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J-tube Supports

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To avoid excessive stress on a riser or umbilical at the point where It enters the j-tube, additional support might be required. This can be provided by grout bags, or Subcon’s dedicated J-tube support formwork. The j-tube formwork is designed to reduce installation time and provide support along the riser bend.

For more information, please have a look at the fabric formwork product page.


Our custom J-Tube support bags can either be pre installed on a deployment beam prior to the umbilical pull-in or post installed after pull in.

Depending on the available space for the ROV to work, Subcon can tailor an installation method to suit your needs.

Subcon’s bespoke supports can be designed with elevated shoulders that protect the umbilical from accelerated water velocities at the base of the structure.

This reduces the fatigue in the umbilical in its overall design life.

Our grouted J-Tube supports are custom designed for each application so can be designed with consideration to surrounding infrastructure and seabed configureation.

As water particle velocities are accelerated around the base of offshore structures, the overall stability of the support may be compromised. Subcon has proprietary heavy density grouts that can be pumped into the support formworks to ensure stability throughout its design life.

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