Thermo-Wrap Inspectable Restores LNG Plant to Safety

QATAR

Pipe Details


  • An 813-mm (32-inch) diameter line carrying high-BTEX fluid experience internal corrosion
  • 7.5 m (24.6 feet) of the pipe needed to be repaired
  • Design Temperature 156°C (313°F)
  • Operating Temperature 134°C (273°F)
  • Installation Temperature 134°C (273°F)
  • Design Pressure 6.5 bar (94.27 psi)

Summary


  • An 813-mm (32-inch) diameter line carrying high-BTEX fluid experience internal corrosion
  • Thermo-Wrap Inspectable restored integrity to 7.5 m (24.6 feet) of damaged line
  • Trained and qualified technicians repaired the damage
  • No disruption to operations
  • No environmental impact

An LNG plant in Qatar experienced internal corrosion on a line carrying hydrocarbons with a high concentration of benzene, toluene, ethylbenzene, and xylene (BTEX). In total, a length of 7.5 m (24.6 feet) on an elevated 813-mm (32-inch) diameter line required repairs.

The asset owner had used CSNRI solutions for several repairs over the course of four years and wanted to address this specific damage using a suitable and compatible composite system that could address the BTEX properties. Previous experience with other products had not been successful because of poor chemical compatibility. The owner knew that CSNRI could provide a repair with good resistance to high BTEX concentration.

CSNRI experts assessed the damage and prescribed Thermo-Wrap™ Inspectable to restore line safety. Thermo-Wrap Inspectable is a custom engineered repair system that uses a fiberglass, composite-reinforced coating to repair corroded or damaged piping with harsh chemical services and elevated temperatures. It is commonly used on chemical processing lines, flare lines, blowdown lines, and steam piping and because of its flexible properties, is easily applied to girth welds, elbows, tees and other complex geometries.

Thermo-Wrap Inspectable is a custom engineered repair system that uses a fiberglass, composite-reinforced coating to deliver high strength characteristics.
Thermo-Wrap Inspectable is a custom engineered repair system that uses a fiberglass, composite-reinforced coating to deliver high strength characteristics.
Thermo-Wrap Inspectable was applied to an elevated 813-mm (32-inch) diameter line.
Thermo-Wrap Inspectable was applied to an elevated 813-mm (32-inch) diameter line.

With the proper repair designed, a team of trained and qualified technicians from a local contractor arrived on site and began preparing the pipe surface for the composite system installation. The installers grit blasted the pipe to a finish equivalent to SA2.5, removing rust, coating, and mill scale to produce a near-white surface prior to the application of the repair. Once the pipe surface was ready, they applied 21 layers of Thermo-Wrap Inspectable to 7.5 m (24.6 feet) of damaged line.

The entire line was restored without interrupting operations, which allowed the LNG train to continue operating while the repair was being made.