Jacket Anodes for Offshore Structures
RELI SLEEVE Jacket Anodes are engineered sacrificial anode systems designed to provide reliable cathodic protection for offshore jackets, platforms and submerged steel structures exposed to seawater and demanding marine environments.
Jacket Anodes for Reliable Offshore Cathodic Protection
Jacket Anodes are sacrificial anodes used as part of cathodic protection systems for offshore jackets, platforms and other submerged steel structures. They are designed to provide galvanic protection to exposed steel surfaces by acting as the sacrificial element within the corrosion protection system.
RELI SLEEVE develops and supplies engineered anode solutions for offshore structures, oil and gas facilities, marine infrastructure and other applications where steel assets are continuously exposed to seawater. Anode configuration, dimensions, alloy selection, capacity and installation requirements can be determined according to project-specific cathodic protection requirements.
Backed by the experience of the Reliable Group, with a business history extending back to 1975, RELI SLEEVE combines industrial material knowledge with pipeline and corrosion-protection engineering. The Group has served Oil & Gas, Petrochemical, Power, Water, Infrastructure and Process Industries through trading, importing, manufacturing, exporting and engineering solutions.
Building on this engineering foundation, RELI SLEEVE has expanded into advanced corrosion protection technologies including anodes and cathodic protection systems. This expansion strengthens the Group's ability to support customers with integrated solutions for pipeline integrity, offshore structures and long-term asset protection.
Engineered for Marine & Offshore Protection
Marine Protection
Designed for submerged steel structures operating in seawater and marine environments.
Engineered Design
Anode configuration and dimensions can be developed according to project and cathodic protection requirements.
Alloy Selection
Aluminium and zinc anode systems can be selected according to application and specified technical requirements.
Long-Term Protection
Designed to support the required cathodic protection performance and project design life.
Jacket Anodes Technical Data
Jacket Anodes can be engineered and supplied according to application requirements, cathodic protection calculations, environmental conditions and applicable customer specifications.
| Parameter | Technical Data |
|---|---|
| Product Type | Jacket / Offshore Structure Anode |
| Protection Method | Sacrificial Cathodic Protection |
| Primary Application | Offshore Jackets, Platforms and Submerged Steel Structures |
| Operating Environment | Seawater / Marine Environment |
| Available Anode Materials | Aluminium Alloy and Zinc Alloy Anode Systems |
| Configuration | Project / Structure Specific |
| Dimensions | As per Engineering Requirement |
| Installation | Welded / Project-Specific Installation |
| Design Life | As per Cathodic Protection Design |
Anode Grades & Applicable Standards
RELI SLEEVE aluminium anodes can be manufactured according to applicable alloy and project requirements, including Galvalum III equivalent, DNV, ISO and Alanode specifications. Zinc anodes can be manufactured according to US Mill Specifications, ASTM requirements or customer specifications.
Aluminium anode alloy specification.
Applicable DNV and ISO requirements.
Alanode alloy composition requirements.
Zinc anode chemical composition requirements.
Zinc anode specification as provided for the applicable product requirement.
Anodes can be manufactured according to approved project requirements.
Aluminium Anode Chemical Composition
Standard chemical composition for aluminium anodes is shown below. The final alloy chemistry can be produced according to the applicable standard or approved client specification.
| Element | Galvalum III Equivalent | DNV & ISO | Alanode |
|---|---|---|---|
| Zn | 2.0 – 6.5% | 2.5 – 5.75% | 0.50 – 5.00% |
| In | 0.01 – 0.02% | 0.016 – 0.04% | 0.005 – 0.05% |
| Si | 0.08 – 0.20% | 0.12% Max. | 0.10% Max. |
| Fe | 0.12% Max. | 0.09% Max. | 0.13% Max. |
| Cu | 0.006% Max. | 0.003% Max. | 0.01% Max. |
| Cd | 0.002% Max. | — | — |
| Others (Each) | 0.02% Max. | 0.02% Max. | 0.02% Max. |
| Others (Total) | 0.06% Max. | — | — |
| Al | Remainder | Remainder | Remainder |
Aluminium anodes can be manufactured as per Galvalum III equivalent, DNV, ISO, Alanode standards or client-specific specifications. Final chemistry should be confirmed against the approved project specification.
Zinc Anode Chemical Composition
Zinc anodes can be manufactured according to applicable US Mill Specifications, ASTM requirements or approved client specifications.
| Element | US Mill Specification | ASTM B148-II |
|---|---|---|
| Al | 0.10 – 0.50% | 0.005% Max. |
| Si | 0.125% Max. | — |
| Cd | 0.025 – 0.15% | 0.03% Max. |
| Fe | 0.005% Max. | 0.0014% Max. |
| Pb | 0.006% Max. | 0.003% Max. |
| Cu | 0.005% Max. | 0.002% Max. |
| Zn | Remainder | Remainder |
Zinc anodes can be manufactured according to US Mill Specification, ASTM requirements or customer-specific specifications. Applicable material requirements should be confirmed during project approval.
Aluminium Anode Electrochemical Characteristics
The following electrochemical characteristics provide the specified performance reference for aluminium anodes operating in seawater.
| Performance Parameter | Technical Value |
|---|---|
| Operating Environment | Seawater at 23°C |
| Open Circuit Potential | More negative than −1.1 V w.r.t. Ag/AgCl |
| Closed Circuit Potential | More negative than −1.05 V w.r.t. Ag/AgCl reference electrode |
| Anode Capacity | 2,550 – 2,750 A·hr/kg |
Electrochemical performance is dependent on alloy chemistry, operating environment, temperature, current demand, design requirements and the applicable cathodic protection system. Project-specific calculations and approved technical requirements should govern final selection.
Applications of Jacket Anodes
Jacket Anodes are suitable for cathodic protection systems serving offshore and marine structures where submerged steel surfaces require controlled corrosion protection.
Why Choose RELI SLEEVE Jacket Anodes?
About RELI SLEEVE
Reliable Group Experience Since 1975
RELI SLEEVE is part of the Reliable Group, which has served the Oil & Gas, Petrochemical, Power, Water, Infrastructure and Process Industries for more than five decades. Beginning as a trading business supplying steel pipes, plates and industrial raw materials, the Group evolved into an international organization involved in trading, importing, manufacturing, exporting and engineering solutions.
The Group's flagship Reliable Pipes & Tubes Ltd. supplies stainless steel, carbon steel, alloy steel and special steel products including pipes, tubes, fittings, flanges, plates, coils, bars and industrial components. RELI SLEEVE was established as a specialized division for corrosion protection and internal coating solutions, serving Oil & Gas companies, EPC contractors and pipeline operators.
Building on this foundation, RELI SLEEVE has expanded into advanced anode products and cathodic protection systems. This development strengthens the Group's ability to provide broader pipeline integrity and asset protection solutions for customers in India and international markets.
Frequently Asked Questions
Jacket Anodes are sacrificial anodes used in cathodic protection systems to help protect submerged steel jacket structures and offshore platforms from corrosion in marine environments.
RELI SLEEVE can provide aluminium alloy and zinc alloy anode systems according to the application, cathodic protection design and applicable project specification.
Aluminium anodes can be manufactured according to Galvalum III equivalent, DNV, ISO, Alanode or approved client specifications, subject to the applicable project requirements.
The provided electrochemical performance data specifies an anode capacity of 2,550–2,750 A·hr/kg for aluminium anodes operating in the stated seawater test environment.
Yes. Anode alloy, dimensions, configuration and other technical requirements can be considered according to approved project and customer specifications.
Jacket Anodes are used for selected offshore jackets, platforms, submerged marine structures and other steel assets requiring sacrificial cathodic protection.
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