In the harsh marine environments of offshore wind farms and subsea energy installations, protecting high-voltage subsea cables is a critical priority. Among the essential technologies used to ensure cable integrity is the hang-off system—a robust suspension and sealing system that securely fixes the cable at the topside interface.
What is a hang-off solution?
A hang-off solution is a mechanical clamping and sealing device designed to anchor and protect subsea cables where they exit j-tubes or cable ducts at offshore platforms, wind turbine foundations, or substations. It performs two vital functions: Supporting the full weight of the cable and providing a reliable, long-term environmental seal.
Key features of Philson's sealed hang-off systems
• Exceptional sealing performance
The interior of the hang-off unit is filled with a specially formulated polyurethane resin that hardens around the cable, forming a completely watertight barrier. This prevents the ingress of seawater, salt mist, and corrosive vapors, crucial for protecting both the cable armor and adjacent platform infrastructure.
• High mechanical strength & secure cable fixation
Filson's design features a split symmetrical stainless steel clamp, precision-engineered to distribute load evenly and withstand the dynamic forces of offshore conditions. Once installed, the cable is firmly immobilized, preventing movement, chafing, or fatigue over time.
• 316L marine-grade stainless steel housing
Built to resist corrosion in aggressive saltwater environments, the outer structure is made of 316L stainless steel, ensuring longevity and structural integrity even after years of exposure.
• Extended service life
Tested to perform over decades of offshore operation, Philson’s hang-off systems are engineered with materials and designs that deliver a service life of 25+ years, matching or exceeding the design life of most offshore wind assets.
• Fast, safe installation
The split-body design allows for easy installation around pre-terminated cables, minimizing offshore labor time and reducing operational risks during cable pull-in operations.
Typical applications
Offshore wind monopile and jacket foundations
Riser hang-off points on oil and gas platforms
Transition joints on floating wind installations
Substations and cable deck terminations
As offshore energy systems scale up, the performance of every component becomes increasingly critical. Philson’s sealed hang-off solutions offer superior sealing, outstanding mechanical security, and long-term durability. Whether used in wind, oil & gas, or subsea cable systems, they are a key technology for ensuring long-lasting cable protection and platform safety.
