NATURE OF DEFECT
The 36” line had suffered from external and internal corrosion. This resulted in local wall thinning. The client required a composite repair to protect the line from further external corrosion and bring the line back up to its full design specification.
SOLUTION
Metalyte Pipeworks produced a repair method using Herculyte epoxies to fill the external defects with a minimum overwrap of 8 layers of Dragon-Q-STD composite system.
REPAIR METHOD
The surface was prepared (excluding the identified defect area) via on site shot blasters to gain a surface profile to Sa 2.5 and any defects within the repair area were repaired using Herculyte resins. 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 8 layers of Engineered Dragon-Q-STD composite and allowed to cure until a minimum of 74.5 “Shore D” hardness was achieved
