Asset Protection Technology

J-Tube Seals

Tekmar’s J-Tube Seals are engineered to provide secure cable entry sealing, pressure retention and cable centralisation within offshore J-Tube systems. Designed to protect subsea power cables and umbilicals throughout installation and operational life, J-Tube Seals help prevent seawater, sediment and environmental ingress while supporting long-term cable integrity and operational reliability in harsh offshore environments.

Proven J-Tube sealing technology trusted across offshore wind and offshore energy projects worldwide.

Available in active and passive seal configurations, Tekmar’s J-Tube Seals are engineered for efficient offshore installation and can be tailored to accommodate project-specific cable and J-Tube requirements. Acting as a secure interface for bend restrictor trains, the system helps protect cables and umbilicals from excessive bending in free-span environments while integrating seamlessly with Tekmar’s Vertebrae Bend Restrictors (VBR) and wider subsea protection portfolio.

Key Features

Provides cable entry sealing and pressure retention within offshore J-Tube systems
Helps prevent seawater, sediment and environmental ingress to support long-term cable integrity
Centralises subsea cables and umbilicals within the J-Tube structure
Provides a reaction interface for bend restrictor trains to support free-span cable protection
Available in active and passive seal configurations to suit project requirements
Pre-assembled design supports simplified offshore installation and reduced handling time
Engineered for harsh offshore environments and long-term subsea performance
Designed to integrate with Tekmar Vertebrae Bend Restrictors (VBR) and subsea protection systems

Applications

J-Tube Seals support a wide range of offshore infrastructure applications, including:

Offshore wind monopile and jacket foundations
Offshore oil & gas platforms and subsea structures
Export and inter-array cable entry systems
Umbilical and subsea cable sealing applications
Fixed-bottom offshore infrastructure projects

Proven Track Record

Tekmar’s J-Tube Seals have been successfully deployed across offshore wind and offshore energy projects worldwide, supporting developers, EPCs and contractors with secure, reliable cable entry sealing solutions for demanding offshore environments.

Backed by decades of offshore engineering expertise and integrated subsea protection capability, Tekmar helps customers safeguard cable integrity, reduce maintenance requirements and improve long-term offshore asset performance.

Associated Products & Services