Heavy-Duty Bracelet Anodes for Subsea Pipeline Cathodic Protection
Heavy-duty galvanic bracelet anodes engineered for cathodic protection of offshore subsea pipelines, risers, and marine structures. Designed for direct attachment around coated steel pipes, these semicircular anode halves deliver reliable sacrificial corrosion control in submerged saline environments. Manufactured in-house under strict alloy composition controls to mitigate localized pitting and extend subsea asset operating life.
Key Features
Dual-Half Geometry
Precision-cast semicircular shells configured with flush-fitting bolting pockets for secure clamping around insulated or coated pipe strings.
Continuous Electrical Path
Integrated steel core inserts welded or mechanically bonded to mounting brackets, ensuring low-resistance electrical continuity with the carrier pipe.
High Current Output
Formulated to maintain stable open-circuit and closed-circuit potentials throughout long-term subsea deployment.
DNV-Compliant Chemistry
Alloy melts strictly analyzed via direct-reading spectrometer prior to casting to eliminate heavy-metal contaminants.
Standard Compliance: DNV-RP-B401, ISO 15589-2, ASTM B418 / ASTM B843.
Operating Environment: Subsea marine, brackish water, and buried marine mud.
Design Life: 10 to 30 years (dependent on mass, current demand calculations, and coating breakdown factor).
Tolerance: Dimensional casting tolerance within ±2 mm; weight variance controlled within ±3%.
Zinc Alloy (ASTM B418 Type II / US MIL-A-18001K): Recommended for seawater temperatures below 50°C (122°F); high resistance to self-corrosion in mud.
Aluminum-Indium-Cadmium / Zinc Alloy (Al-Zn-In): Standard for high-temperature offshore applications up to 80°C (176°F). High electrochemical efficiency (>2500 Ah/kg).
Magnesium Alloy: Deployed for high-resistivity freshwater or short-term temporary subsea deployment.
Core Inserts: Hot-dip galvanized structural steel or matching pipeline grade steel.
Insulating Spacers: Neoprene or polyurethane lining options to prevent damage to pipeline anti-corrosion coatings (FBE / 3LPE).
Applications
Offshore oil and gas subsea flowlines and transmission pipelines.
Subsea pipeline crossing supports and tie-in spools.
Offshore wind farm export cables and monopile transition zones.
Deepwater marine risers and outfall piping.
Customization Options
Dimensional Tailoring
Custom inner diameters (ID) engineered to match exact pipe outer diameters (OD) combined with specific field joint or anti-corrosion coating thicknesses.
Weight Optimization
Tailored net anode weight and geometry calculated from project-specific current demand designs.
Fastener Configuration
Grade B7 / L7 heavy hex bolts, nuts, and locking mechanisms supplied with fluoropolymer coatings for subsea corrosion resistance.
Stamping & Identification
Cast-in or stamped heat numbers, alloy designations, and client tagging for full traceability.
Melting & Casting: Induction furnace melting with continuous temperature logging and slag skimming protocols.
Spectrochemical Analysis: OES (Optical Emission Spectrometer) testing per heat batch to verify trace element limits (e.g., iron, copper, silicon thresholds in zinc/aluminum alloys).
Electrochemical Testing: Periodic sample testing in accordance with DNV testing annexes to measure actual current capacity and closed-circuit potential.
Dimensional Inspection: 100% verification of inner diameter, bolt-hole spacing, and gap clearance using calibrated radius gauges and CMM equipment.
Documentation: Full EN 10204 3.1 Material Test Reports (MTRs) provided; Third-Party Inspection (TPI) by DNV, BV, or SGS available upon request.
Packaging & Shipping
Stacked securely on heavy-duty fumigated wooden pallets or steel skids.
Separated with protective cushioning to prevent coating damage on lined inner surfaces.
Secured with heavy-gauge steel strapping and weather-resistant wrapping for open-deck container or break-bulk ocean freight.
Lifting lugs and weight distribution points marked for safe crane handling at port or on vessel decks.
Frequently Asked Questions
Request a Quote (RFQ)
To receive a prompt technical and commercial proposal, please provide the following project parameters:
1.Pipeline Outer Diameter (OD) & Coating Thickness.
2.Anode Alloy Type (Zinc / Aluminum-Indium / Magnesium).
3.Required Net Weight per Anode or Project Design Life.
4.Total Quantity & Required Delivery Schedule.
5.Inspection Requirements (EN 10204 3.1 MTR, TPI requirements).
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