NATURE OF DEFECT
The 8” line had suffered from internal corrosion at the elbow. This resulted in significant wall loss. The client requires a composite repair to account for a through wall defect at that location. Metalyte Pipeworks have produced a repair method using Herculyte epoxies to help mitigate the defects with a minimum overwrap of 18 layers on the 8” and 4 layers on the 32” of Dragon-Q-UHT composite
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies to resolve the defects with a minimum overwrap of 18 layers and 4 layers of Dragon-Q-UHT composite system.
REPAIR METHOD
The substrate was prepared (excluding the identified defect area) using shot blasting to a surface profile of SA2.5.
500 microns of Dragon resin was applied as a bonding coat to the entire repair area prior to applica- tion of the Dragon composite and the repair area was wrapped in 18 layers and 4 layers of engi- neered Dragon-Q-UHT composite system and allowed to cure until a minimum of 74.5 “Shore D” hardness was achieved.
