Saudi Aramco needed to protect hundreds of feet of new 24” pipeline during the HDD pull back which would pass through aggressively rocky terrain that could possibly damage the pipe’s coated surface and cause premature coating failure.
The owners turned to NRI’s Scar-Guard to protect the pipeline, not only during the pull, but in-service, as well. And the installation process wasn’t the only harsh condition on the job. Although crews began work in May, work was mainly performed at night when temperatures typically only reached 110°F (43°C). Mobile tents were also erected to protect the freshly coated and wrapped pipes from the dust and sand blown by the heavy desert winds.
First the pipe’s surface was prepped with a sweep blast to roughen the factory-applied fusion-bonded epoxy coating. The joint welds were power tool cleaned to remove excess rust, dirt or loose scale then the pipe was solvent leaned. Next the welds were coated with Syntho-Poxy HC, a two-component, anti-corrosion epoxy filler. Then the primer-coat of Scar-Guard Epoxy was applied at 100-200 microns around the entire circumference to seal the surface of the pipe and provide a bond for the composite system. While the Scar-Guard Epoxy was still wet, the crew applied the Scar-Guard composite system in a clockwise manner and quickly covered with compression film. After curing, the film was removed and thickness and hardness tests performed.
Approximately 12 hours after the composite system application, the pipe was ready for pull back. The new pipeline was successfully installed without scarring and is now protected, thanks to NRI’s Scar-Guard.