The SISeal™ ROV installed J-Tube Seal provides a field proven solution for providing a permanent seal between an existing j-tube and the newly installed riser / umbilical / cable to provide an annulus which can be treated with corrosion inhibitor and maintain an over pressure.
Over 40 J-Tube Seal Assemblies have been installed worldwide.
The seal assembly is preinstalled onto the riser / umbilical on the vessel by Subsea Innovation service engineers. Hydraulic verification checks are performed pre-dive to ensure successful activation. A heavy duty protection cover is fitted onto the elastomeric seals to give protection to the seal as it is deployed from the vessel.
The pull-in operation pauses just prior to installing the seal into the j-tube and the ROV removes the protection cover.
Following seal installation and riser / umbilical laydown the seal assembly is activated. This can be achieved from the topside by a downline system which integrates via an ROV dual hotstab or alternatively by hydraulic power from the ROV itself. Once activated the hydraulic medium is removed and the seal remains activated via Subsea Innovation's specifically designed mechanical locking nuts.
Using the same activation system a seal verification test is then performed. This test pressurises between the two elastomeric seals to ensure a successful seal has been achieved.
The advantage of this system is that a re-intervention can be performed on the hydraulics should a leak be evident. With other passive systems this is not possible.
The seal assembly is fitted with cathodic protection which is designed for the operating lifetime of the assembly.
All SISeal™ assemblies are designed in house and subjected to a factory acceptance test at Subsea Innovation to a client approved procedure. This test is performed on Subsea Innovation’s J-Tube Seal Simulator. A full representation of the bellmouth and riser / umbilical is manufactured and pull-in tests and activation pressures reproduced.
- Riser / umbilical diameters: 2” to 36”
- Bellmouths: 4” to 48”
- Test pressures: 0 to 20 bar.g
- Seal material: Tekthane
- Activation: hydraulic after riser pull-in
- Installation onto riser: topside
Installation into bellmouth: automatic during riser pull-in