Thermo-Wrap Inspectable Restores Corroded Gas Line

QATAR

Pipe Details


  • 152.4-mm (6-inch) gas line experienced corrosion
  • 7-m (23-ft) section of damaged pipe
 

Summary


  • 4-mm (6-inch) gas line experienced corrosion over a 7-m (23-ft) section
  • Thermo-Wrap Inspectable restored integrity to the damaged line
  • 6 trained and qualified technicians repaired the damage
  • No hot work
  • No disruption to operations
  • No environmental impact

When inspections revealed damage on buried gas pipelines in Colombia, the pipeline owner began looking for a solution that could be used to repair the lines without disrupting service and that would be reliable enough to restore line integrity for safe gas transmission for 20 more years.

The owner needed a solution that could be applied to two lines with different diameters, operating under a design pressure of 75.8 bar (1,100 psi) and a design temperature of 25°C (77°F). A 50.8-mm (2-inch) diameter line had experienced wall loss up to 51% over a straight run of 1.8 m (6 ft). The other line was 114.3 mm (4.5 inches) in diameter and had suffered from external corrosion resulting in similar wall loss over a length of 2 m (6.56 ft) that extended along a straight run and an elbow. The ideal repair would have to be appropriate for both the straight pipe and the elbow and would be able to be applied in tight conditions.

Inspections at a fertilizer plant in Qatar revealed a gas line in need of immediate repair. Internal corrosion had damaged a 7-m (23-ft) section of a 152.4-mm (6-inch) line in a location that posed access challenges.

Experience with several solution providers in the region had revealed poor chemical compatibility on previous projects, and the owner had sourced better repairs from CSNRI. Over the course of four years, CSNRI successfully addressed a range of integrity issues and had established a track record for providing a swift response and superior solutions.

Based on engineering and qualification testing, CSNRI determined that the Thermo-Wrap™ Inspectable system was the most appropriate solution for the corroded line. Thermo-Wrap Inspectable is a custom engineered repair system that uses a fiberglass, composite-reinforced coating to deliver high strength characteristics. It is used routinely in chemical processing lines to repair corroded or damaged piping with harsh chemical services.

Thermo-Wrap Inspectable is a custom engineered repair system that uses a fiberglass, composite-reinforced coating to deliver high strength characteristics.
Technicians applied Thermo-Wrap Inspectable to the full length of the damaged line.

With the repair designed, a team of trained and qualified installers from a local contractor arrived on site and began preparing the pipe surface for the composite system installation. Once the pipe surface was ready, the technicians applied Thermo-Wrap Inspectable to the full length of the damaged line, rapidly completing the repair.

Using no special equipment, the team delivered a fast and reliable composite repair without introducing hot work, taking the line out of service, or disrupting operations. Once again, CSNRI designed a reliable composite solution that addressed the owner’s asset integrity challenge without negatively impacting productivity.