hollow ground tip contact (for pipelines) eliminates stress-raisers and replaces expensive friction welding.
Conventional cone tip available for structural connections.
Open-base design ensures clamp will pull loose if snagged, preventing any damage to pipeline.
A simplified subsea cathodic protection attachment solutionfor pipelines and other subsea structures.
RetroClamp CP puts the fix where it is needed – quickly & effectively.
Product Overview
RetroClamp CP by Deepwater Corrosion Services is a simple modification to Deepwater's RetroClamp diver & ROV friendly tie-back clamping system. RetroClamp CP allows
attachment of anodes directly to the clamp at the pipeline or metal structure. Now an ROV or diver can quickly install retrofit anodes to a subsea pipeline or other tubular section to add local cathodic protection in an optimized and predictable manner. This solution has
evolved based on previous project fixes designed and supplied by Deepwater on an ad hoc basis.
RetroClamp CP provides a simple effective solution to localized damage to offshore pipelines, or can provide retrofit to a whole pipeline system if there is a reason why the
SmartMat or RetroSled options are not preferred. It provides a perfect fix for damaged field joints, or localized coating damage on pipelines. I can also provide a fix for deepwater
mooring components or subsea production equipment.
The anodes can be added to any RetroClamp. Each anode has a net weight of 15 lb (7 Kg) and is cast from either Deep 7 or Deep 10 Aluminum Alloy. Anodes are added in pairs (30 lb)
increments to maintain balance and load distribution.
Anodes fit all clamp sizes and are always availablein stock, as are most standard clamp sizes.
A convenient calculator is provided below, which can help you see how much current and life an array of anodes can provide. Clamps can
accommodate more anodes as the diameter increases; each anode is sized to provide performance which approximates the original bracelet anodes
installed on most pipelines. The cross section is capable of sustaining a 10 year design life in seawater and 15 years in mud.
I-Clip™Anti-Corrosion Pipe Support Clips
for Grinnell Clamps & Pipe CradlesBy Deepwater
Clips on to new or existing saddle clamp-style supports,eliminating the crevice at the support.
I-Clip shown in situ on a saddle clamp support. I-Clip retrofitted or pre-installed in Grinnell clamps.
Description
I-Clip by Deepwater is an individual pipe support clip installed on the inside diameter of a pipe saddle (≤10 foot diameter). The clips themselves are mechanically held in place,
allowing them to be retrofitted easily along existing pipe runs. New Grinnell and cradle-style supports can also be easily fitted with I-Clip systems. I-Clips are made out of a
variety of materials, suited for elevated temperatures and large weight loads.
I-Clips are available to fit all standard size Grinnell clamps and pipe Saddles. I-Clips can be installed in new or existing pipe support clamps.
Applications
Pipe cradle retrofits
Large diameter band clamps
Concrete or timber pier supports
High load riser clamps
Key design points
Half-round shapeThe half-round shape minimizes contact between the pipe and the support, eliminating the
crevice. Keeping water out keeps corrosion at bay.
MaintenanceI-Clips also provides an electrically isolated stand-off between the pipe and the supporting beam or saddle clamp. This allows for easy maintenance and inspection, while preventing
galvanic corrosion between dissimilar metals (the pipe and support).
Durability
The I-Clip also has excellent compressive strength, UV stability, and a very low friction coefficient, ensuring reliable service for as long as the pipe requires it.
Specifications
Below are the basic specifications for I-Rod and T-Rod HT, the materials used to make the I-Clip.
Deepwater has also begun to offer PEEK material for environments that prove too severe for either
(though these instances are rather rare). For information on PEEK, or a specifications for any
other aspect of Deepwater's pipe support systems, please contact Farwest Corrosion Control
A rugged dual element reference electrode to provide CP status for 20 years.
Product Overview
The Deepwater Polatrak DR-2 is a rugged dual-element reference electrode designed to provide
CP status for 20 years. Hundreds of these electrodes are in reliable service all over the
world.
The current DR-2 has an improved machined black Delrin body, which enhances the impact
resistance of the assembled instrument.
A sintered Ag/AgCl reference electrode provides very accurate potential data to monitor
polarization of the structure. A heavy-duty zinc electrode element serves as a long-term, ultra-
reliable, low-resolution electrode.
The dual-element (Ag/AgCl sw / Zinc) reference electrode is designed for weld-on, bolt-on or
clamp-on attachment to an offshore structure.
Designed for permanent monitoring of cathodic protection systems, the electrode has a 20-year
design life. Added to the back of the instrument is a 10 square foot current density monitoring array,
such that polarization data may be logged directly from the instrument.
The DR-2 dual reference cell is equipped with one Ag/AgCl and one Zn
reference electrode for unparalleled accuracy.
DR-2 Dual Reference Cell in fabrication.
Available remote control monitoring systems are standard on new structures. Polatrak systems give you the option to tie into communication lines, providing remote cathodic protection
monitoring over existing infrastructure.
Applications
Offshore platform jackets & drill rigs.
Seawater ballast tanks on SPAR, TLP, and FSU /FPSO structures.
SPAR center well area.
Inshore structures, piers, jetties, wharve.
Subsea equipment wired to SunStation™ permanent readout.
As impressed current CP controller.
DR-2 Mark 1 in situ. The casing has been replaced by black Delrin on the
current version, Mark 2.
Main Benefits
Structures with permanent CP monitoring systems can be inspected subsea much less frequently.
The rugged design allows the system to be preinstalled or retrofitted.
The double steel wire armored cable can be free routed on offshore structures thus saving cost of conduit or duct systems.
The dual elements combine high accuracy ±0.005V with proven longevity.
Available with integrated current density monitor (product ID: DR-2–CD).
Specifications
Zinc Electrode MaterialDimensions
WeightAnti-passivation
Accuracy
Zinc (high purity 99.95%)6 x 5 x 11.5"
12 lbs (5.45 kg)Embedded carbon steel rods
±0.02 V
Ag/AgCl Electrode MaterialDimensions
WeightAccuracy
Sintered Ag/AgCl w/ silver wire core0.47" dia. x 0.20" (12 mm dia. x 5 mm)
0.09 oz (2.5 g)±0.005 V
Electrode Housing MaterialDimensions
Black Delrin18" x 5" x 4" (45.7 x 12.7 x 10.2 cm)
Cable Encapsulation Type Cold-mold soft polyurethane made inside embedded PVC condulet within electrode
housing.Electrode Frame Material
CoatingConduduit interface
ASTM A36 carbon steelMarine epoxy
2” pipe coupling or 2” 150# blind flange
Cable Type
ODBend radius
Weight/foot in air
2 x #12 AWG PVC insulated, PU bedded, DGSWA, HMWPE sheathed
Cable Type 42 x #12 AWG PVC insulated, PU bedded, DGSWA, HMWPE. Sheathed available upon
request.
Overview of Polatrak® CP Probesby Deepwater Corrosion Services
Choice of probes for offshore, subsea cathodic protection status measurement.
ROV II probe performing a pipeline survey.ROV II Probe with dual Ag/AgCl
reference electrodes.
Deep-C-Meter kit includes an ROV II probe,pictured here on the ROV T-Handle.
CP Gun delivered in a protective case.
CP Gun™
Twin Ag/AgCl Electrodes
Contact Probe (Bathycorrometer Style)
Replaceable Electrodes
Rated to 1000 fsw (305 m)
Integral Voltage Readout
Diver Held
DC-II™ Drop Cell
Twin Ag/AgCl Electrodes
Proximity Probe (Drop Cell or Dip Cell Style)
Rated to 1500 fsw (458 m)
ROV II™ Probe
Twin Ag/AgCl Electrodes
Proximity or Contact Probe
Rated to 10,000 fsw (3050 m)
Diver Held or ROV interfaced
Deep-C-Meter™
Twin Ag/AgCl Electrodes
Contact Probe
Replaceable Electrodes
Integral Voltage Readout
Rated to 10,000 fsw (3050 m)
ROV interfaced
Close Proximity Electrode
Twin Ag/AgCl Electrodes
Proximity Probe
Rated to 1000 fsw (305 m)
Diver Held
Probe Selection Guide
DC-II CP Gun Prox Electrode ROV II Deep-C-MeterElectrode type Twin Ag/AgCl Twin Ag/AgCl Twin Ag/AgCl Twin Ag/AgCl Twin Ag/AgClReplaceable electrodes?
No Yes No Yes Yes
Depth rating 1500 ft 1000 ft 1000 ft 10,000 ft 10,000 ftIntegral voltage
readout?No Yes No No Yes
Can be ROV interfaced?
No Yes Yes Yes No
Uses Drop cell for platform or
dock surveys
Diver or ROV assisted
surveys where a limited no. of
readings are needed
Diver assisted platform
inspections
Any underwater inspection
requiring tip contact
capability
Deep water ROV
inspections (pipelines, mooring, subsea
equipment etc.)
CP Gun™ Diver-Held Cathodic Protection Probe
by Deepwater Corrosion Services
A bathycorrometer-style, diver-held, dual-element probe for cathodic measurements.
Product Overview
The Deepwater Polatrak® CP Gun is designed for situations where a few contact CP readings are
required. The unit has twin elements for real-time self calibration, and dual ultra-bright LED readouts for use in dark waters or strong
currents, where visibility is low. These standard Polatrak features provide an unparalleled level of
accuracy and redundancy.
The Polatrak CP Gun is rated for use in depths up to 1000 feet (300 meters). The unit has a
convenient power-switch and operates on two 9 Volt alkaline batteries. This combination will
allow the user to stretch the 4-week battery life over an entire dive season.
The CP Gun is self-calibrating. Each LED is wired to a separate, individual reference element --
essentially two probes in one.
The CP Gun kit comes complete with operating and calibration instructions and a comprehensive
supply of spare parts.
Applications
Ship hull surveys
Platform surveys
Dock and jetty surveys
Main Benefits
Guaranteed accuracy, common error sources are eliminated with the twin element configuration.
Self-contained and self-calibrating. No tie-ins to the dive umbilical are required.
No battery chargers required, a full season from standard alkaline batteries.
The CP Gun is ergonomically designed for divers, with a pistol-grip and a
convenient, thumb-operated switch (red).
The ultra-bright LED display distinguishes
the CP Gun from other bathycorrometer-type probes.
CP Gun Kit delivered in a protective
All parts are replaceable.
case.
ROV II Cathodic Protection Probe
by Deepwater Corrosion Services
The world's best selling undersea general purpose tip-contact CP probe.
Product Overview
The Deepwater Polatrak® ROV II is the world's best selling general purpose tip contact undersea CP probe for offshore application. It was the first
such probe to be manufactured with twin elements to allow on-line calibration, eliminating
time-consuming procedures on-site, and reducing a large percentage of user error.
The ROV II easily interfaces with the ROV, but can also be held by divers. It serves as either a tip-contact or proximity-style probe, and if ROV
operators want to avoid connection to the umbilical, the ROV interfaces with Deepwater's Deep C Meter, providing a self-contained, direct
subsea readout, viewable on the ROV's video camera. Like all Polatrak CP probes, the ROV II is
fully field-serviceable, with plug-in electrode elements and interchangeable components.
Applications
Platform and riser surveys
As remote for multiple electrode surveys
Drill rigs & FPSO surveys
ROV II shown on compliant T-Handle mount
ROV II Probe, pictured here on the ROVT-Handle, being used in Deep-C-Meter
kit.
Ballast & water tank surveys
Jetty & dock surveys
Main Benefits
Guaranteed accuracy; common error sources are eliminated with the twin element configuration.
Can be used in tip contact or proximity mode with a surface ground wire.
Rugged construction allows easy replacement of worn parts without replacing entire probe.
Simple interface to Deep-C-Meter System or wire through ROV umbilical.
Hundreds in service; proven track record.
Companion Products
Polatrak Deep-C-Meter.
Polatrak DC-II Drop Cell as a compatible remote cell for multiple-electrode surveys.
ROV II used for Standard Pipeline Cathodic Protection Survey (ROV II T-
Handle not used)
Deep-C-Meter™ ROV Subsea Readout System for CP Monitoring
by Deepwater Corrosion Services
A self-contained CP monitoring system for deep-water ROV applications.
Product Overview
The Deepwater Polatrak® Deep-C-Meter is a self-contained CP monitoring system designed for deep-water ROV applications. It is a completely
self-contained system capable of monitoring contact CP potentials with the ROV II Cathodic
Protection Probe (no intervention with ROV systems in required). The system is comprised of
three basic components:
1) Readout Unit with twin voltmeters housed in a stainless steel pressure housing.
2) Probe with a twin-element, tip contact, CP probe (Polatrak Model ROV II), and
3) Flying Lead, a 2-meter long umbilical that connects the probe to the readout.
Rated for operation in up to 10,000 feet (3000 m) depth, this is the most widely used system of it's kind worldwide. The instrument readout unit can be conveniently mounted anywhere on the ROV
while the probe unit is held in the T-handle manipulator mount.
Applications
Deepwater subsea equipment ROV CP surveys
Anode and field gradient surveys
Deepwater Flow-line surveys
Main Benefits
The entire system can be installed on an ROV in minutes. It requires no interface to the ROV
umbilical system.
All data are recorded on the video display. Like all Polatrak CP Probes, it has twin electrodes for
on-line calibration and redundancy.
The unit runs on 9V alkaline batteries triggered by a photo-cell, allowing the batteries to last an
Polatrak Deep-C-Meter with ROV IImounted on T-Handle.
Polatrak Deep-C-Meter Readout Uniton Articulated Readout Mount
The Polatrak® Deep-C-Meter comesin a rugged field case.
entire dive season with continuous operation.
All parts are serviceable. Each unit comes with a comprehensive spares package.
The readout unit can be configured to work with any of Deepwater'a standard CP probes to read
potential, anode currents, current density or electrical field gradient (EFG).
DC-II™Drop Cell / Dip Cell for CP Monitoring
by Deepwater Corrosion Services
The standard proximity probe for a topside drop cell cathodic protection survey.
Product Overview
The Deepwater Polatrack® DC-II is the first and only twin-element portable reference electrode of
its kind. The twin electrode elements provide absolute verification of calibration and eliminate
survey inaccuracies.
The DC-II is used to survey more offshore structures worldwide than any other portable
electrode system, and is the most often specified instrument.
The evolution of this instrument has occurred over 15 years; the best combination of cable
specification, handling, ease of use, and most importantly, accuracy. This standard of
excellence has been achieved by talking closely with the people that use the product: the offshore
CP technician.
Trips offshore are expensive; don’t risk your data integrity. Specify the Polatrak® DC-II and get the
job right first time, every time. Deepwater
The DC-II comes complete with 250 ft of high grade seismic cable on a non-
metallic reel. A comprehensive instruction manual ensures that you
get accurate surveys every time.
Corrosion Services Inc. is a recognized leader in the field of offshore and marine cathodic
protection monitoring innovation. Deepwater's depth of experience is unparalleled in the
industry.
Main Benefits
Guaranteed accuracy; common error sources are eliminated with the twin elementconfiguration.
Rugged; these electrodes have been used on more surveys on offshore structures than any other drop cell.
Price competitive; the DC-II costs about the same as old-fashioned single element electrodes.