Contour Seals Through-Wall Defect Offshore

West Africa

Pipe Details


  • Large through-wall defect in a 203-mm (8-in) diameter main firewater line

  • 8.17 mm (0.32 in) original wall thickness

Summary


  • Large through-wall defect in a 203-mm (8-in) diameter main firewater line
  • A team of 2 local Clock Spring trained technicians completed the Clock Spring Contour repair in 2 days
  • No hot work was required during the Contour installation
  • The Contour repair ensured that the firewater line would operate safely until the next planned shutdown.

During routine operations on an offshore structure, workers discovered a through-wall defect on the discharge section of the main 203-mm (8-in) firewater line. The reduction in pressure in the line severely impacted the firewater system, resulting in compromised safety and firefighting ability.

Realizing the potential consequences, the operator began looking for a leak repair solution that would allow continued safe operation until the line could be replaced at the next planned shutdown. The answer was Clock Spring Contour, an engineered wet-applied repair system that uses stitched fiberglass cloth applied with filler material and epoxy.

An inspection on an offshore facility revealed a large through-wall defect in a 203-mm (8-in) diameter main firewater line.
An inspection on an offshore facility revealed a large through-wall defect in a 203-mm (8-in) diameter main firewater line.
Clock Spring certified technicians applied filler to the damaged line.
Clock Spring certified technicians applied filler to the damaged line.

When this decision was made, Clock Spring trained and certified installers moved to the installation site to begin the repair. The first step was to remove the coating on the damaged firewater line using power tools. Next, a bristle blaster was applied to produce the required surface profile, equivalent to SA2.5.

With the line properly prepared, a Clock Spring Contour repair, designed in accordance with ISO 24817, was applied to the damaged section of the line. These ISO guidelines provide requirements and recommendations for qualifying, designing, installing, testing and inspecting the external application of composite repair systems to corroded or damaged pipework, pipelines, tanks, and vessels used in the petroleum, petrochemical, and natural gas industries.

For this repair, installers followed the established installation process, applying filler material, followed by epoxy, which allowed the fiberglass patch to restore the line geometry and prevent the glass falling into the hole.

Two installers completed the repair in 2 days, ensuring that the firewater line would be able to operate safely until the next planned shutdown.

The installation was executed without the need for welding or heavy lifting on the work site.

There are nearly 3,000 trained Clock Spring installers around the world who are qualified to provide repairs with Clock Spring products. Clock Spring regularly offers training classes for installers and can custom design training for individual company needs.

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The completed Contour repair ensured the firewater line would be able to operate safely until the next planned shutdown.
The completed Contour repair ensured the firewater line would be able to operate safely until the next planned shutdown.