Cathodic Protection

MARINECATHODIC

PROTECTION

A Survey Article by ELTECH Corporation

Marine Corrosion

Today, much of our infrastructure built upon steel components is seriously threatened by a destructive and persistent enemy: corrosion. If not properly protected, your marine facility is corroding right now as you read this web page. The rate of corrosion for clean, bare steel is at least 5 mils per year. This loss in material thickness can be greatly accelerated by variations in water composition, oxygen concentration cells associated with marine growth, and water velocity.

Many marine facility owners mistakenly believe that the coating of all submerged steel eliminates the need for cathodic protection. However, as much as 50% of the coating on a steel marine structure can be damaged, or completely removed during construction. Even undamaged coatings suffer from the presence of microscopic pinholes, which lead to the development of concentrated areas of corrosion. This severe form of pitting corrosion can have corrosion rates as high as 50 mils to 80 mils per year - resulting in complete penetration of 1/4" steel plate in under four years.

Cathodic Protection

The preferred technique for mitigating marine corrosion, based on historical performance and measurable results, is cathodic protection (CP) - the practice of using electrochemical reactions to prevent the corrosion of steel structures. The reason for increased acceptance: cathodic protection prevents corrosion on underwater structures.

In theory and practice, the implementation of a CP system is quite simple. Assuming you already have corroding steel in seawater, all you need is an anode, a power supply, and engineering talent. A

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protective circuit is accomplished between the anode, steel (cathode), power supply and electrolyte (seawater).

Impressed Current vs. Sacrificial

Standard industry practice for cathodic protection in new construction includes the installation of sacrificial anodes, such as aluminum and zinc. These types of anodes will typically provide a 10 to 20 year service life before requiring replacement. When retrofitting or replacing these existing CP systems, the most cost effective system is impressed current anodes, which require an external power source for their operation. The ease of installation, enhanced performance and lower installed cost of impressed current anodes make them the ideal CP system for retrofitting most structures.

Typical Anode Delivery Systems

On the design basis of maximum current distribution for the lowest possible cost, with the most long-term reliability, ELTECH has developed numerous anode current delivery systems suited for a variety of facility types and anticipated operating conditions. The following are but a sample of the many delivery systems commercially available. Our design engineers are likewise capable of creating custom systems to suit the requirements of your marine facility.

Pile Mounted Anodes

Pile Mounted Anodes are designed for efficient current distribution in and around pilings where the complex geometry of the facility precludes remote placement of the anodes. These delivery systems are suitable for direct attachment to pilings. The Flat Back Pile Mounted Anode was designed specifically for H-Piles, and can also be configured for installation on sheet piling.

Disk Anode

The Disk Anode was designed in conjunction with the U.S. Army Construction Engineering Research Lab for use on navigational locks and dam gates. This anode system is also suitable for use on seawater intake structures, vessel internals, and sheet piling when shoreside access is possible.

Retractable Mount

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For installations where it is deemed necessary to access the anode for periodic maintenance, or when current is only required on a periodic basis, the retractable anode allows the user to easily retrieve the anode. The above illustration is rotated by 90 degrees.

Sled Anodes

Anodes mounted on the sea bed typically afford the best spread of protection on a marine structure. Sled anodes can be designed for operation in either seawater or buried in the mud. The Post Tension Sled was developed to insure anode operation out of the mud when resting in silty and soft sea beds. By adjusting the height of the concrete sled, the mesh anode sled can also be designed for operation out of the mud. The advantage of this type of sled is its low profile, thereby limiting the potential for damage by anchors, fishing nets, etc.

Suspension Anodes

Suspension Anode Delivery Systems allow for strategic placement of anodes in and around a marine facility, providing optimum distribution of current. Many suspended anode systems are also suitable for mounting on pilings, or other structural steel.

Rod Anode

Although incorporated into a variety of anode delivery systems, the rod anode is most commonly used for the cathodic protection of seawater intake structures and vessel internals.

Background on ELTECH

Marine CP Technology

Proprietary technology, in tandem with advanced products and engineering, position ELTECH as a leading cathodic protection materials supplier.

ELTECH, the manufacturer of ELTECH LIDA mixed metal oxide anodes, benefits from the substantial resources of its parent, ELTECH System Corporation, which is the world's leading

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developer and producer of DSA technology for the chlor-alkali and other electrochemical industries. ELTECH Corporation's unique products and innovative systems have been halting corrosion in steel-reinforced concrete and conventional offshore and in-shore structures since 1974.

Mixed Metal Oxide Anode Technology

ELTECH LIDA anodes are comprised of a titanium substrate with a mixed metal oxide coating. The mixed metal oxide is a crystalline, electrically conductive coating that activates the titanium and enables it to function as an anode. This coating has an extremely low consumption rate, measured in terms of milligrams per year. As a result of this low consumption rate, the anode dimensions remain nearly constant during the life of the anode, providing constant levels of performance for the duration of the anode design life. Due to the ductility of the titanium substrate, a wide range of anode shapes suitable to the structure to be protected are possible, such as wire, rod, tubular, disk and mesh configurations.

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Anodes - Cast Iron

Anotec Solid High Silicon Cast IronAnotec Tubular High Silicon Cast IronAnotec High Silicon Iron Tubular Anodes Centertec Z-SeriesAnotec Small High Silicon Cast IronDischarge Guide for Anotec AnodesTechnical Paper, “Effect of Microstructure on High Silicon Cast Iron”

Anodes - Graphite Farwest Center Connected Graphite Anodes

Anodes - Mixed Metal Oxide

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Anodes - Platinum Anomet Platinum Clad Anodes

Anodes - Specialty Anode Systems EDI Linear Anode Systems

EDI Model RI-ICE Pack Impressed Current Anode

AnodeFlex Flexible Anode Systems Overview AnodeFlex 850 Flexible Anode SystemAnodeFlex 1500 Flexible Anode System

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Splice Kits for AnodeFlex 1500 Linear Anode System

Backfill

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Anodes - Aluminum Aloline Aluminum Anodes by Farwest

Anodes - Magnesium

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Elektron Modular High Performance Anode for Offshore Application

Anodes - Zinc

Zinc Anodes for Marine ApplicationPlattline Zinc Ribbon Anodes for Cathodic ProtectionPlattline Zinc Ribbon Anodes for AC MitigationPlattline Zinc Ribbon Anodes for Above Ground Storage TanksPlattmatt Zinc Ribbon Anode Grounding MatsTechnical Practices for Zinc Ribbon Anode ConnectionsZinc Caps by Mars

Anode Backfill Galvanic Anode Backfill by Farwest

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Cable, Splicing Products,Cable Attachment

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Cable for Cathodic Protection

High Molecular Weight Polyethylene (HMWPE) CableDual Jacketed Halar / HMWPE CableDual Jacketed Kynar / HMWPE Cable

Cable Splicing Materials

3M Splice Kits for Non-Shielded Cable3M Direct Bury Splice Kits

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Cable Attachment

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DC Power Supplies& Accessories for

Cathodic Protection



Cathodic Protection Rectifiers

Cathodic Protection Rectifiers UL Approved Rectifiers Model ES / TufBox Rectifiers

Watertight 200 Watt Utility Rectifier

Pulse Rectifiers Model 2015 Air Cooled Pulse Rectifier by Farwest

Model 3015 Oil Cooled Pulse Rectifier by Farwest "Well Casing Cathodic Protection Utilizing Pulse Current Technology."Corrosion 2004 Conference paper reprinted with permission of NACE International."Corrosion Measuring Techniques Confirm Effectiveness of Pulse Cathodic Protection for Buried Steel Pipeline."Corrosion 1999 Conference paper reprinted with permission of NACE International.

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"Evaluating Oil Well Casing Corrosion Using Well Head Current Measurements."Reprinted with permission of Ted Doniguian, author."Protecting Semi-Close Spaced Oil Well Casings With Multi-Module Pulse Cathodic Protection."Reprinted with permission of Ted Doniguian, author.

Rectifier Cabinets POWERHOUSEplus UL-Approved, Ornamental Rectifier Cabinet by Farwest

Alternative Power Supplies

Solar Power Supplies for Cathodic Protection

Solar Power Supply Charge / Output Controllers

Solar Power Supply Components Thermoelectric Generators by Global







Test Stations, Junction Boxes, Line Markers & Coupons for Cathodic

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Cathodic Protection Accessories by Tinker & Rasor

Test Stations, Flush Mount Flush Fink Test Station by Cott

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Concrete Test Box by Farwest

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Reference Electrodesfor Cathodic Protection



Portable Reference Electrodes & Accessories

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Permanent Underground Reference Electrodes

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Specialty Reference Electrodes

Antimony Electrode for pH Measurement by AgraEDI Model FA Adjustable Through Wall Reference ElectrodesEDI Model FS Standard Through Wall Reference ElectrodesEDI Model FE Through Wall Reference Electrode for Extreme EnvironmentsEDI Model T Tube Sheet Reference ElectrodesStaperm Permanent Through Wall Reference Electrodes by GMCStaperm Contact Eliminator, Gelatin Filled Casing by GMCStelth 7 IR-Free Permanent Reference Electrodes by Borin






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Pipeline Corrosion Monitoring Systems



ScadaNET Network - Wireless & Internet Based Monitoring & Control Systems

ScadaNET CellularRMU - Complete Rectifier Control & Monitoring Unit

ScadaNET RMUvi - Basic Wireless Rectifier Monitoring

ScadaNET P2S - Battery Powered Pipe-to-Soil Test Point Monitor

ProActive Pipeline Integrity System by MC Miller Co. #1

ProActive Pipeline Integrity System by MC Miller Co. #2

Data Link Pro for SinCorder by MC Miller Co.


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Polarization Cells &Overvoltage Protection



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