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I/J-Tube Seal

The inside surface of an I/J-Tube is often difficult to coat with traditional anti-corrosion systems, such as paint or application of anodes, etc. Hence a sealing device is often installed into the bottom of the tube, in order to seal the annulus between the I/J-Tube and the umbilical/flexible pipe and then the annulus is filled with corrosion-inhibited water. EXSTO typically manufactures two different types of I/J-Tube seals:

  • Diver-installed Seal (figure 1).
  • Diverless/Pull-in Seal (figure 2).

Design

All components in both types of seals are manufactured in half shell form for ease of installation and retrofitting. The design can be customised to fit particular in-service and installation requirements. Calculations are performed to estimate amongst others:

  • Clamp analysis/Structural integrity.
  • Seal dimensions/Seal integrity.
  • CP system.
图3

The following parameters (typical) are needed to design an I/J-Tube Seal:

  • Flexible Pipe/Umbilical OD.
  • Pressure/Pull-in load requirements.
  • Design life.
  • Corrosion inhibitor details.
  • Maximum allowable crushing pressure for the flexible pipe/umbilical.
  • I/J-Tube exit details/Installation Method.
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