The Sealed Hang-Off System is a critical component in offshore wind farm construction, specifically designed for anchoring, sealing, and protecting subsea power cables at their interface with the topside platform. Typically installed at monopile entries, transition pieces, or floating foundations, the system ensures both mechanical integrity and environmental sealing of the cable termination points.
The core function of the Sealed Hang-Off System is to prevent seawater vapor intrusion, thereby avoiding corrosion of the cable armor layer and surrounding metal structures. Its interior is filled with polyurethane sealant, which hardens to form a secure wrap around the cable, providing high-strength fixation and a waterproof barrier.
Key Structural Features of the Sealed Hang-Off System
Symmetrical Split Design: The hang-off body adopts a two-part clamping structure that can be installed directly around pre-laid cables without the need for cutting or disconnection, simplifying offshore operations and reducing installation time.
Marine-Grade Stainless Steel Construction: The main body is constructed from corrosion-resistant materials, offering excellent durability even in harsh saltwater environments, thereby extending the service life of the system.
Polyurethane Injection Chamber: The internal cavity is designed for injecting liquid adhesive, which cures to form a durable sealing layer around the cable, ensuring strong grip and blocking moisture ingress.
Integrated Cable Support and Locking Mechanism: Optional inserts or locking rings provide additional mechanical locking, helping to distribute cable weight and reduce displacement caused by wave and wind loads.
Main Functions of Offshore Wind Cable Hang-Off Systems
Reliable Cable Fixation: Provides dependable mechanical support for vertical or inclined cables in offshore wind installations.
Sealing and Moisture Protection: Effectively blocks seawater vapor and airborne moisture from entering the cable connection area.
Effective Corrosion Prevention: Prevents premature damage to cable armor and adjacent structural components by avoiding exposure to marine moisture.
Optimized Stress Distribution: Evenly distributes cable loads to prevent damage during operation or under extreme weather conditions.
Typical Application Scenarios for Subsea Cable Hang-Off Devices
Monopile Offshore Wind Foundations: Installed on the upper part of monopile foundations for the entry of export or inter-array cables into the tower.
Jacket Foundations: Suitable for junction boxes or top panels of multi-leg jacket platforms.
Floating Wind Platforms: Applicable for semi-submersible or tension leg platforms to secure dynamic cable risers.
Transition Pieces: Integrated into the cable management interface between the subsea section and the tower structure.
As offshore wind farms expand into deeper waters and harsher environments, the reliability of cable sealing and support systems becomes increasingly vital. Philson's Sealed Hang-Off System offers a robust, corrosion-resistant, and easy-to-install solution for anchoring subsea power cables in both fixed-bottom and floating wind platforms. With durable materials, an intelligent split design, and high-performance polyurethane sealing technology, our hang-off devices ensure long-term protection and operational stability. Contact us today to customize a hang-off system tailored to your wind energy project requirements.
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