Njord J-Tube S is used to prevent the loss of corrosion inhibitor solution used in the annulus, fitted between the hostline and the J-Tube bore.
In the subsea environment pipe connections are at risk of corrosion, due to the level of acidity in the water. This corrosion reduces the stability of the pipeline, increasing the likelihood of leakage. Njord J-Tube S (Seal) are used to prevent the loss of corrosion inhibitor solution used in the annulus between the host line and the J-Tube bore.
The seal is secured to the host line by integral clamps. 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.
Polyurethance seal elements are used to provide an interference fit to the host line and the J-Tube bore. The interference fit provides the seal – no subsea activation is necessary.
Njord J-Tube S is primarily used to prevent the loss of corrosion inhibitor within the J-Tube annulus.