J-Tube Bend Restrictors for Offshore Wind & Subsea Power Cables
In subsea cable installations—especially within the offshore wind and oil & gas sectors—excessive bending during construction or under extreme hydrodynamic loads is the leading cause of cable failure. Philson’s Polyurethane Bend Restrictors (BR) provide a robust, modular mechanical shield designed to maintain the cable's integrity at critical stress points.
Integrated Protection System
Our bend restrictors are engineered to work seamlessly as part of a complete cable protection system (CPS). They are typically deployed at:
J-Tube Interfaces: Used in conjunction with J-Tube Sealing Devices or Centralizers at the lower bellmouth to ensure the cable exits the tube within its safe bending envelope.
Free-Span Sections: Providing localized stiffness where cables transition between seabed and structures.
Core Functions: Three-Tier Protection
Mechanical Bend Limitation: The interlocking mechanism enforces a "lock-out" radius that is strictly larger than the cable's Minimum Bend Radius (MBR), preventing internal fiber or conductor damage.
Abrasion & Wear Resistance: The ruggd polyurethane shell acts as a sacrificial layer against seabed friction and rock abrasion.
Impact Shielding: High-toughness material absorbs kinetic energy from external impacts (e.g., dropped objects or fishing gear), preventing sheath rupture.
Technical Advantages & Material Science
Philson utilizes specialized MDI-based Polyurethane to ensure performance in the harshest marine environments:
Modular "Half-Shell" Design: Our Harvard-type modular structure allows for rapid interlocking assembly. This "chain-link" configuration ensures a smooth transition of forces through the restrictor string.
Neutral Buoyancy Advantage: With a density of < 1.17g/cm³ (nearly matching seawater), our modules add virtually no parasitic weight to the cable, avoiding unnecessary sagging or tension issues.
Super Duplex Fasteners: To guarantee a 25-year service life, all fasteners are made of Super Duplex Stainless Steel, offering industry-leading resistance to pitting and crevice corrosion in salt spray and submerged conditions.
High Load Bearing: Capable of withstanding lateral compression ≥ 8t, ensuring the restrictor remains functional even under heavy burial or seabed pressure.
Technical Specifications (Standard Range)
We provide both standard and bespoke sizes tailored to your specific project requirements.
Feature | Specification |
Common Inner Diameters (ID) | 130mm, 150mm, 170mm, 260mm |
Applicable Cable Voltage | 35kV, 110kV, 220kV |
Lateral Compression Strength | ≥ 8 tons |
Lateral Impact Resistance | 100 Nm |
Breaking Bending Pull Force | 1 ton |
Design Service Life | ≥ 25 Years |
Why Choose Philson?
Philson is a global leader in polyurethane subsea solutions. Our expertise is backed by years of R&D and a proven track record of supplying major offshore projects across North America, Europe, and South America. We don't just sell products; we deliver validated engineering security for your subsea infrastructure. [Contact Philson Engineering Team]
