NATURE OF DEFECT
The 30” line had suffered from external corrosion. This has resulted in a pin hole defect at the 12-o clock position. The client requires a composite repair to seal the through wall defect and bring the line back up to its full design specification.
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies to repair the defects with a minimum overwrap of 4 layers of Dragon-Q-UHT composite system.
REPAIR METHOD
Herculyte epoxies were fully mixed and inserted over the defect. The substrate surface was prepared (excluding the identified defect area) using an MBX machine to gain a surface profile to SSP.SP11. A minimum of 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 4 layers of Engineered Dragon-Q-UHT composite and allowed to cure until a minimum of 74.5 Shore D hardness was achieved.
