Njord J-Tube B is used to prevent the loss of corrosion inhibitor solution used in the annulus, fitted between the hostline and the J-Tube bore.
The seal is secured to the host line by an integral clamp. It can then be pulled into the J-Tube or I-Tube with the host line. Typically the seal will be installed in the J-Tube just behind the entry bellmouth. It is installed by diver.
Polyurathane seal elements are used to provide an interference fit to hold the host line and the J-Tube bore. The interference fit provides the seal by diver activation. This means there is no resistance during the flexible or umbilical pull in operation.
J-Tube seals are primarily used to prevent the loss of corrosion inhibitor within the J-Tube annulus.