A J-tube is a conduit that has the shape of the letter “J” that is attached to the platform. J-tube consists of the following components:
  • Vertical Tube
  • Bottom Bend
  • Bell Mouth
It is a common practice in the offshore industry to use J-tube as a method of installation of SMALL diameter flowline, electrical cable or pipeline bundle as connecting a small diameter pipeline to the topside facilities through a small diameter riser is not very convenient in terms of supports. To overcome difficulties of installation and protection, small diameter pipelines / cables are installed by pulling-in through J-tube.

The J-tube pull-in design can be found in the following link:

  1. A. C. Walker & P. Davis, A design basis for the J-tube method of riser installation, Journal of Energy Resources Techonology, ASME, Sept 1983.
  2. Full scale pull-in loads for multiple flowline bundles in North Sea's Troll Field, Oil & Gas Journal, Sept 1985.
  3. http://www.marktool.com/tool-rubber/J-Tubes

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