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01 // Overview & Challenge

As the US offshore wind sector expanded, Boskalis commissioned Weyres Offshore to deliver subsea noise mitigation for the installation of over 160 XXL monopiles. The multi-year campaign covered three contiguous offshore wind sites off the US East Coast (Rhode Island, Massachusetts, and New York): South Fork Wind, Revolution Wind, and Sunrise Wind.
To comply with stringent US environmental permits and developer Ørsted’s operational mandates, Weyres deployed a Double Big Bubble Curtain (DBBC) spread to ensure continuous, high-efficiency Far Field Noise Mitigation and safeguard marine ecosystems during heavy piling operations.

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02 // Operational Scope
Weyres Offshore assumed full technical, operational, and maintenance responsibility for the DBBC system throughout the entire multi-year deployment:
Pre-Execution Engineering: Method Statements, Risk Assessments (RAMS), crew scheduling, logistics, and regulatory compliance alignment.
System Overhaul & Staging: Full technical overhaul, Factory Acceptance Testing (FAT), and dedicated spare parts staging prior to vessel mobilization.
Winch Operations: Specialist-led deployment, precise seabed positioning, and recovery of DBBC hose arrays.
Offshore Technical Crew: Continuous deployment of certified mechanical technicians for 24/7 system operation, deck handling, and real-time maintenance.
Offshore Project Management: Daily compliance reporting, active resource management, and direct liaison with Boskalis offshore management.

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03 // Logistics & The "Leapfrog" Methodoligy 
To maximize Heavy Lift Vessel (HLV) utilization and eliminate expensive piling downtime, Weyres executed a high-redundancy, staggered deployment strategy.
System Redundancy (4 + 2 Setup)

• 4x DBBC Winches: Actively operating in rotation throughout the campaign.

• 2x DBBC Winches: Kept on board as dedicated, active spares for 100% equipment redundancy and zero technical delay risk.

The "Leapfrog" Execution Cycle

1. Pre-Laying Array 01: The DBBC support vessel deploys the inner and outer hose rings at Location 1, marks the position, and moves ahead.

2. Pre-Laying Array 02: While the HLV maneuvers into position at Location 1, the DBBC vessel sails to Location 2 and deploys the second complete hose array.

3. Piling Support at Array 01: The DBBC vessel returns to Location 1, hooks into the pre-laid hose array, and runs active air delivery during HLV piling.

4. Continuous Rotation: Upon piling completion at Location 1, the DBBC vessel retrieves Array 01 and leaps ahead to Location 3.

Result: Zero HLV waiting time. Continuous, uninterrupted foundation piling cycles across 160+ locations.​

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04 // Performance & Asset Aquisition
Client Feedback (Boskalis)
 

Equipment Reliability:
100% operational uptime achieved across extreme seasonal weather windows.

Personnel Expertise:
Exemplary communication and deep technical competence from offshore mechanical crews.

Safety & Execution:

Strict adherence to international offshore safety standards with zero lost-time incidents (LTI).

​​Strategic Project Outcome

Following the flawless execution and proven system reliability across all three Ørsted wind farms, Boskalis acquired the specialized DBBC noise mitigation winches directly from Weyres Offshore at the conclusion of the campaign.

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