The J-Tube seal is designed to centralize and partially seal a cable within the J-Tube riser of an offshore wind structure. It consists of a ductile iron body with flexible polyether ears. The seal is attached to the cable before deployment, enabling diverless installation. While primarily used in the offshore wind industry, it is also suitable for oil and gas structures.
The main purpose of the J-Tube Seal is to stop the loss of corrosion inhibitor from the J-Tube annulus. Integral clamps secure the seal to the host line, allowing it to be pulled into a J- or I-tube. Typically, the seal is positioned inside the J-Tube just behind the entry bellmouth.
In order to achieve an interference fit to the host line and the J-Tube bore, polyurethane seal components are used. There is no need for subsea activation because the interference fit provides the seal.
Key Features of J-tube Seals
• Design life: up to 25 years
• High integrity sealing elements
• Dual seal design allows pressure verification prior to leaving worksite
• Hydraulically activated by ROV or diver
• Easily removed for decommissioning
• Subsea coating system with cathodic protection
• Full in house pressure and slip testing capability
• Established range of standard and quick install bend restrictors available to protect the cable or umbilical on the back end of the J-Tube Seal
With more than 10 years experience in subsea cable protection system, Philson has produced a wide range of cable protection system for offshore wind, oil and gas industry. J-tube seals are critical in maintaining the long-term reliability of subsea installations, ensuring safety and preventing costly failures due to environmental factors or physical damage.
