NATURE OF DEFECT
The 36” line had suffered from internal and some external corrosion. This resulted in a hole & leak at the 6-o clock location on a concrete support pad. The client required a composite repair to seal the leak location and to bring the line back up to its full design specification.
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies and an injectable composite system to seal the leaks with a minimum overwrap of 14 layers of Dragon-Q-STD composite system.
REPAIR METHOD
Epoxies together with an injectable composite system were used to seal the leak location. The surface was prepared (excluding the identified defect area) via grit blasting to gain the required surface profile and 500 microns of Dragon resin was applied as a bonding coat to the entire repair area prior to application of the Dragon composite. The repair area was wrapped in 14 layers of Engineered Dragon-Q-STD composite and allowed to cure until a minimum of 74.5 “Shore D” hard- ness was achieved.
